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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Y2O2S:0.03Eu,0.03Ti的长余辉特性及Ti向Eu3+的余辉传能机制

洪樟连;张朋越;黄秋平;樊先平;王民权   

  1. 1.浙江大学材料科学与工程系
    2. 硅材料国家重点实验室, 杭州 310027
  • 收稿日期:2005-04-01 修回日期:2005-05-23 出版日期:2006-03-20 网络出版日期:2006-03-20

Afterglow and Energy Transfer from Ti to Eu3+ in Y2O2S:0.03Eu,0.03Ti Phosphor

HONG Zhang-Lian,ZHANG Peng-Yue,HUANG Qiu-Ping,FAN Xian-Ping,WANG Min-Quan   

  1. 1. Department of Materials Science and Engineering
    2.State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
  • Received:2005-04-01 Revised:2005-05-23 Published:2006-03-20 Online:2006-03-20

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摘要： 采用高温还原法合成了Eu, Ti共激活橙红色Y2O2S长余辉发光材料, 并测量Y2O2S:0.03Eu,0.03Ti磷光体的荧光光谱, 余辉分辨和余辉衰减曲线谱. 实验结果表明, Y2O2S:0.03Eu,0.03Ti磷光体的发射谱由一系列Eu3+离子内部能级跃迁的尖峰组成; 余辉分辨谱则不同, 由一个主峰位于565nm的宽发射带和一系列波长范围位于500nm以上的窄发射带两种峰形组成, 可分别归为Ti离子的宽带余辉发射和三价Eu3+的线状余辉发射. 分析认为, 样品中存在Ti余辉发射向Eu3+内部能级间产生选择性的余辉传能机制, 从而导致Y2O2S:0.03Ti,0.03Eu磷光体中同时出现两种发光中心离子的余辉分辨谱现象.

关键词: 长余辉, 传能, 磷光体, 发光, 稀土

Abstract:

A new kind of orange-red long afterglow Eu and Ti co-doped Y2O2S phosphor was synthesized via a traditional solid state reaction method under reducing atmosphere of CO. The photoluminescence spectrum, afterglow time-resumed spectrum and afterglow decay curve of the Y2O2S:0.03Ti,0.03Eu phosphors were measured. The result shows that the emission spectrum of Y2O2S:0.03Ti,0.03Eu consists of a group of narrow linear peaks from charge transmission of Eu3+. The orange-red afterglow was observed in present phosphors with two different luminescence centers: a broad yellow emission band around 565nm related to Ti emission and a group of narrow peaks of Eu3+ emission in the longer wavelength range. The afterglow mechanism of Eu3+ emission was suggested to come from the energy transfer process from Ti afterglow emission to Eu ions, and result in two different afterglow centers of Ti afterglow emission and Eu{3+} afterglow emission in present Y2O2S:0.03Ti,0.03Eu phosphor.

Key words: afterglow, energy transfer, phosphor, photoluminescence, rare earth