Open AccessLuminescent properties and energy transfer mechanism of CaWO4：Sm3+ phosphors
Author(s) -
毕长虹,
孟庆裕
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.197804
Subject(s) - phosphor , excited state , materials science , doping , luminescence , scheelite , photoluminescence , excitation , energy transfer , ion , analytical chemistry (journal) , atomic physics , optoelectronics , physics , chemistry , quantum mechanics , chromatography , tungsten , metallurgy
The scheelite-structured CaWO4 phosphors doped with different concentrations of Sm3+ were prepared by precipitation method. Photoluminescence properties of Sm3+-doped CaWO4 samples were studied. Results indicate that red light emission of Sm3+ with higher color purity in the samples can be excited by 404 nm blue light. There are 4f-4f intrinsic emission of Sm3+ and a strong self-excitation emission of CaWO4 when excited by 240 nm short-wave ultraviolet, and the white light emission can be obtained. Experiments show that the best Sm3+ doping concentration is 2%. The energy transfer type between Sm3+ ions was determined to be the electric dipole-electric dipole interaction and the critical energy transfer distance (Dc) was calculated to be 2.0 nm.