Charge-Transfer Luminescence and Energy Transfer in Eu2+-Doped Barium Zirconosilicates

被引:9
|
作者
Wang, De-Yin [1 ,2 ]
Wang, Ling-Li [3 ]
Lee, Te-Ju [1 ,2 ]
Chen, Teng-Ming [1 ,2 ]
Cheng, Bing-Ming [4 ]
机构
[1] Natl Chiao Tung Univ, Phosphors Res Lab, Hsinchu 30010, Taiwan
[2] Natl Chiao Tung Univ, Dept Appl Chem, Hsinchu 30010, Taiwan
[3] Guangzhou Res Inst Nonferrous Met, Guangzhou 510651, Guangdong, Peoples R China
[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan
关键词
EFFICIENCY;
D O I
10.1149/2.008112jes
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Although zirconates are known to show ultraviolet luminescence under X-ray excitation, few have studied the vacuum ultraviolet (VUV) excited luminescence of zirconate compounds. We have investigated the VUV-excited luminescence of zirconate in BaZrSi3O9 and Ba2Zr2Si3O12 using synchrotron radiation, and examined the possibility of sensitizing Eu2+ by hosts that contain zirconate. Upon VUV excitation, BaZrSi3O9 and Ba2Zr2Si3O12 show self-activated emission peaking at 285 nm and 334 nm, which are assigned to Zr4+-O2- charge transfer (CT) luminescence. The evidence for the occurrence of Zr4+-O2- charge transfer in BaZrSi3O9 and Ba2Zr2Si3O12 was further supported by density of state (DOS) calculation. Energy transfer from host excitation (similar to 172 nm) to Eu2+ was observed in BaZrSi3O9:Eu2+ and Ba2Zr2Si3O12:Eu2+, showing that host sensitization of Eu2+ occurs in these materials. Despite that the host emission overlaps with the Eu2+ 4f-5d absorption band significantly, host -to-Eu2+ energy transfer in Ba2Zr2Si3O12:Eu2+ was found to be less efficient than that in BaZrSi3O9:Eu2+ and Eu2+ luminescence was found to be inferior in Ba2Zr2Si3O12:Eu2+. These observations are ascribed to a smaller Zr-O-Ba(Eu) angles and a lower Eu2+-Zr4+ metal-to-metal charge transfer energy in Ba2Zr2Si3O12:Eu2+. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.008112jes] All rights reserved.
引用
收藏
页码:J377 / J382
页数:6
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