白色発光ダイオード用蛍光体SrSi_2O_2N_2:Eu^<2+>の合成と発光特性(<特集>希土類系物質の精密合成,形態制御および機能物性)

概要

論文の詳細を見る
This work has investigated luminescence properties of SrSi_2O_2N_2 : Eu^<2+> phosphors synthesized by a new method using Sr_2SiO_4 : Eu^<2+> as a precursor. Compared with a conventional solid-state reaction method, this method provides increased crystallinity and luminescence efficiency. X-ray diffraction analysis has indicated that SrSi_2O_2N_2 : Eu^<2+> formed as an almost single-phase, but chemical analysis has shown that obtained samples have an oxygen/nitrogen atomic ratio deviated from the stoichiometric composition. It can be expected that luminescence efficiency of this phosphor will be higher for the stoichiometric composition than for non-stoichiometric ones. Under 460 nm excitation, this phosphor shows an emission band peaked at 538-564 nm for varied Eu^<2+> concentration, and shows the maximum at 15 mol% with high integrated photoluminescence intensity, which is about 1.05 times as high as that of the commercial yellow phosphor, (Y, Gd)_3Al_5O_<12> : Ce^<3+> (P46-Y3)
社団法人日本セラミックス協会の論文
2007-10-01