Luminescence of emission-tunable Na_15.6Ca_3.84Si₁₂O₃₆:Ce³⁺,Tb³⁺,Na⁺ phosphors for near-ultraviolet light-emitting diodes

张佳^1,2，俞阿龙^1,2，华正和^1,2，温世正^1,2

1. School of Physics and Electronic Electrical Engineering Huaiyin Normal University2. Jiangsu Provincial Key Laboratory of Modern Measurement Technology and Intelligent System

摘 要：A series of Na_15.6Ca_3.84Si₁₂O₃₆:Ce³⁺,Tb³⁺,Na⁺(NCS:Ce³⁺,Tb³⁺,Na⁺) phosphors were prepared by conventional solid-state reaction method, and their photoluminescence properties under near-ultraviolet（NUV） excitation were studied. The excitation spectrum of Ce³⁺-single-doped NCS showed a broad excitation band from 250 to 400 nm, which could well match with the emission wavelength of the NUV LED chip. Upon 365 nm excitation, the NCS:Ce³⁺,Na⁺ phosphor demonstrated a blue emission in the range of 400–600 nm with the predominated peak at 443 nm. By co-doping Tb³⁺ into NCS:0.04Ce³⁺,0.04Na⁺, tunable-emission was realized due to the energy transfer from Ce³⁺ to Tb³⁺, and nearly white light was also obtained. The investigation also revealed that warm white light could be further generated by combining the NCS:0.04Ce³⁺,y Tb³⁺,（0.04+y）Na⁺ with other red-emitting phosphors. Thus, the NCS:Ce³⁺,Tb³⁺,Na⁺ phosphors could be promising candidate for white LEDs.

关键词：