Display device and composite display device

FIELD: physics.

SUBSTANCE: display device has a substrate; a pixel electrode placed on the substrate; an insulating dividing wall between pixel electrodes which forms divided regions on the pixel electrodes; an inorganic luminescent layer having its lower surface in contact with the pixel electrode and placed in the region separated by the dividing wall; an opposite electrode placed on the inorganic luminescent layer; and a thin-film transistor which in its conducting state applies voltage between the pixel electrode and the opposite electrode and causes the inorganic luminescent layer to emit light. The composite display device is realised using the said device.

EFFECT: control of thin-film transistors using an inorganic electro-luminescent element which emits light at low voltage.

11 cl, 6 dwg

 

The technical field

The present invention generally relates to the technical field of flat display devices, and more specifically to a display device using an inorganic fluorescent layer.

The level of technology

Currently developing a display device or a light-emitting device using an organic electroluminescent (EL) element.

However, when the organic ELECTROLUMINESCENCE element is an organic material, there is a problem, which consists in the fact that this material is deteriorating due to moisture or the like and has a short service life. In addition, due to the instability of the damage to the organic layer of the organic EL element cannot be deposited by sputtering; and besides it is difficult to use a sputtering method to form a film on this organic layer.

In addition, when the panel is made of a color display, it is necessary to form organic films of different materials corresponding to the three colors; and it is difficult to increase the size of the area, and there is also the problem consists in the fact that the display device becomes expensive.

The inorganic material used for the inorganic EL element is superior to the material of the organic EL element is due to a longer service life. In addition, inorganic EL element allows you to choose many kinds of ways deposition (such as sputtering or the like) due to their resistance to damage and allows you to easily deal with large-sized substrate.

However, conventional inorganic EL element must be applied with a voltage of about 100 for light emission and cannot be controlled by the circuit (such as thin-film transistor or the like).

Although there is a disclosure document that was produced display using inorganic EL element, controlled thin-film transistor, for this display requires a high voltage, and therefore mass production technology has not yet been implemented; and, thus, the inorganic EL element has not been used for high resolution display or the like.

Recently developed inorganic EL material that is capable of emitting light at a lower voltage than in the conventional technology (patent document 1). More precisely, it is known that inorganic EL material containing ZnS, emits light with high luminance at a voltage of a few volts (less than ten volts), and it is expected that this material will provide the ability to control light emission of a thin-film implemented the torus due to the low voltage; and it is also expected that the device is a color display using the white inorganic EL element and a color filter will be mass produced due to high brightness.

Patent document 1: JP-A2005-336275

Disclosure of inventions

Objectives of the invention

The present invention provides a display device and the display, allowing the control TFT (thin film transistor)using an inorganic EL element that emits light at a low voltage.

A means to solve problems

To solve the above-discussed problems, the display device according to the present invention has a substrate and a pixel electrode located on the substrate, the inorganic luminescent layer located on the pixel electrode, an opposite electrode located on the inorganic luminescent layer, and a thin-film transistor, which applies the voltage between the pixel electrode and the opposite electrode and encourages inorganic luminescent layer emitting light in its conducting state.

In addition, in the display device in this implementation variant, the substrate and the pixel electrode are transparent and fluorescent light emitted from the inorganic luminescent layer, passes through the pixel power and the substrate, to be emitted outward.

In addition, the display device in this implementation variant includes a color filter located in the location where the emitted fluorescent light passed through the substrate.

In addition, in the display device in this implementation variant of the opposite electrode is transparent and fluorescent light emitted from the inorganic luminescent layer, passes through the opposite electrode to emit outward.

In addition, the display device in this implementation variant includes a color filter located in the location where the emitted fluorescent light passed through the opposite electrode.

In addition, in the display device in this implementation variant inorganic luminescent layer contains, for example, zinc sulphide.

The composite display device according to this implementation variant includes a first pixel electrode, the first inorganic luminescent layer, the first opposite electrode and the first thin film transistor located on one surface of the substrate, and the second pixel electrode, the second inorganic luminescent layer, the second opposite electrode and the second thin film transistor located at the above another surface of the same substrate, moreover, the substrate, the first and second pixel electrodes, the second opposite electrode are transparent. When the first and second thin film transistors are in a conducting state between the first pixel electrode and the first opposing electrode and between the second pixel electrode and the second opposite electrode applied voltage; and first and second inorganic luminescent layers respectively emit light; a second inorganic luminescent layer is in the same location as the first inorganic luminescent layer, right behind him, fluorescent light of the first inorganic luminescent layer passes through the first pixel electrode substrate and the second pixel electrode in this order, in order to be transmitted on the second inorganic luminescent layer, and further passes through the second inorganic luminescent layer and the second opposite electrode to emit to the outside; and fluorescent light of the second inorganic luminescent layer passes through the second opposite electrode to emit outward.

