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Structure and Luminescence Characteristics of Eu 3+ ‐Activated Trigonal Layered Perovskite Ba 2 La 2 ZnW 2 O 12
Author(s) -
Yu Ruijin,
Li Mengxue,
Xie Nannan,
Wang Ting,
Xue Na
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13825
Subject(s) - phosphor , luminescence , photoluminescence , doping , excited state , materials science , crystal structure , tungstate , analytical chemistry (journal) , photoluminescence excitation , perovskite (structure) , crystallography , chemistry , optoelectronics , atomic physics , physics , chromatography , metallurgy
Eu 3+ ‐doped tungstate Ba 2 La 2 ZnW 2 O 12 phosphors with perovskite‐structure were prepared by the high temperature solid‐state reaction. The X‐ray powder diffraction ( XRD ) patterns and structure refinements indicate that the phosphors crystalized in the trigonal layer‐perovskite. The luminescence properties of the phosphors were investigated such as photoluminescence ( PL ) excitation and emission spectra, decay lifetimes, and color coordinates. It was found that the pure host shows self‐activated emission excited by the UV light. Moreover, Ba 2 La 2 ZnW 2 O 12 also shows scintillation characteristics under the X‐ray irradiation. The near‐ UV and blue light can efficiently excite Eu 3+ ‐doped Ba 2 La 2 ZnW 2 O 12 phosphors inducing the strong orange–red luminescence. The optimal Eu 3+ doping concentration in this host is 40 mol%. The luminescence spectra and the luminescence color of the phosphors strongly depend on the doping levels and excitation wavelength. The different luminescence features were discussed on the base of crystal structure. Eu 3+ ions have two possible substitutions on A or B sites in this trigonal layered perovskite. The phosphor could act as a candidate for the potential application in near‐ UV excited white‐ LED s lighting.