A novel UV pumped yellow-emitting phosphor Ba₂YAlO₅:Dy³⁺ for white light-emitting diodes

¹ College of Chemistry & Biology and Environmental Engineering, Xiangnan University, Chenzhou 423043, Hunan, P. R. China
² Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application, Chenzhou 423043, Hunan, P. R. China

^* Corresponding author:dengbinxnu@163.com (Bin Deng)

Abstract

A series of novel Dy³⁺ activated aluminate Ba₂Y_1-xDy_xAlO₅ (x = 0.01–0.30) red-emitting phosphors were synthesized through a high-temperature solid-state route at 1380°C. The X-ray diffraction patterns revealed that the samples were well crystallized in the space group P2_1/c (No. 14). The spectrum analysis revealed that under UV light excitation, Ba₂YAlO₅:Dy³⁺ phosphor exhibited blue and yellow peaks corresponding to ⁴F_9/2–⁶H_15/2 transition and ⁴F_9/2–⁶H_13/2 transition, respectively. The optimum dopant concentration of Dy³⁺ ions is around 2 mol% and the critical transfer distance of Dy³⁺ is calculated as 29 Å. The concentration quenching mechanism between Dy³⁺ has been investigated. Results indicate that Ba₂YAlO₅:Dy³⁺ offers the excellent optical properties as a potential yellow-emitting phosphor candidate for n-UV LEDs.