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Indexed by:期刊论文

Date of Publication:2015-10-28

Journal:RSC ADVANCES

Included Journals:SCIE、EI、Scopus

Volume:5

Issue:117

Page Number:96272-96280

ISSN No.:2046-2069

Abstract:A series of novel single-phase color tunable LiGd(WO4)(2)(LGW): Re3+ (Re = Tm, Tb, Dy, Eu) phosphors have been synthesized by a solid-state reaction. X-ray diffraction (XRD), FT-IR, photoluminescence (PL) and fluorescence decay curves were utilized to characterize the as-prepared samples. Under the excitation of UV light, LGW: Tm3+, LGW: Tb3+, LGW: Dy3+ and LGW: Eu3+ exhibit the characteristic emissions of Tm3+ (blue), Tb3+ (green), Dy3+ (yellow) and Eu3+ (red), respectively. On the one hand, by simply adjusting the doping concentration of Eu3+ ions in the LGW: 2% Tm3+, 4% Tb3+, x% Eu3+ system, a white emission in a single-phase was achieved by blending simultaneously the blue, green, and red emissions of Tm3+, Tb3+, and Eu3+ ions in the LGW host, in which the energy transfer from Tb3+ to Eu3+ ions was found to play an important role. On the other hand, a white emission can also be realized based on the energy transfer from Tm3+ to Dy3+ ions in the LGW: 2% Tm3+, x% Dy3+ system. The energy transfer mechanism from Tm3+ to Dy3+ ions has been demonstrated to be through dipole-quadrupole interaction and the critical distance (RTm-Dy) calculated by the concentration quenching method is 16.03 angstrom. The PL properties of as-prepared materials indicate that LGW: Re3+ (Re = Tm, Tb, Dy, Eu) may be potentially applied as single-phase white-light-emitting phosphors for UV-excited WLEDs.