In addition, the composite display device according to this implementation variant includes a color filter is placed in the location where the emitted fluorescent light is rousey through the second opposite electrode.

In addition, in the composite display device according to this implementation variant of the first and second inorganic luminescent layers contain, for example, zinc sulphide.

The result of inventions

It is expected that the inorganic luminescent material is resistant to damage and will have a long lifetime compared to the organic luminescent material.

Inorganic luminescent layer can be formed by a sputtering method.

An opposite electrode formed on the inorganic luminescent layer can be formed by a sputtering method.

Inorganic luminescent layer can be actuated at low voltage, and the emission of the light can be adjusted thin-film transistor.

In addition, since the inorganic luminescent layer is heat-resistant, the display device of the type with radiation from below (from the English. "bottom-emission type display device") and a display device of the type with radiation from above (from the English. "top-emission type display device") can be placed on the same substrate, and emitted their light may overlap.

Using containing the zinc sulfide film for inorganic luminescent layer, it is possible to obtain a high brightness, and the light emission of a relatively low voltage of 10 V or less.

Brief description of drawings

Figure 1 - schematic representation for illustrating the display device of the type with radiation from below of the number of display devices in this implementation variant.

Figure 2 - schematic representation for illustrating the display device of the type with radiation from the top of the number of display devices in this implementation variant.

Figure 3 - schematic representation to illustrate the composite display device according to this implementation variant.

4 is a top view for illustrating the internal structure of the display device in this implementation variant.

Figure 5(A) is an example of the exciting circuit for a display device according to this variant implementation, and figure 5(B) is an example of the exciting circuit for the liquid crystal display device.

Explanation of reference numbers

11, 21 of the display device

31 composite display device

100, 111, 211 of the substrate

105, 205, the control transistor

118, 218 pixel electrode

121, 221 inorganic luminescent layer

123, 233 opposite electrode

141, 241, 341 color filter

The best ways of carrying out the invention

Embodiment will be described with reference to an active matrix type TFT for a display device with liquid crystal or organic EL element.

Reference numbers 11 and 21 in figure 1 and figure 2 show the use of the s of the display devices according to the present invention. The display device 1 is a device type with radiation from below; and the device 21 display figure 2 is a device type with radiation from above. TFT can be formed of monocrystalline silicon, amorphous silicon or polysilicon.

These devices 11 and 21 display includes a substrate 111 and 211, respectively, on the substrate 111 and 211 respectively formed insulating film 112 and 212; and on each of the insulating films 112 and 212 are made of one or more thin-film transistors (TFT).

Among these thin-film transistor, the control transistor is specified designations 105 or 205 figure 1 or 2.

On the control transistor 105, 205 of the first insulating film 114, 214; and on the surface of the first insulating film 114, 214 posted by structured electrode 116s, 216s source and structured electrode 116d, 216d flow.

The control transistor 105, 205 includes electrode 131, 231 of the gate insulating film 132, 232 of the gate and the semiconductor layer 133, 233. The insulating film 132, 232 shutter placed between the electrode 131, 231 of the gate and the semiconductor layer 133, 233.

On the semiconductor layer 133, 233 in its both end positions respectively placed Itokawa region 134s, 234s and a drain region 134d, 234d, which have a conductivity type opposite to the semiconductor SL is Yu 133, 233.

The electrode 116s, 216s source and the electrode 116d, 216d drain connected to stokovoj region 134s, 234s and a drain region 134d, 234d, respectively.

The control transistor 105, 205 is configured as follows: when voltage is applied to the electrode 131, 231 of the shutter, as described later, the semiconductor layer 133, 233 is formed facing layer; Itokawa region 134s, 234s and a drain region 134d, 234d are connected through this facing layer; and then the control transistor 105, 205 becomes conductive.

