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Rare earth oxysalt phosphor and its application

A rare earth oxo acid salt, phosphor technology, applied in the direction of luminescent materials, semiconductor devices, electrical components, etc., can solve the problems of white light difficulty, luminous efficiency and temperature quenching characteristics can not fully meet practical applications, immature technology, etc.

Active Publication Date: 2014-11-19
王海容
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly three ways to realize white light LED. The first one is to form white light through the combination of red, green and blue LED chips. However, it is difficult to realize white light through this method, because the driving characteristics of three different color chips must be considered. The circuit design is very complicated
The second is to use the quantum effect and use the same semiconductor with different particle sizes to prepare LED chips to achieve white light. The white light LED realized by this method has high efficiency, but the cost is high, and the technology is not yet mature.
Sr 2 Si 5 N 8 : The luminance of Eu red powder is higher, but due to its physical and chemical stability compared to CaAlSiN 3 : Eu red powder is slightly worse, its luminous brightness at 150°C is 86% of that at room temperature, and 74% at 200°C, which limits its large-scale application to a certain extent
CaAlSiN 3 : Eu red powder has good physical and chemical stability and temperature quenching characteristics. Its luminous brightness at 150°C is 90% of that at room temperature and 82% at 200°C, but its main emission peak is 650nm, which is in the deep red band. The luminous brightness is not enough and needs to be further improved
[0007] The improved LuAG:Ce phosphor based on YAG:Ce yellow powder has better luminous efficiency and excellent temperature quenching characteristics. The brightness is 97% at room temperature and 90% at 200°C, but the raw materials of LuAG:Ce phosphor are relatively expensive, and the synthesis process is relatively complicated
[0008] In summary, currently used phosphors cannot fully meet the needs of practical applications in terms of luminous efficiency and temperature quenching characteristics under the excitation of ultraviolet LEDs or blue LEDs. Hotspots

Method used

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  • Rare earth oxysalt phosphor and its application
  • Rare earth oxysalt phosphor and its application
  • Rare earth oxysalt phosphor and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Li 2 Y 1.86 Al 3 B 0.1 P 0.9 O 10.9 :Ce 0.14 Synthesis of phosphor:

[0030] In the chemical composition formula (RE 1-x Ln x ) y M z R r (A 1-a D a ) b O c E d Set RE=Y, Ln=Ce, M=Li, A=(Al, B), D=P, weigh various raw materials so that the molar ratio of constituent ions is Li:Y:Al:B: P: O: Ce = 2: 1.86: 3: 0.1: 0.9: 10.9: 0.14 (x = 0.07, y = 2, z = 2, r = 0, a = 0.225, b = 4, c = 10.9, d = 0).

[0031] Weigh 0.75gLi 2 CO 3 , 2.08gY 2 O 3 , 1.53gAl 2 O 3 , 0.06gH 3 BO 3 , 1.19g(NH 4 ) 2 HPO 4 , 0.24gCeO 2 After being thoroughly ground and mixed uniformly, it is put into an alumina crucible and fired in a reducing atmosphere, and kept at 1560° C. for 2 hours to obtain the phosphor. See the excitation spectrum and emission spectrum figure 1 , The FWHM of the emission spectrum is about 112nm, and the main peak of the emission spectrum is in the green region of 540nm; the excitation spectrum is a broadband double-peak excitation spectrum composed of two bands with pe...

Embodiment 2～20

[0034] In the chemical composition formula (RE 1-x Ln x ) y M z R r (A 1-a D a ) b O c E d In, set RE = (Y, Lu, Gd, La, Tb, Sm), Ln = (Ce, Pr), M = (Li, K), R = (Sr, Zr), A = (Al, B , Ga), D=P, E=Cl, weigh various raw materials according to the specific chemical formula composition of each embodiment in Table 1, the preparation process is the same as that of Example 1, and the luminescence characteristics of the obtained phosphor are shown in Table 1.

[0035] Table 1 Chemical formulas and luminescence characteristics of Examples 1-20 (excitation wavelength is 460nm)

[0036]

[0037] It can be seen from Table 1 that under the excitation of 460nm blue light, the emission spectrum of the phosphors listed in Table 1 covers the green to red region from 525nm to 611nm, and the luminescence performance of most phosphors is better than that of commercial YAG. It is a class of phosphors for blue LEDs with excellent performance.

Embodiment 21

[0038] Example 21: Y 0.94 SrCaZr 2 Al 2.9 B 0.1 O 12 :Ce 0.06 Synthesis of phosphor:

[0039] In the chemical composition formula (RE 1-x Ln x ) y R p (A 1-q D q ) m O c E d Set RE=Y, Ln=Ce, R=(Sr,Ca,Zr), A=(Al,B), weigh various raw materials so that the molar ratio of constituent ions is Y:Sr:Ca: Zr:Al:B:O:Ce=0.94:1:1:2:2.9:0.1:12:0.06 (x=0.06, y=1, p=4, q=0, m=3, c=12, d=0).

[0040] Weigh 2.10gY 2 O 3 , 1.476gSrCO 3 , 1.0gCaCO 3 , 2.46gZrO 2 , 1.48gAl 2 O 3 , 0.06gH 3 BO 3 , 0.1gCeO 2 After being thoroughly ground and mixed uniformly, it is put into an alumina crucible and fired in a reducing atmosphere, and kept at 1420° C. for 2 hours to obtain the phosphor. The half-height width of the emission spectrum is about 120nm, the main peak of the emission spectrum is in the blue and green region of 497nm; the excitation spectrum is a continuous broadband excitation spectrum in the range of 320nm to 430nm, and the main excitation peak is at 415nm. Very good match; under the excitat...

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Abstract

The invention relates to a rare earth oxysalt phosphor and its application. The chemical composition of the phosphor is (RE1-xLnx)yMzRr(A1-aDa)bOcEd, wherein RE contains at least one of Sc, Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Bi; Ln contains at least one of Ce and Pr; M contains at least one of Li, Na, K, Rb and Cs; R contains at least one of Ca, Sr, Ba, Mg, Zn, Cd, Ni, Mn, Zr, Hf and Ti, and at least contains Zr; A contains at least one of Al, B, Ga and Cr; D contains at least one of P, V, Nb and Ta; E contains at least one of F and Cl; O is oxygen; and x is more than 0 and not more than 0.5, y is not less than 0.5 and less than 3, z is not less than 1 and not more than 4, r is not less than 0 and not more than 4, a is not less than 0 and less than 0.5, b is not less than 3 and not more than 5, c is more than 6 and not more than 16, d is not less than 0 and not more than 2, and the value of a*b is less than z. The phosphor has excellent luminescence and temperature quenching characteristics.

Description

Technical field [0001] The present invention relates to the field of solid luminescent materials, in particular to a rare earth oxo acid salt phosphor, and also to a light-emitting element and pigment containing the phosphor. Background technique [0002] Phosphors are used in various fields of lighting and display. Especially with the development of semiconductor lighting technology, phosphors used in white LEDs have received more and more attention. White LED has high photoelectric conversion efficiency, energy saving and environmental protection, long service life, safety and reliability, and is recognized as the next generation of green lighting source. Currently, there are three main ways to realize white light LED. The first is to form white light by combining red, green and blue LED chips. However, it is difficult to realize white light by this method because the driving characteristics of three different color chips must be considered. The circuit design is very complica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81C09K11/80C09K11/85H01L33/50
Inventor 王海容
Owner 王海容