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

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• 作者：Jia ZHANG (张 佳)^a ; ^b ; ^{zhangjianew@126.com" class="auth_mail" title="E-mail the corresponding author} ; Along YU (俞阿龙)^a ; ^b ; Zhenghe HUA (华正和)^a ; ^b ; Shizheng WEN (温世正)^a ; ^b
• 关键词：luminescence ; phosphor ; light-emitting diodes ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：34
• 期：6
• 页码：565-570
• 全文大小：1048 K

文摘

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⁺,yTb³⁺,(0.04+y)Na⁺ with other red-emitting phosphors. Thus, the NCS:Ce³⁺,Tb³⁺,Na⁺ phosphors could be promising candidate for white LEDs.