On the electrode 116d, 216d flow and the electrode 116s, 216s source is the second insulating film 117, 217; and on the second insulating film 117, 217 are many structured pixel electrodes 118, 218.

Here, the second insulating film 117, 217 sealed conductive connector 119, 219; and the electrode 116s, 216s source and the pixel electrode 118, 218 are electrically connected to each other with this connector 119, 219.

Between the pixel electrodes 118, 218 formed insulating dividing wall 122, 222 to separate each of the pixel electrodes 118, 218, and in the field, separated by a dividing wall 122, 222, posted by the inorganic luminescent layer 121, 221. The bottom surface of the inorganic luminescent layer 121, 221 is in contact with the pixel electrode 118, 218.

On the surface of the inorganic layer 121, 221 is placed against apology electrode 123, 223; and the surface of the opposite electrode 123, 223 are additional protective film 124, 224. The surface of the inorganic luminescent layer 121, 221 is in contact with the opposite electrode 123, 223.

In the display device 11 of the type with radiation from below in figure 1 on the rear surface of the substrate 111 is placed a color filter 141; and the device 21 display type radiation from the top in figure 2, a color filter 241 is located on the opposite electrode 223.

A color filter 141, 241 includes a transmissive portion 142, 242, corresponding to R, G and B (R, G, and B denote, respectively, red, green, and blue), and Svetozara black matrix 143, 243, placed between the transmissive parts 142, and the light passed through the adjacent transmissive portion 142, 242, configured to not be mixed up together and have only one color among R, G and B.

In the display device 11 of the type with radiation from below not only the substrate 111, but materials placed between the inorganic luminescent layer 121 and the lower substrate 111, such as a pixel electrode 118 and the first and second insulating films 114 and 117 or the like, are transparent. When voltage is applied to the inorganic luminescent layer 121 and the luminescent layer 121 emits light, the emitted light passes through these materials (such the AK pixel electrode 118 or the like) and the substrate 111 under the bottom of the inorganic luminescent layer 121, to be emitted into the back side of the substrate 111.

Fluorescent light emitted to the rear side of the substrate 111, passes through the transmissive part color filter 142 141 and dyed any of R, G and B.

In the device 21 display type radiation from the top in figure 2 materials on the upper side of the inorganic fluorescent layer 221, such as the opposite electrode 223 and the protective film 224, have transparency; and fluorescent light emitted from the inorganic fluorescent layer 221, passes through the opposite electrode 223 or the like, to be emitted to the outside. In the device 21 display type radiation on top of the fluorescent light is not passed through the substrate 211.

As in the case of the display device 11 with radiation from below, the fluorescent light passed through the opposite electrode 223 and emitted to the outside, passes through the transmissive portion 242 of the color filter 241 to appear in any of the R, G and B.

Figure 4 is a schematic top view to illustrate the interior of the device 11, 21 display, and formed line of LSsweep and line LDdata, which are formed of metal films (string Lddsupply voltage in the drawing is omitted). Line LSsweep and line LDdata composed fresedo on the substrate 111, 211.

Reference number 310 denotes a pixel region surrounded by the lines LSscan and rows LDdata; and numerous areas 310 pixels arranged in a matrix on the substrate 111, 211. Within each area 310 pixels posted a pixel portion 301, which is inorganic luminescent layer 121, 221, and the circuit part 302, where the circuit for controlling light emission.

Figure 5(a) is a schematic diagram of a circuit that controls a device 11, 21 display on this implementation variant, and here shows a diagram of the type excitation constant current which applies the voltage of the DC power supply Vdd(DC) to the inorganic luminescent layer 121, 221 to emit light.

Circuit part 302 includes the above-mentioned control transistor 105, 205, diffusion capacity 322 and transistor 321 of the sample.

The source electrode of the control transistor 105, 205 is connected to the pixel electrode 118, 218. The pixel electrode 118, 218 is in tight contact with one side surface of the inorganic luminescent layer 121, 221 and the opposite electrode 123, 223 is in tight contact with the other side surface of the inorganic luminescent layer 121, 221. The opposite electrode 123, 223 is connected to the ground potential.

