Photoluminescence properties and energy transfer of Dy3+ and Tm3+ co-activated CaZrO3 phosphor for white LEDs

Abstract

Single-phased CaZrO3: Dy3+, Tm3+ series have been successfully synthesized by solid-state reaction, and their luminescence properties were investigated. Under 355 nm excitation, CaZrO3: Dy3+ series showed characteristic emission of Dy3+, which exhibited yellowish white color. By introducing Tm3+ into the matrix, the emitted hue of the Dy3+-doped sample could be easily tailored to white, and simultaneously, energy transfer from Tm3+ to Dy3+ was observed. The color coordinates of the optimum white-emitting sample were (0.321, 0.323), which were very close to the data of the National Television Standard Committee (0.33, 0.33). The co-activated phosphors presented good match to ultraviolet light-emitting diodes (LEDs), which revealed that they could be novel promising phosphors utilized in white LED application.