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Synthesis and luminescent properties of nanocrystalline CaYAlO 4 :Sm 3+ phosphors
Author(s) -
Kim Myung Sub,
Yu Jae Su
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201248464
Subject(s) - phosphor , nanocrystalline material , tetragonal crystal system , photoluminescence , luminescence , analytical chemistry (journal) , materials science , annealing (glass) , emission spectrum , spectral line , excitation , crystal structure , crystallography , chemistry , nanotechnology , optoelectronics , metallurgy , physics , chromatography , astronomy , engineering , electrical engineering
Nanocrystalline CaYAlO 4 :Sm 3+ phosphors were synthesized by a citrate‐based sol–gel method. After annealing at 1000 °C, the closely packed particles with pure tetragonal crystalline structure were observed. The photoluminescence spectra exhibited the emission peaks of 565 nm ( 4 G 5/2 → 6 H 5/2 ), 600 nm ( 4 G 5/2 → 6 H 7/2 ), and 650 nm ( 4 G 5/2 → 6 H 9/2 ) under an excitation wavelength of 409 nm. The optimum concentration of CaYAlO 4 :Sm 3+ phosphors was found to be 2 mol%. The lifetimes were measured to analyze the effect of Sm 3+ concentration in CaYAlO 4 host lattice. And similar emissions of cathode‐luminescence (CL) spectra were also observed. By increasing the accelerating voltage from 1 to 5 kV, the CL intensity was linearly increased.