Y2O2S:0.03Eu,0.03Ti的长余辉特性及Ti向Eu3+的余辉传能机制
Afterglow and Energy Transfer from Ti to Eu3+ in Y2O2S:0.03Eu,0.03Ti Phosphor
Received date: 2005-04-01
Revised date: 2005-05-23
Online published: 2006-03-20
洪樟连 , 张朋越 , 黄秋平 , 樊先平 , 王民权 . Y2O2S:0.03Eu,0.03Ti的长余辉特性及Ti向Eu3+的余辉传能机制[J]. 无机材料学报, 2006 , 21(2) : 329 -334 . DOI: 10.3724/SP.J.1077.2006.00329
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
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