Effect of co-doping of Ce3+and alkaline metals on the photoluminescence in CaGa2S4and SrGa2S4hosts

✍ Scribed by Hidaka, Chiharu ;Miura, Kazutaka ;Oikawa, Shinya ;Takizawa, Takeo

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 376 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200669619

✦ Synopsis

Abstract

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)