Y_2O_3:Eu螢光体の発光スペクトルにおけるBi^<3+>イオンの影響

概要

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To examine the sensitization phenomena of Bi^<3+> for Eu^<3+> emission in Y_2O_3 : Eu, Bi phosphors under 365.0 nm radiation, the emission spectra were measured both at room and liquid nitrogen temperature. As Bi^<3+> was added to Y_2O_3 : 10^<-1>Eu, Eu^<3+> emission with a maximum at 611 nm corresponding to ^5D_0→^7_F_2 transition gradually increased. Y_2O_3 : Bi phosphor had the emission with the peak at about 405 nm. This emission intensity increased with Bi^<3+> concentration, decreased by incorporation of Eu^<3+>, and was completely quenched in concentration ranges of Eu^<3+> and Bi^<3+> which show sensitization phenomena. The absorbed energy by Bi^<3+> in Y_2O_3 : Eu, Bi under 365.0 nm radiation, which would otherwise be emitted as 405 nm Bi^<3+> emission (as in Y_2O_3 : Bi or Y_2O_3 : Eu, Bi with low Eu^<3+> concentration), is transferred by a radiationless process to Eu^<3+> resulting in final 611 nm emission from excited Eu^<3+>.
明治大学の論文