Satya Kishore Manepalli

Synthesis and Luminescence Properties of Green Oxynitride Phosphor

Recently, nitride and oxy nitride based phosphors are of significant interest to use in white light emitting diodes. They exhibit good thermal and chemical stability with high quantum efficiencies. In particular, silicon based nitrides such as M2Si5N8:Eu (M = Ca,Sr,Ba) (1), MSi2O2N2: Eu (M= Ca, Sr, Ba) (2), CaAlSiN3 (3), Sialon:Eu (4) have been studied extensively as phosphors. In this article, we discuss synthesis and luminescence properties of Sr doped barium silicon oxynitride phosphor (5,6). The Eu activated material shows efficient green emission peak around ~525 nm under 405/450nm excitation. Our results indicate continuous redshift up to 30nm in Eu luminescence by ‘Sr’ doping (Figure 1). The effect of dopant concentration on the crystal structure, luminescence properties and thermal quenching of these materials will also be discussed.