標題: Luminescent Properties and Energy Transfer of Green-Emitting Ca3Y2(Si3O9)(2):Ce3+,Tb3+ Phosphor
作者: Chiu, Yi-Chen
Liu, Wei-Ren
Yeh, Yao-Tsung
Jang, Shyue-Ming
Chen, Teng-Ming
應用化學系
Department of Applied Chemistry
關鍵字: calcium compounds;cerium;doping;materials preparation;phosphors;photoluminescence;reflectivity;spectral line intensity;terbium;yttrium compounds
公開日期: 1-Jan-2009
摘要: Green-emitting phosphors of Ca3Y2(Si3O9)(2):Ce3+,Tb3+ have been synthesized by solid-state reaction. The luminescence properties were characterized by photoluminescence (PL) and photoluminescence excitation spectra, reflection spectra, and a detection system using an integrating sphere equipped with a spectrofluorometer. With Ce3+ co-doping as a sensitizer, the PL intensity of Ca3Y2(Si3O9)(2):Ce3+,Tb3+ was found to increase dramatically by a factor of 5.8. For comparison, the emission intensity of composition-optimized Ca3Y2(Si3O9)(2):Ce3+,Tb3+ is 126% of green commodity, ZnS:Cu,Al. The quantum efficiency of Ca3Y2(Si3O9)(2):Ce3+,Tb3+ is as high as 77% compared to ZnS:Cu,Al (53%). The energy transfer from Ce3+ to Tb3+ is also of resonant type via a dipole-dipole mechanism with the energy-transfer critical distance of 6.78 A degrees. By utilizing the principle of energy transfer and appropriate tuning of activator contents, we are currently evaluating the potential application of Ca3Y2(Si3O9)(2):Ce3+,Tb3+ as a highly efficient UV-convertible phosphor.
URI: http://dx.doi.org/10.1149/1.3148242
http://hdl.handle.net/11536/149802
ISSN: 0013-4651
DOI: 10.1149/1.3148242
期刊: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume: 156
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