4.6 Article

Photoluminescence and energy transfer of Tm3+ doped LiIn (WO4)2 blue phosphors

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JOURNAL OF LUMINESCENCE
卷 130, 期 12, 页码 2469-2475

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ELSEVIER
DOI: 10.1016/j.jlumin.2010.08.014

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Tm3+; Double tungstate; Photoluminescence; Energy transfer

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Room temperature steady and time resolved emission spectra of LiIn1-xTmx(WO4)(2) (where thulium concentration is 0, 0.5, 1, 5 and 10 at%) blue phosphors, under UV excitation energy have been investigated. The concentration quenching effect on the blue emission, due to the (WO4)(-2) groups and (1)G(4)-> H-3(6) emission transition of Tm3+ were studied. Two energy transfer mechanisms are shown. The first takes place between excited (WO4)(-2) groups and the (1)G(4) energy level of Tm3+, and is mainly analyzed by phonon-assisted energy transfer. The second mechanism is due to an energy transfer from the excited Tm3+ ions to the surrounding ground state Tm3+ ions. The non-exponential decay curves of the (1)G(4) level observed for higher concentrations are analyzed by the Inokuti-Hirayama model. We think that the quenching effect between Tm3+ ions is mainly linked to the dipole-dipole interactions. (C) 2010 Elsevier B.V. All rights reserved.

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