Time-resolved photoluminescence analysis of two-peak emission behavior in Sr2Si5N8:Eu2+

Kee-Sun Sohn; Sangjun Lee; Rong-Jun Xie; Hirosaki, Naoto
September 2009
Applied Physics Letters;9/21/2009, Vol. 95 Issue 12, p121903
Academic Journal
Sr2Si5N8:Eu2+, one of the most recently developed phosphors for use in white light emitting diodes, exhibits a two-peak emission. Namely, the emission band of Sr2Si5N8:Eu2+ is deconvoluted into two Gaussian peaks irrespective of the Eu2+ concentration. We examined the two-peak emission of Sr2Si5N8:Eu2+ by analyzing the time-resolved photoluminescence spectra. We revealed that the two-peak emission was closely associated with the energy transfer taking place between Eu2+ activators located at two different crystallographic sites in the Sr2Si5N8 structure. The experimental results coincided well with the rate equation model involving the crystallographic information of the host.


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