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Effect of co‐doping of Ce 3+ and alkaline metals on the photoluminescence in CaGa 2 S 4 and SrGa 2 S 4 hosts
Author(s) -
Hidaka Chiharu,
Miura Kazutaka,
Oikawa Shinya,
Takizawa Takeo
Publication year - 2006
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.200669619
Subject(s) - photoluminescence , alkaline earth metal , doping , phosphor , analytical chemistry (journal) , dopant , chemistry , cerium , alkali metal , ion , inorganic chemistry , mineralogy , materials science , optoelectronics , organic chemistry , chromatography
Ce 3+ doped alkaline‐earth thiogallates represented as M II Ga 2 S 4 (M II = Ca, Sr, Ba) are known as blue phosphors with high brightness and good purity of color. However the Ce concentration is limited below about 1 mol% in the process of the single crystal growth, presumably due to the charge imbalance of the dopant. Here in order to increase Ce 3+ concentration, alkaline metals and Ce ions are codoped in the alkaline earth thiogallates and the effect of co‐doping on the photoluminescence is studied. More than 15 mol% Ce doping is achieved, and PL intensity in Na codoped Ca and Sr thiogallates becomes three and five times stronger than that of the only Ce 3+ 1 mol% doping case, respectively. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)