稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2014年
8期
702-708
,共7页
董晓菲%陆启飞%卢志娟%毛智勇%王达健
董曉菲%陸啟飛%盧誌娟%毛智勇%王達健
동효비%륙계비%로지연%모지용%왕체건
rare earth ion%calcium sulphide%microwave%solvothermal
A distinct red-shift to 660 nm-featured longer wavelength of europium doped calcium sulphide nanocrystals was observed in a microwave (MW)-assisted solvothermal synthesis procedure. This red-shift was probably due to a combined effect from Mg2+codoping and strain accumulation at grain boundaries. The latter originated from the formation of small grains with an average size of around 200 nm in micrometer sized crystals upon Mg2+codoping. In particular, MW electromagnetic field suppressed grain growth and enabled a reconstruction of atoms at the inner grain boundary at which the field strength was intensified around rare earth ions in host lattices. This MW synthesis route provided an option to prepare luminescent crystals with the desired blue-excitable longer wavelength emission.
