Luminophor for light sources

FIELD: physics, optics.

SUBSTANCE: invention relates to photoluminophors designed for converting emission of blue light-emitting diodes to the yellow-red region of the spectrum in order to obtain resultant white light, particularly to a cerium doped luminophor based on yttrium aluminium garnet used in two-component light-emitting diode light sources. The invention describes a luminophor for light sources which contain aluminium, yttrium, cerium, lutetium and oxygen in the following ratio: (Y1-xCex)3Al5O12 and 5-60 wt % over 100% (Lu1-yCey)2O3, where x=0.005-0.1; y=0.01-0.1. The invention provides a fine-grained luminophor with luminescent emission band maximum at λ≈590 nm, while lowering temperature and duration of synthesis.

EFFECT: use of such a luminophor in a two-component light source with a blue light-emitting diode enables to obtain resultant "warm" white light with high colour rendering index, increases uniformity of light scattering and reduces energy consumption during synthesis.

1 cl, 1 dwg, 6 ex


The invention relates to photoluminous serving to convert the blue light LEDs in the yellow-red region of the spectrum with the aim of obtaining the result of white light. In particular, legirovannom cerium the phosphor on the basis of yttrium-aluminum garnet used in two-component led light sources.

Known prepared by Sol-gel method, the phosphor composition (Lu1-xCex)3Al5O12where x=0,003-0,015 (H.-L.Li, X.-J.Liu, L.-P.Huang. "Luminescent properties of LuAG:Ce phosphors with different Ce contents prepared by a sol-gel combustion method". Optical Materials (2007), vol.29, p.1138-1142). The disadvantages of the known phosphor are relatively short position of luminescence band (the wavelength corresponding to its maximum, λmax≈505 nm) and a small half-width of this band (Δλ≈80 nm, Δν≈2900 cm-1). These shortcomings do not allow to get from the two-component light source comprising a blue led (λ≈450 nm) and well-known phosphor, the resulting "warm" white light.

Famous yellow phosphor composition (Gd1-xTbx)3(Ga1-yQy)2Al3Oz:aCe3+bB3+where Q is one or more elements selected from the group consisting of Si, Al and Sc; 0≤x≤0,1; 0<y<0,5; z=12 when y=0 or Q is one or more elements selected from the group of Si, Al and Sc, or 12+y where Q=Si; a=1-10 mol.% (Gd, Tb); the b=0.5 to 4 mol per 1 mol of the composition of the medium-host ("Yellow Phosphor and White Light Emitting Device Comprising it". WO 2007/018345 A1, 15.02.2007, IPC: C09K 11/80). The main disadvantage of this phosphor is relatively short position of luminescence band (λmax≈540 nm) and correspondingly low share of quanta emitted in the yellow-red region of the spectrum that does not allow you to get from the two light source result "warm" white light.

Famous yellow phosphor composition of Ca1-xAlSi4N7:Euxwhere to 0.001<x≤0,15 ("Yellow Light-Emitting Phosphor, White Light-Emitting Device Using the Same and Lighting Unit Using the Same", JP 2007169428, 05.07.2007, IPC: C09K 11/64; C09K 11/08; H01L 33/00; C09K 11/64; C09K 11/08; H01L 33/00). The main disadvantage of this phosphor is low half-band luminescence: Δλ≈80 nm, Δν≈2450 cm-1that is not possible to obtain from the two light source resulting white light with high color rendering index.

Closest to the claimed phosphor on the technical nature of a phosphor for light sources composition (Tb1-x-yRExCey)3(Al,Ga)5O12where RE=Y, Gd, La and/or Lu; 0≤x≤0,5-y; 0<y<0,1 ("Phosphor for Light Sources and Associated Light Source". US Patent 7063807 B2, 20.06.2006. IPC: H05B 33/14, 33/00). The disadvantages of the prototype are relatively short wavelength position of the maximum bandwidth of its luminescence (λmax≈550-575 nm), low value half-width of this band (λ≈117-129 nm) and high temperature is round and the duration of the synthesis (T=1450-1550°C and t=6 hours). These disadvantages limit the possibility of obtaining from the two light source resulting warm white light with high color rendering index, is the cause of high energy consumption of synthesis and not allow to obtain highly dispersed phosphor.

