Synthesis and Luminescence Properties of Green Oxynitride Phosphor

摘要

Nitride and oxy nitride based phosphors are of significant interest for use in phosphor converted white light emitting diodes (pc-WLEDs). In particular, silicon based nitrides such as M_2Si_5Ng:Eu~(2+) (M = Ca,Sr,Ba), MSi_2O_2N_2: Eu~(2+) (M= Ca, Sr, Ba), CaAlSiN_3 and Sialon:Eu~(2+) have been studied extensively as phosphors. In this article, we discuss synthesis and luminescence properties of (Ba_(1-x)Sr_x)_3Si_6O_(12)N_2 phosphor. The Eu~(2+) activated material shows efficient green emission around ～525 ran under 405nm excitation. Our results indicate a continuous redshift up to 30nm in Eu~(2+) luminescence with increasing concentration of Sr~(2+). These phosphors also show good thermal stability at high temperatures.