The electrode hundred the and of the control transistor 105, 205 is connected to the line Lddsupply voltage, and a gate electrode connected to the line LDdata through the transistor 321 of the sample. The output of the transistor 321 of the sample is connected to the line LSscanner, and the gate electrode of the control transistor 105, 205 is connected to the line LDdata, when the transistor 321 of the sample becomes conductive according to the polarity or amplitude of gate voltage applied to the line LSthe sweep. When the transistor 321 sampling is turned off, the gate electrode of the control transistor 105, 205 is disconnected from the line LDdata.

When the gate electrode is connected to the line LDdata, the control transistor 105, 205 becomes conductive or off according to the polarity or amplitude of the voltage on the line LDdata.

When the control transistor 105, 205 becomes conductive, the pixel electrode 118, 218 is connected to the line Lddsupply voltage, and inorganic luminescent layer 121, 221 applied voltage Vddpower for light emission.

Diffusion capacity 322 is connected between the gate electrode and the drain electrode of the control transistor 105, 205, and diffusion capacity of 322 charging voltage line LDdata connected to the gate electrode, when the control transistor 105, 205 on titsa in a conducting state.

When the transistor 321 sampling is turned off in this state, the control transistor 105, 205 is held conductive by the charging voltage of the diffusion capacitance 322.

After the voltage line LDdata was changed in polarity and magnitude to turn off the control transistor 105, 205, when the transistor 321 becomes conductive, and the gate electrode of the control transistor 105, 205 is connected to the line LDdata, the control transistor 105, 205 is turned off and simultaneously charging voltage of the diffusion capacitance 322 is discharged, and the light emission is terminated.

Figure 5(b) shows the circuit for a liquid crystal display device in which the capacitance CLliquid crystal, which is the equivalent circuit of a liquid crystal, is connected to the ground potential at one end and connected to the line LDdata on the other end through the transistor Tr of the sample.

The capacity CLliquid crystal is connected in parallel with the diffusion capacity of Cst.

Electrode of the transistor Tr connected to the sampling line LSthe sweep. The capacity CLliquid crystal and diffusion capacity Cstconfigured to be charged or discharged together, when the transistor Tr of the sample becomes conductive.

Although filepriv the given example, the diffusion capacity of 322 in this implementation variant connected between the gate electrode and the drain electrode of the control transistor 105, 205, diffusion capacity of 322 may be connected between the output of the transistor 321 sampling and ground potential, as in the case of the liquid crystal display device.

Inorganic luminescent layer 121, 221, used in this embodiment is superior in respect to the luminescent layer of an organic compound (organic EL layer) for the reason that inorganic luminescent layer does not undergo deterioration in luminance or thermal decomposition, even when heated to high temperature. Accordingly, even when the additional inorganic luminescent layer is further formed after it was formed one inorganic luminescent layer, formed earlier this inorganic luminescent layer does not deteriorate under the action of heat during the formation of subsequent inorganic luminescent layer, and can accumulate many layers of the inorganic fluorescent layer and to form additional luminescent layer on the other side of the substrate after the inorganic luminescent layer was formed on one side of the substrate.

Reference number 31 figure 3 represents a composite display device in this implementation variant. In this composite device 31 to display the same elements, as figures 1 and 2, denoted by identical reference number, and their description is omitted. Composite device 31 display includes inorganic luminescent layers 121 and 221, respectively on one side and the opposite side of the substrate 100 having transparency. Of these inorganic luminescent layer 121 and 221 one inorganic luminescent layer 121 is a device 331 type display with radiation from the bottom on one side of the substrate 100, and the other inorganic luminescent layer 221 is device 322 type display with radiation from the top on the other side of the substrate 100.

In addition to the General use of the substrate 100, the other elements are the same as those in the device 11, 21 display, shown in figure 1 and 2, but in this composite device 31 of the display pixel electrode 218 device 332 type display with radiation from the top is made of a transparent conductive film, and the substrate 100 is transparent, whereas in the device 21 display type radiation from the top in figure 2, the pixel electrode 218 is not necessarily transparent.

Fluorescent light emitted from the inorganic luminescent layer 121 device 331 type display with radiation from the bottom, passes through the inside of the device 331 type display with radiation from below the substrate 100, the pixel electr the d 218 device 332 type display with radiation from above, reaches the inorganic fluorescent layer 221 device 332 type display with radiation from above and passes through the inorganic luminescent layer 221 and the opposite electrode 223 to be emitted outward.

That is, the fluorescent light emitted from the device 331 type display with radiation from the bottom, passes through the inside of the device 332 type display with radiation from the top, to emit outward.

