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Crystal Structure and Photoluminescence Properties of Red‐Emitting Ca 9 La 1−x (VO 4 ) 7 :xEu 3+ Phosphors for White Light‐Emitting Diodes
Author(s) -
Liu Lihong,
Xie RongJun,
Hirosaki Naoto,
Li Yuanqiang,
Takeda Takashi,
Zhang ChenNing,
Li Jiguang,
Sun Xudong
Publication year - 2010
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/j.1551-2916.2010.03994.x
Subject(s) - phosphor , photoluminescence , crystal structure , rietveld refinement , materials science , quenching (fluorescence) , crystallography , luminescence , powder diffraction , analytical chemistry (journal) , x ray crystallography , emission spectrum , ion , diffraction , chemistry , fluorescence , optics , physics , spectral line , optoelectronics , organic chemistry , chromatography , astronomy
This paper reports the crystal structure and photoluminescence properties of Ca 9 La 1− x (VO 4 ) 7 : x Eu 3+ ( x =0–1) phosphors synthesized at various temperatures (850°–1350°C) in air for 12 h using traditional solid‐state reaction method. Rietveld refinement of powder X‐ray diffraction pattern of Ca 9 Eu(VO 4 ) 7 indicated that the structure of Ca 9 Eu(VO 4 ) 7 consisted of [VO 4 ] tetrahedra and Ca/Eu atoms were filled in the space between the tetrahedral groups, with a random distribution for Eu 3+ ions on four individual Ca crystallographic sites. A major intense sharp emission line, locating at 613 nm under 465 nm excitation, was observed due to the 5 D 0 − 7 F 2 transition of Eu 3+ within 4 f configurations, which originates from the lower site symmetry in Ca 9 La 1− x (VO 4 ) 7 : x Eu 3+ . Interestingly, no concentration quenching was found in this phosphor, and thermal quenching was nearly not affected by Eu 3+ concentration. The experimental results suggested that this novel red‐emitting phosphor could be applied in white light‐emitting diodes.