Novel color tunable garnet phosphor of Tb3+ and Eu3+ co-doped Ca2YZr2Al3O12 with high thermal stability via energy transfer

Abstract

Research process of phosphors with color-tunable luminescence properties has been a research hotspot in the field of high-quality white light emitting diodes. Herein, this paper report that a series of Tb3+ doped and Tb3+, Eu3+ co-doped Ca2YZr2Al3O12 phosphors were successfully prepared by the traditional solid-state reaction in air atmosphere. The crystal structure, optical performance and thermal quenching behavior were investigated in detail. CYZA: Tb3+, Eu3+ phosphors exhibited tunable color emission from green to yellow to red on the basis the energy transfer of Tb3+→Eu3+ under n-UV excitation. More impressively, as-prepared samples possess high thermal stability comparable or even superior to Lu3Al5O12: Ce3+ via designing the ratio of Tb3+/Eu3+ based on energy transfer. Influence mechanism of Eu3+ on the thermal stability of CYZA: Tb3+ was illustrated. The as-fabricated w-LED device shows a warm white light with high CRI (86.4) at CCT of 3431K. These results suggest its great potential as an excellent luminescent material for the design of warm white solid-state lighting.