The task of the invention is the creation of highly dispersed phosphor with the position of the maximum of luminescence band at λ≈590 nm and decrease the temperature and duration of its synthesis. Using such a phosphor in a two-component source lighting with blue led will get the result "warm" white light with high color rendering index, to improve the uniformity of light scattering and reduce the energy of synthesis.

To solve this task, the phosphor for light sources containing aluminum, yttrium, cerium, lutetium and oxygen, contains these components in the following ratio: (Y1-xCex)3Al5O12and (5-60 wt.% in excess of 100%) (Lu1-yCey)2O3where x=0.005 to 0.1; y=0.01 and 0.1.

The proposed phosphor was prepared as follows.

Water 0.1m solutions of nitrate salts of yttrium and aluminum were mixed in accordance with the stoichiometry, was added a portion of Ce(NO3)3in necessary relation to the substituted ion Y3+and slowly laid siege MMA is ACOM with constant stirring to pH=7.5-8. The precipitate was washed with distilled water until pH 7.0 and were added in the form of an aqueous suspension of finely dispersed Lu2O3activated ions CE3+. The resulting mixture was stirred, the precipitate was separated by centrifugation, dried and thermoablative initially in air at T≈900°C for 2.5 hours, and then reducing conditions at T≈1000°C for 1 hour.

The use of colloid-chemical method of obtaining the proposed phosphor provides high uniformity and small size of the formed particles (the overwhelming proportion of these particles has a size of about 80 nm), which allows to significantly reduce the temperature and duration of heat treatment in comparison with the prototype.

The reduction in the proposed phosphor concentration (Lu1-yCey)2O3below the claimed does not provide a substantial increase in the spectrum of the luminescence share "red" quanta compared with (Y1-xCex)3Al5O12and the increase of this concentration in excess of the claimed leads to a significant decrease in the quantum yield of luminescence. The decrease in the concentration of Ce below the claimed impractical because of the low luminescence intensity, and its increase above declare that due to the weak luminescence in the concentration quenching.

The composition of the proposed phosphor, the width of luminescence band (Δλ) and wavelength (λmax)corresponding to the maximum of this band is shown in the table.

no way-CACompositionΔλeffnmλmaxnm
1(Yof 0.95Ce0,05)3Al5O12+(5 wt.% in excess of 100%) (Luof 0.95Ce0,05)2About3135583
2(Yof 0.95Ce0,05)3Al5O12+(10 wt.% in excess of 100%) (Luof 0.95Ce0,05)2About3140590
3(Yof 0.95Ce0,05)3Al5O12+(50 wt.% in excess of 100%) (Luof 0.95Ce0,05)2About3140590
4(Y0,995Ce0,005)3Al5O12+(50 wt.% in excess of 100%) (Lu0,99Ce0,01)2About3140590
5 (Yfor 0.9Cea 0.1)3Al5O12+(60 wt.% in excess of 100%) (Lufor 0.9Cea 0.1)2About3143593
6The placeholder117-129550-575

The drawing shows normalized to the maximum intensity of the "quantum" time-resolved emission spectra (curve 1) and its excitation (curve 2) sample 3.

It is seen that the proposed phosphor compared to the prototype has a wider band luminescence and more far-position of its maximum. In addition, the size of its grains is approximately 80 nm, and the synthesis is carried out at considerably lower temperatures of heat treatment and with less duration of the last.

These advantages offered by the phosphor when used in a two-component source lighting with blue led will get the result "warm" white light with a higher color rendering index and to improve the uniformity of light scattering. The small grain size of the phosphor reduces the energy of synthesis, and during pressing to get more dense layers. In addition, the use of the phosphor in the thin-layer screen coatings will significantly increase their authorised the total capacity.

The phosphor for light sources containing aluminum, yttrium, cerium, lutetium and oxygen, characterized in that it contains these components in the following ratio:
5-60 wt.% in excess of 100% (Lu1-yCey)2O3,
where x=0,005-0,1; y=0.01 and 0.1.


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1 cl, 5 dwg, 1 tbl, 4 ex

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