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Luminescence Properties of Ca 2 Ga 2 SiO 7 :RE Phosphors for UV White‐Light‐Emitting Diodes
Author(s) -
Jiao Mengmeng,
Lv Wenzhen,
Lü Wei,
Zhao Qi,
Shao Baiqi,
You Hongpeng
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402788
Subject(s) - phosphor , luminescence , doping , thermal stability , materials science , light emitting diode , excited state , analytical chemistry (journal) , diode , powder diffraction , photoluminescence , chemistry , optoelectronics , crystallography , physics , organic chemistry , chromatography , nuclear physics
A series of Eu 2+ ‐, Ce 3+ ‐, and Tb 3+ ‐doped Ca 2 Ga 2 SiO 7 phosphors is synthesized by using a high‐temperature solid‐state reaction. The powder X‐ray diffraction and structure refinement data indicate that our prepared phosphors are single phased and the phosphor crystalizes in a tetrahedral system with the ${P\bar 42m}$ (113) space group. The Eu 2+ ‐ and Ce 3+ ‐doped phosphors both have broad excitation bands, which match well with the UV light‐emitting diodes chips. Under irradiation of λ =350 nm, Ca 2 Ga 2 SiO 7 :Eu 2+ and Ca 2 Ga 2 SiO 7 :Ce 3+ , Li + have green and blue emissions, respectively. Luminescence of Ca 2 Ga 2 SiO 7 :Tb 3+ , Li + phosphor varies with the different Tb 3+ contents. The thermal stability and energy‐migration mechanism of Ca 2 Ga 2 SiO 7 :Eu 2+ are also studied. The investigation results indicate that the prepared Ca 2 Ga 2 SiO 7 :Eu 2+ and Ca 2 Ga 2 SiO 7 :Ce 3+ , Li + samples show potential as green and blue phosphors, respectively, for UV‐excited white‐light‐emitting diodes.