The photoluminescence of single-phase warm white-light-emitting luminescence using CaSnO3:Ce3+/Mn4+/Dy3+ phosphors

Abstract

In this work CaSnO3:Ce3+/Mn4+/Dy3+ phosphors were synthesized by conventional solid state reaction method The best concentration of Ce3+ in CaSnO3 host that was excited in 266nm was determined to 0 5% We successfully turned the CIE of CaSnO3:0 5%Ce3+ from (0 1755 0 1755) to (0 3997 0 4060) by using 266 nm laser doping 0 3%Mn4+ and its correlated color temperature (CCT) is 3758 K In addition we turned the CIE of CaSnO3:0 5%Ce3+ 0 2%Mn4+ from (0 2937 0 1762) to (0 3702 0 3347) by using 325 nm laser doping 0 3%Dy3+ and the CCT is 3998 K The spectral overlap between the emission band of Ce3+ and the excitation band of Mn4+ supports the occurrence of the energy transfer from Ce3+ to Mn4+ And we speculate that the energy transfer from Ce3+ to Mn4+ was exchange interactions on the basis of Dexter's energy transfer formula

Date of Award	2019
Original language	English
Supervisor	Cheng-Liang Huang (Supervisor)