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Investigation of concentration quenching effect in Tm3+-doped NaY(WO4)2 crystal

Han Lin Song Feng Zou Chang-Guang Su Jing Yan Li-Hua Tian Jian-Guo Zhang Guang-Yin

Investigation of concentration quenching effect in Tm3+-doped NaY(WO4)2 crystal

Han Lin, Song Feng, Zou Chang-Guang, Su Jing, Yan Li-Hua, Tian Jian-Guo, Zhang Guang-Yin
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  • Received Date:  20 November 2006
  • Accepted Date:  10 December 2006
  • Published Online:  20 July 2007

Investigation of concentration quenching effect in Tm3+-doped NaY(WO4)2 crystal

  • 1. 南开大学物理科学学院光子学中心,天津 300071

Abstract: Upconversion blue emissions of Tm3+ ions with different doping (0.5at.%, 3 at.%, 5 at.%) in NaY(WO4)2 crystals are investigated under 800nm diode laser excitation. The upconversion mechanism and the dependence of upconversion efficiency on ion concentration are analyzed with respect to the absorption spectra, fluorescence spectra, and parameters calculated by Judd-Ofelt theory. Four ion-ion interaction processes: 3H5+1G4→3H6+1D2, 3H5+3H5→3H6+3F3, 1G4+3H6→3F4+3F3,1G4+3H6→3F3+3F4, which influence the upconversion dominantly in Tm3+ heavy-doped system, are demonstrated theoretically and experimentally. The results indicate that cross-relaxation and cooperative upconversion are the dominant processes affecting the blue emission efficiency.

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