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Synthesis and Property Study of Borate and Chlorosilicate Phosphor

Author: ZhaoFangLiang
Tutor: YangZhiPing
School: Hebei University
Course: Optical Engineering
Keywords: White LED phosphor high temperate solid stated method Chlorosilicate
CLC: O482.31
Type: Master's thesis
Year: 2009
Downloads: 77
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Abstract


In this paper, some kinds of phosphor used for near ultraviolet LED were fabricated by traditional high temperate solid stated method. Compare with Joint Committee on Powder Diffraction Standards, the crystal structure of the phosphors were studied. And the emission and excitation spectra of the phosphor were investigated, so that the luminescent properties of the phosphor can be explained. The chief contents are given as follows:The green phosphor Sr3B2O6:Tb3+,Li+ was prepared. The role of charge compensation of Li+ ions to the emission intensity was studied also. It was found that Li+ ions can enhance the intensity of the emissions well. A novel green-emitting phosphor CaBa2(BO3)2:Eu2+ was prepared. The excitation spectrum is a broad band and its main peak is at 400nm, which matches the emission of near ultraviolet light-emitting diodes (nUVLEDs). When the concentration of doped Eu2+ is 2%, the CaBa2(BO3)2:Eu2+ has the strongest emission intensity.The red phosphor Ca2SiO3Cl2:Eu3+, Li+ was fabricated by solid stated method. The excitation spectrum is coupled well with the emission of UVLEDs (350-410 nm). The effects of doped-Eu3+ concentration and charge compensations of Li+ on the emission intensity are also investigated. The luminescence properties of single white emitting phosphor Eu2+,Mn2+ co-activated Ca10(Si2O7)3Cl2 were studied. The emission peaks that located at 426 nm and 523 nm originated from the center of the Eu2+, while the 585 nm emission was attributed to the energy transfer from Eu2+ to Mn2+.White light could be obtained by mixing the three emission colors of blue (426nm), green (523 nm) and red (585 nm) in the single host. The excitation bands of the three emission colors were all extended from 250 nm to 450 nm. Phosphor can be excited effectively by InGaN chips in the range of 380-410 nm.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Optical Properties > Luminescence
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