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Photoluminescence of Rare‐Earth‐Doped Ca‐α‐SiAlON Phosphors: Composition and Concentration Dependence
Author(s) -
Xie RongJun,
Hirosaki Naoto,
Mitomo Mamoru,
Suehiro Takayuki,
Xu Xin,
Tanaka Hidehiko
Publication year - 2005
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.1551-2916.2005.00532.x
Subject(s) - phosphor , photoluminescence , luminescence , doping , rare earth , sialon , scanning electron microscope , analytical chemistry (journal) , materials science , sintering , ion , mineralogy , crystallography , chemistry , metallurgy , optoelectronics , organic chemistry , chromatography , composite material
Rare‐earth‐doped Ca‐α‐SiAlON phosphors, with the compositions of (Ca 1−3/2 x RE x ) m /2 Si 12− m − n Al m+n O n N 16− n (RE=Ce, Sm, and Dy, 0.5≤ m =2 n ≤3.0), were prepared by sintering at 1700°C for 2 h under 10 atm N 2 . The concentration of rare earths varied from 3 to 30 at.% with respect to Ca. The photoluminescence (PL) properties were investigated as functions of the composition of the host matrix (i.e., m ) and the concentration of rare earths (i.e., x ). The results show that the emission properties can be optimized by tailoring m and x . The Ce 3+ luminescence originating from the 4 f –5 d interconfigurational transitions is greatly affected by the environment surrounding the Ce 3+ ions, which differs from the Sm 3+ or Dy 3+ luminescence arising from the 4 f –4 f intraconfigurational transitions. X‐ray diffraction and scanning electron microscopy were used to explain the composition and concentration dependence of PL properties.