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Preparation, luminescence properties and energy transfer of Ca 9 Y(PO 4 ) 7 : Eu 2+ ‐Tb 3+ phosphors
Author(s) -
Tang Miao,
Fan Yanting,
Qiu Zhongxian,
Zhang Jilin,
Yu Liping,
Li Chengzhi,
Lian Shixun,
Zhou Wenli
Publication year - 2017
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.14837
Subject(s) - phosphor , luminescence , cyan , ion , analytical chemistry (journal) , doping , energy transfer , emission intensity , excitation , terbium , chemistry , photoluminescence , atomic physics , materials science , physics , optics , optoelectronics , organic chemistry , chromatography , quantum mechanics
Tb 3+ ‐doped and Eu 2+ , Tb 3+ co‐doped Ca 9 Y( PO 4 ) 7 phosphors were synthesized by conventional solid‐state method. Additionally, the luminescence properties, decay behavior and energy transfer mechanism have already been investigated in detail. The green emission intensity of Tb 3+ ions under NUV excitation is weak due to its spin‐forbidden f‐f transition. While Eu 2+ can efficiently absorb NUV light and yield broad blue emission, most of which can be absorbed by Tb 3+ ions. Thus, the emission color can be easily tuned from cyan to green through the energy transfer of Eu 2+ →Tb 3+ in Ca 9 Y( PO 4 ) 7 :Eu 2+ ,Tb 3+ phosphor. In this work, the phenomenon of cross‐relaxation between 5 D 3 and 5 D 4 are also mentioned. The energy transfer is confirmed to be resulted from a quadrupole‐quadrupole mechanism.