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Charge compensation and its influences on luminescent properties of red‐emitting Ca 3 (PO 4 ) 2 :Eu 3+ phosphor
Author(s) -
Zhang Zhan Hui,
Chen Li,
Da Jiang Nan,
Guo De Xing,
Cai Ke Qin,
Chi Ru An,
Huang Zhi Liang
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228267
Subject(s) - phosphor , photoluminescence , luminescence , activator (genetics) , emission intensity , analytical chemistry (journal) , materials science , doping , crystal structure , chemistry , optoelectronics , crystallography , biochemistry , chromatography , gene
Abstract In this paper, we report the obtention of red‐emitting Ca 3 (PO 4 ) 2 :Eu 3+ phosphor by the solid‐state reaction method. X‐ray diffraction and photoluminescence (PL) measurements were used to investigate the crystal phases, luminescent properties, and optimal Eu 3+ doping concentration. To further improve the PL intensity, Na + acting as a charge compensator was incorporated into the phosphor. The effects of Na + concentration on the PL properties were studied. It was found that the charge‐compensation phosphor showed greatly enhanced red emission beyond the phosphor without charge compensation. Ca 2.3 Na 0.4 (PO 4 ) 2 :0.3Eu 3+ was determined to be the best composition. The charge‐compensation mechanism was analyzed in light of the principles on defect formation and reaction, and the changes of the site centrosymmetry for the activator.Effects of Na + concentrations on the intensity of red emission. The inset showed the R/O ratios along with Na + concentrations.