研究了用固相法制备的高密度发光材料γ－Ｂｉ２ＷＯ６：Ｐｒ３＋的结构、光致发光光谱、激发谱和γ－Ｂｉ２ＷＯ６的漫反射谱．由实验测得它的晶格参数为α＝５．４５Ａ，ｂ＝１６．４２Ａ，ｃ＝５．４３Ａ，密度Ｄｘ＝９．５３ｇ／ｃｍ３．它的光致发光光谱主发射峰位于６００、６０８、６１１、６２９ｎｍ，分别来自于Ｐｒ３＋的１Ｄ２→３Ｈ４、２Ｐｏ→３Ｈ６、３Ｐｏ→３Ｈ６、３Ｐｏ→３Ｆ２跃迁的发射．其激发谱由位于约２２５～４３０ｎｍ范围内、最大值约在３７２ｎｍ的主激发带和４５０ｎｍ的激发峰组成；主激发带来自于基质，可能是基质的带间吸收、Ｗ－Ｏ间电荷迁移吸收和缺陷能级的吸收；４５０ｎｍ的激发峰来自于 Ｐｒ３＋的３Ｈ４→３Ｐ２跃迁吸收．ＢＷＯ：Ｐｒ３＋的最佳掺杂浓度为 ０．８ｍｏｌ％左右．
The structure, excitation and emission spectra of photoluminescence of γ-Bi2WO6:Pr3+ prepared by solid state reaction
were studied, the diffusion reflection spectrum of γ-Bi2WO6 was recorded. The density D_x=9.53 g/cm3 and crystal parameters
a=5.45A, b=16.42A, and c=5.43A of γ-Bi2WO6:Pr3+ were measured. The main peaks of its photoluminescence spectrum are 600, 608 and 611, 629nm, which are from 1D2→3H4, 3P0→3H6, 3P0→3H6 and 3P0→3F2 transitions of Pr3+, respectively. The excitation spectrum of γ-Bi2WO6:Pr3+ consists
of the main excitation band with maximum 372nm and 450nm peak. The diffusion reflection spectrum indicates that there has strong
absorption in the range of 225-430nm, at the same time, the main excitation bands of excitation spectra of γ-Bi2WO6:Pr3+
and γ-Bi2WO6 are similar, which indicates that the main excitation band of γ-Bi2WO6:Pr3+ is from the host possibly due to the transition absorption of band-to-band, charge
transfer transition of W-O and defect level transitions. The 450nm peak is from characteristic absorption 3H4→3P2 of Pr3+. The
favorite dosage of Pr3+ in BWO:Pr3+ is about 0.8mol%.
参考文献
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