Preparation and luminescence characteristics of Sr3SiO5：Eu^2＋ phosphor for white LED

The Sr3SiO5：Eu^2＋ phosphor was synthesized by high temperature solid-state reaction. The emission spectrum of Sr3SiO5：Eu^2＋ shows two bands centered at 487 and 575 nm, which well agree with the theoretic values of emission spectrum. The excitation spectrum for 575 nm emission center has several excitation bands at 365, 418, 458 and 473 nm. And the results show that the emission spectrum of Sr3SiO5：Eu^2＋ is influenced by the Eu^2＋ concentration. The relative emission spectra of the white-emitting InGaN-based YAG：Ce^3＋ LED and Sr3SiO5：Eu^2＋ LED were investigated. The results show that the color development of InGaN-based Sr3SiO5：Eu^2＋ is better than that of InGaN-based YAG：Ce^3＋, and the CIE chromaticity of InGaN-based Sr3SiO5：Eu^2＋ is （x=0.348, y=0.326）.     

Beam fanning effect and image storage in Ce： KNSBN crystal

A non-synchronously-numerating experimental system is applied in this research.The effect of the incident beam intensity I and the beam incident angleθon beam fanning effect is investigated with a singular beam incident on Ce:KNSBN crystal.The results show that the beam fanning effect strongly depends on I andθ.The threshold effect of I for the beam fanning in Ce:KNSBN crystal is observed,and the threshold intensity of incident beam keeps the same value of 38.2 mW/cm 2 for differentθ,and the steady beam fanning intensity Ifsat reaches a peak atθ=15°under the same I.In addition,the effect of the incident beam modulated on the beam fanning noise and holographic storage in Ce:KNSBN crystal is studied.And the results suggest that the beam fanning noise is effectively suppressed,and the quality of the reappearance image is greatly improved.     

白光LED 用单基质白色发光荧光粉的研究进展

白光LED 作为一种新型的固体光源, 在照明和显示领域有着巨大的应用前景. 简 要评述了近年来光转换型白光LED 用单基质白色发光荧光粉的研究进展. 重点阐述了以 Eu²⁺, Eu²⁺/Mn²⁺, Eu²⁺/Ce³⁺或Ce³⁺/Mn²⁺等作为激活剂的硅酸盐、氯硅酸盐、硼酸盐和氯铝 酸盐等单基质白色发光荧光粉的研究结果与最新进展. 同时, 对该类材料及其应用的研究 现状和发展方向进行了分析.