Photoluminescence properties and energy transfer of Dy 3+ and Tm 3+ co-activated CaZrO 3 phosphor for white LEDs

Abstract

Single-phased CaZrO 3: Dy 3+, Tm 3+ series have been successfully synthesized by solid-state reaction, and their luminescence properties were investigated. Under 355 nm excitation, CaZrO 3: Dy 3+ series showed characteristic emission of Dy 3+, which exhibited yellowish white color. By introducing Tm 3+ into the matrix, the emitted hue of the Dy 3+-doped sample could be easily tailored to white, and simultaneously, energy transfer from Tm 3+ to Dy 3+ 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. © 2011 Copyright The Korean Information Display Society.