Spectral and defect analysis of Cu-doped combustion synthesized new SrAl 4O 7 phosphor

Abstract

A simple solution combustion synthesis route for preparation of Cu-doped SrAl 4O 7 has been described. Average particle size of 33 nm and platelet-like morphology has been observed. ESR studies confirm the presence of Cu in polycrystalline SrAl 4O 7. Bright-green luminescence under near-UV irradiation arising due to transition between Cu + levels with microsecond level decay time makes it suitable for application in phosphor converted light emitting diode (LED). TL measurements show broad glow peaks which when deconvoluted indicate activation energies in the range of 0.6–1.1 eV and elucidate the trapping dynamics.