Fluorescent light emitted from the inorganic fluorescent layer 221 device 332 type display with radiation from above, passes through the opposite electrode 223 inside device 332 type display with radiation from the top, to emit outward.

Thus, as in the composite device 31 is displayed on figure 3 fluorescent light device 331 type display with radiation from below is also emitted from the location where it is emitted fluorescent light device 332 type display with radiation from the top, fluorescent light with simultaneous emission has summarized the amount of light and high brightness.

A color filter 341 is placed on the surface of the device 332 type display with radiation from above.

A color filter 341 also includes a transmissive portion 342 of the R, G and B and the black matrix 343, similar to that discussed above in C is Etowah filters 141, 241. A transmissive portion 342 is placed in locations where it comes fluorescent light emitted from the composite display device 31, and this fluorescent light is colored by any of the R, G and B after he was passed through the transmissive portion 342.

If the device 331 type display with radiation from below and device 332 display with radiation from top to emit light alternately, the time of emission for each of the inorganic luminescent layer 121 and 221 becomes shorter, and their life becomes longer.

In the composite device 31 to display the inorganic luminescent layer 121 device 331 type display with radiation from the bottom may be formed first, and inorganic fluorescent layer 221 device 332 type display with radiation from above can be formed later, or they may reverse the sequence.

In addition, the device 331 type display with radiation from below and device 332 type display with radiation from above can be formed separately and then glued to each other.

Each of these transistors may be formed using a crystalline silicon in addition to polycrystalline silicon and amorphous silicon.

Inorganic luminescent layer 121, 221 can be formed in any way nab the population, any way of evaporation, but for large substrates suitable sputtering method. In addition, the inorganic luminescent layer 121, 221 can be formed by coating and drying or coating, drying and firing the inorganic luminescent material.

Inorganic luminescent layer 121, 221 is stimulated to emit light by applying voltage Vddthe DC in each of the above cases, but for the emission of light can be applied and the voltage of an alternating current (AC), because the emission of regulated thin-film transistor.

1. A display device, comprising:
substrate;
a pixel electrode provided on the substrate;
insulating separation wall, which is placed between the pixel electrodes and forms a separated region on the pixel electrodes;
inorganic luminescent layer with its bottom surface in contact with the pixel electrode and placed in the field, separated by a dividing wall;
the opposite electrode, placed on the inorganic luminescent layer; and
thin-film transistor in its conducting state applies the voltage between the pixel electrode and the opposite electrode and encourages inorganic luminescent with the Oh emitting light.

2. The display device according to claim 1, in which the substrate and the pixel electrode have transparency, and fluorescent light emitted from the inorganic luminescent layer, passes through the pixel electrode and the substrate to be emitted outward.

3. The display device according to claim 2, in which the location where the emitted fluorescent light passed through the substrate placed a color filter.

4. The display device according to claim 1, in which the opposite electrode is transparent and fluorescent light emitted from the inorganic luminescent layer, passes through the opposite electrode to emit outward.

5. The display device according to claim 4, in which the location where the emitted fluorescent light passed through the opposite electrode, placed a color filter.

6. The display device of claim 1, wherein the inorganic luminescent layer contains zinc sulphide.

7. The composite display device, comprising:
substrate;
the first pixel electrode on one surface of the substrate;
the second pixel electrode, placed on top of the other surface of the substrate;
insulating separation wall for separating the first and second pixel electrodes, which are placed between the first and between the second pixel the mi electrodes and forms a separated region on the first and second pixel electrodes;
the first inorganic luminescent layer with its bottom surface in contact with the first pixel electrode and placed in the field, separated by insulating dividing wall;
the second inorganic luminescent layer with its bottom surface in contact with the second pixel electrode and placed in the field, separated by insulating dividing wall;
the first opposite electrode placed on the first inorganic luminescent layer;
the second opposite electrode placed on the second inorganic luminescent layer;
the first thin-film transistor in its conducting state applies the voltage between the first pixel electrode and the first opposite electrode, and causes the first inorganic luminescent layer to emit light; and
the second thin-film transistor in its conducting state applies the voltage between the second pixel electrode and the second opposite electrode, and causes the second inorganic luminescent layer to emit light,
thus: a substrate, first and second pixel electrodes and the second opposite electrode have transparency,
the second inorganic luminescent layer is located directly behind the location of the first inorganic is luminescence layer,
fluorescent light of the first inorganic luminescent layer passes through the first pixel electrode substrate and the second pixel electrode in this order, in order to be transmitted on the second inorganic luminescent layer, and then passes through the second inorganic luminescent layer and the second opposite electrode to emit out, and
fluorescent light of the second inorganic luminescent layer passes through the second opposite electrode to emit outward.

