期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 18, 页码 10222-10231出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp302252k
关键词
-
资金
- National Basic Research Program of China [2010CB327704]
- National Natural Science Foundation of China (NSFC) [51172227, 20921002]
Ce3+ and/or Eu2+ activated Ca8La2(PO4)(6)O-2 (CLPA) oxyapatite blue phosphors have been prepared via a Pechini-type sol-gel process. X-ray diffraction (XRD), photoluminescence (PL) spectra, absolute quantum yield, as well as lifetimes were utilized to characterize samples. The emission of Ce3+ and Eu2+ ions at different lattice sites has been identified and discussed. The CLPA:0.04Ce(3+) phosphor exhibits bright blue emission with higher quantum yield (67%) and excellent CIE coordinates (x = 0.160, y = 0.115) under UV excitation, and the CLPA:0.05Eu(2+) phosphor also exhibits blue emission with CIE coordinates (0.187, 0.164). The energy transfer from Ce3+ to Eu2+ in CLPA:Ce3+/Eu2+ phosphors has been validated and demonstrated to be a resonant type via a dipole-dipole mechanism. The critical distance (R,) of Ce3+ to Eu2+ ions in CLPA was calculated (by the spectral overlap method) to be 26.67 angstrom. The quantum yields of Ce3+ and Eu2+ coactivated CLPA phosphors are enhanced compared with that of Eu2+ activated samples due to energy transfer. The CIE coordinates of CLPA:0.04Ce(3+), 0.02Eu(2+) are (0.179, 0.169). The corresponding luminescence and energy transfer mechanisms have been proposed in detail. These blue phosphors might be promising for use in pc-white LEDs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据