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Luminescent properties and energy transfer mechanism of CaWO4:Sm3+ phosphors

Bi Chang-Hong Meng Qing-Yu

Luminescent properties and energy transfer mechanism of CaWO4:Sm3+ phosphors

Bi Chang-Hong, Meng Qing-Yu
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  • Received Date:  26 May 2013
  • Accepted Date:  21 June 2013
  • Published Online:  05 October 2013

Luminescent properties and energy transfer mechanism of CaWO4:Sm3+ phosphors

  • 1. Key Laboratory for Photonic and Electric Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 51002041), the Foundation for Young Key Scholars of Higher Education Institution of Heilongjiang Province, China (Grant No. 1252G032), and the Foundation for Young Key Scholars of Harbin Normal University (Grant No. 11KXQ-06).

Abstract: 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.

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