8. The composite display device according to claim 7, in which the location where the emitted fluorescent light passed through the second opposite electrode, placed a color filter.

9. The composite display device according to claim 7, in which the first and second inorganic luminescent layers contain zinc sulphide.

10. The display device according to claim 1, in which between the pixel electrode and the opposite electrode is applied a DC voltage.

11. The composite display device according to claim 7, in which between the first pixel electrode and the first opposite electrode is applied a DC voltage, and between the second pixel electrode and the second opposite electrode is applied a DC voltage.



 

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1 cl, 1 dwg, 6 ex

FIELD: physics.

SUBSTANCE: display device has a substrate; a pixel electrode placed on the substrate; an insulating dividing wall between pixel electrodes which forms divided regions on the pixel electrodes; an inorganic luminescent layer having its lower surface in contact with the pixel electrode and placed in the region separated by the dividing wall; an opposite electrode placed on the inorganic luminescent layer; and a thin-film transistor which in its conducting state applies voltage between the pixel electrode and the opposite electrode and causes the inorganic luminescent layer to emit light. The composite display device is realised using the said device.

EFFECT: control of thin-film transistors using an inorganic electro-luminescent element which emits light at low voltage.

11 cl, 6 dwg

FIELD: chemistry.

SUBSTANCE: electroluminescent device has a hole injection layer, a hole transport layer, an active luminescent layer based on electroluminescent substance of formula I , a hole blocking layer, an electron transport layer and an electron injection layer.

EFFECT: high luminance of devices emitting in the green spectral region.

1 ex

FIELD: physics.

SUBSTANCE: luminophore consists of crystal lattice of seed material with activating additives representing ions Eu2+, Tb3+ and/or Eu3+. Said seed material, when excited by high-energy excitation radiation, absorbs at least portion of said excitation radiation to, then, emit radiation with lower power. Note here that seed material lattice represents carbide-silicon nitride compounds not containing cerium as activating additive. Invention covers also luminophore with its seed material lattice represents compound with general formula Ln2Si4N6C, where Ln stands for element or mix of elements selected from group including yttrium, lanthanum, gadolinium and lutetium.

EFFECT: reduced tendency to luminescence quenching, higher temperature and chemical stability.

11 cl, 6 dwg, 4 ex

FIELD: physics.

SUBSTANCE: electroluminescent device (9) for emitting light (7) whose colour point can be set variably, has at least two electroluminescent regions (41, 42) which, to allow application of the same operating voltage, are arranged to be connected in parallel electrically. The electroluminescent regions (41, 42) contain at least one first electroluminescent region (41) of a first electroluminescent material for emitting light in a first spectral band in accordance with a first luminance versus voltage characteristic (81), and at least one second electroluminescent region (42) of a second electroluminescent material for emitting light in a second spectral band which is not the same as the first spectral band, in accordance with a second luminance versus voltage characteristic (82) which is not the same as the first luminance versus voltage characteristic (81).

EFFECT: simple electroluminescent device which provides a controlled colour point and brightness.

10 cl, 10 dwg

FIELD: chemistry.

SUBSTANCE: red light emitting material has the formula M1-yA1+xS4-xN7-x-2yOx+2y:RE, where M is selected from a group comprising Ba, Sr, Ca, Mg or mixtures thereof, A is selected from a group comprising Al, Ga, B or mixtures thereof, RE is selected from a group comprising rare-earth metals: Y, La, Sc, Eu, Ce or mixtures thereof, x≥0 and ≤1, y≥0 and ≤0.2. Doping level ≥0.5% and ≤10%; photostability ≥80% and ≤90%. A light-emitting device contains said luminescent material in form of powder or ceramic material. The powder has d50≥5 and ≤15 mcm. The ceramic material has ≥90% of theoretical density.

EFFECT: luminescent material has high quantum efficiency, luminous efficacy and colour rendition.

10 cl, 6 dwg, 4 tbl, 2 ex

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