Preparation and Luminescence Properties of Single-Phase BaSi[sub 2]O[sub 2]N[sub 2]:Eu[sup 2+], a Bluish-Green Phosphor for White Light-Emitting Diodes

Abstract

phosphor was prepared by a method using as a precursor with a starting composition of . The formation behavior of and secondary phases was investigated in detail by means of X-ray diffraction analysis of the samples prepared under various conditions. The formation of secondary phases was suppressed by the method employed in this work and a single phase of was successfully obtained when the starting compositions with , , and were used. phosphors showed the bluish-green emission peaking at 490–500 nm along with varying concentrations of from 1 to 10 mol % ; particularly, the (5 mol %, ) phosphor showed an exceedingly strong emission peak intensity, which was about 3.7 times higher than that of the commercial yellow phosphor, (P46-Y3), under 460 nm excitation light. Furthermore, this phosphor maintained luminescence intensity at by 75% of the value measured at room temperature. These excellent luminescence properties and small thermal quenching suggested this phosphor to be applied as a bluish-green component for phosphor conversion white light-emitting diodes.