標題: | Luminescent Properties and Energy Transfer of Green-Emitting Ca(3)Y(2)(Si(3)O(9))(2):Ce(3+),Tb(3+) 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 |
公開日期: | 1-一月-2009 |
摘要: | Green-emitting phosphors of Ca(3)Y(2)(Si(3)O(9))(2):Ce(3+),Tb(3+) 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 Ce(3+) co-doping as a sensitizer, the PL intensity of Ca(3)Y(2)(Si(3)O(9))(2):Ce(3+),Tb(3+) was found to increase dramatically by a factor of 5.8. For comparison, the emission intensity of composition-optimized Ca(3)Y(2)(Si(3)O(9))(2):Ce(3+),Tb(3+) is 126% of green commodity, ZnS:Cu,Al. The quantum efficiency of Ca(3)Y(2)(Si(3)O(9))(2):Ce(3+),Tb(3+) is as high as 77% compared to ZnS:Cu,Al (53%). The energy transfer from Ce(3+) to Tb(3+) 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 Ca(3)Y(2)(Si(3)O(9))(2):Ce(3+),Tb(3+) as a highly efficient UV-convertible phosphor. |
URI: | http://dx.doi.org/10.1149/1.3148242 http://hdl.handle.net/11536/7892 |
ISSN: | 0013-4651 |
DOI: | 10.1149/1.3148242 |
期刊: | JOURNAL OF THE ELECTROCHEMICAL SOCIETY |
Volume: | 156 |
Issue: | 8 |
起始頁: | J221 |
結束頁: | J225 |
顯示於類別: | 期刊論文 |