標題: Anomalous luminescence from Yb2+-doped Ca2PO4Cl
作者: Wang, De-Yin
Chiu, Yi-Chen
Huang, Chien-Hao
Wu, Yun-Chen
Chen, Teng-Ming
應用化學系
Department of Applied Chemistry
關鍵字: Luminescence;Ca2PO4Cl:Yb2+;Trapped-exciton state;Temperature-dependent luminescence
公開日期: 1-四月-2014
摘要: The photoluminescence of Ca2PO4Cl:Yb2+ has been investigated and compared with that of Ca2PO4Cl: Eu2+, and the application of Ca2PO4Cl:Yb2+ for white LED has been evaluated. The excitation spectra of Ca2PO4Cl:Yb2+ are dominated by an intense excitation band at 395 nm. Under near DV excitation at 395 nm, Ca2PO4Cl:Yb2+ shows a broad asymmetric emission with maximum at 490 nm. This emissions result from two different Yb2+ centers is evidenced by the low temperature (T=100 K) emission spectrum. Yb2+ luminescence differs significantly from that of Eu2+, most notably in the structure of emission spectra, and is characterized by a much broader emission band and lower quenching temperature. Such anomalous luminescence from Yb2+ is ascribed to the de-excitation process of the Yb2+-trapped exciton state. Ca2PO4Cl:Yb2+ has external quantum efficiency of 24% and exhibits 40% of luminescence quenching at 100 degrees C in the air and, therefore, these results reveal its limited potential in the fabrication of white-light LEDs. (C) 2013 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jlumin.2013.11.082
http://hdl.handle.net/11536/24755
ISSN: 0022-2313
DOI: 10.1016/j.jlumin.2013.11.082
期刊: JOURNAL OF LUMINESCENCE
Volume: 148
Issue: 
起始頁: 151
結束頁: 155
顯示於類別:期刊論文


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