Issue 119, 2015

Up/down conversion, tunable photoluminescence and energy transfer properties of NaLa(WO4)2:Er3+,Eu3+ phosphors

Abstract

Er3+ or/and Eu3+ codoped NaLa(WO4)2 down conversion (DC) and up conversion (UC) phosphors were prepared by a facile hydrothermal process. For NaLa(WO4)2:Er3+ phosphors, the WO42− group can efficiently absorb ultraviolet (UV) light, and emit bright blue and green emissions by the f–f transitions of Er3+ through the host sensitization effect. The critical distance of the Er3+ ions in NaLa(WO4)2 is calculated and the energy quenching mechanism is proven to be a resonant type dipole–dipole interaction. More significantly, in the Er3+ and Eu3+ codoped NaLa(WO4)2 phosphors, the bright green emissions of Er3+ ions and the red characteristic emissions of Eu3+ ions can be observed, and the Er3+–Eu3+ energy migration has been demonstrated to be a resonant type of a dipole–dipole mechanism. Color-tunable emissions of NaLa(WO4)2:Er3+,Eu3+ microcrystals are realized under different UV radiation, and this could make them good candidates for use as full-color DC phosphors for near UV-LEDs. More practically, under near infrared (NIR) laser excitation at 980 nm, these phosphors also exhibit intense green and red emissions from the Er3+–Eu3+ energy transfer process, which causes the observed UC of Eu3+. The mechanism of UC luminescence is proposed by the observed dependence of integral intensity on the power of the pumping laser.

Graphical abstract: Up/down conversion, tunable photoluminescence and energy transfer properties of NaLa(WO4)2:Er3+,Eu3+ phosphors

Article information

Article type
Paper
Submitted
27 Aug 2015
Accepted
21 Oct 2015
First published
21 Oct 2015

RSC Adv., 2015,5, 97995-98003

Author version available

Up/down conversion, tunable photoluminescence and energy transfer properties of NaLa(WO4)2:Er3+,Eu3+ phosphors

Y. Liu, Y. Liu, G. Liu, X. Dong and J. Wang, RSC Adv., 2015, 5, 97995 DOI: 10.1039/C5RA17370A

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