CsCI Modified Ge-Ga-S Glasses Codoped with Eu~(2+) and Mn~(2+): A Potential Yellow Phosphor for Solid-State Lighting

摘要

Notably enhanced Mn~(2+) yellow emission is observed in CsCI modified and Eu~(2+) /Mn~(2+) codoped Ge-Ga-S glasses under near-ultraviolet (NUV) excitation. The plausible efficiency of energy transfer (ET) from Eu~(2+) to Mn~(2+) is as high as 91%, which is obtained by measurement of luminescence decay of Eu~(2+) in samples doped with and without Mn~(2+) . The Eu~(2+)/Mn~(2+) codoping significantly increases the excitation cross section at the NUV region, which is at heart of the enhanced Mn~(2+) yellow emission. The ET processes responsible for the enhanced luminescence are discussed.