乳化液膜系を微小反応場に用いた青色蛍光体Sr_2CeO_4微粒子の調製と蛍光特性

摘要

Sr_2CeO_4 blue phosphor particles were prepared, using an emulsion liquid membrane (ELM, water-in-oil-in-water (W/O/W) emulsion) system. Composite Sr-Ce oxalate fine particles were prepared in the ELM system, and then collected and calcined at 1273 K in air, to obtain submicrometer-sized Sr_2CeO_4 fine particles. The resulting Sr_2CeO_4 particles showed blue-white luminescence around 467 nm. When rare-earth ions were doped in the Sr_2CeO_4 particles, the emission spectra peculiar to the doped ions, effected by energy transfer from the triplet excited state of MLCT (metal-to-ligand charge transfer) state of Sr_2CeO_4 to the intra-4f transition state of the doped rare earth ions, were observed.