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白光LED灯用蓝色荧光粉的发光性能和结构

    作者:宏拓新软件
    发布日期:2008-10-21         
阅读:55     
 
 

摘 要:按2(Sr0.99,Eu^2+0.01)O-0.16B2O3-0.84P2O5配料以固相法合成蓝色荧光粉。该荧光粉在还原性气氛中,分别在1100,1150,1200℃和1250℃下进行焙烧。对不同温度下制成的样品进行X射线衍射分析,确定样品的晶体结构及晶相组成。通过测定样品的激发光谱和发射光谱,研究了焙烧温度对荧光粉结构的影响。结果表明:在1200℃下合成的荧光粉Sr6BP5O20为单一相,属四方晶系,P4/mmm空间群,晶胞参数分别为α=0.9794nm;c=0.9516nm,对应发射谱中478nm的发射峰;在低于1200℃下合成的荧光粉中含有α-Sr3(PO4)2和α-Sr2P2O72个晶相,对应发射谱中420nm的发射峰。

关键词:硼磷酸盐;蓝色荧光粉;光致发光;

Abstract:Blue phosphors with the formula of 2(Sr0.99. Eu^2+ 0.01)O-0.16B2O3-0.84P2O5 were synthesized by a solid state reaction method. Phosphors were calcined at 1 100, 1 150, 1200℃ and 1250 ℃ under a reducing atmosphere. Photoluminescence spectra of these phosphors were measured. The effects of calcining temperature on structural variations of the phosphors were investigated. According to X-ray diffraction results, the crystal assembly of the sample calcined at 1200℃ is Sr6BP5O20 with a unitary tetragonal phase in the P4/mmm space group with the cell parameters a and c as 0.979 4 nm and 0.951 6 nm, corresponding to the emission at 478 nm. In the case of phosphors synthesized at temperatures lower than 1200℃, α-Sr3(PO4)2 and α-Sr2P2O7 phases were found with the emission at 420 nm.

Key words:borophosphate; blue phosphors; fluorescence spectra

As the most promising candidate to replace conventional fluorescent lamps,light.emi Ring diodes(LEDs) have been in dem and for solid.state lighting technology in recent years.L _o Although the simulated high.color.

rendering potential of light sources consisting Of 36I)_一400 nln ultraviolet LED (Uv.LED)and tricolor phos.phors has been reported an d experimentally confirmed,Lthere are currently insufficient references on the use of phosphor converted to UV LED as illumination sources.

T【lis is due to the relative novelty of the concept that tri.color phosphors can be applied fo r this purpose;they would have be excitated at around 36州00nli1 over a wide ban d ran ge an d have high quan tum efi ciency.Cur.rently,there has been little research on the use of phos.phor fo r UV.LED applications.

 

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