Photoluminescence, energy transfer, and thermal stability of BaAl₂Si₂O₈:Bi³⁺, Tb³⁺ phosphors for w-LEDs

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• 作者：Pingchuan Ma ; Yanhua Song ; Bo Yuan ; Ye Sheng ; Chengyi Xu ; Haifeng Zou ; ^{zouhf@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Keyan Zheng ; ^{zhky@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：BaAl2Si2O8 ; Bi3+ ; Tb3+ ; Color-tunable ; Energy transfer ; Thermal stability ; W-LEDs
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：60-70
• 全文大小：1924 K

文摘

A series of Tb³⁺ or/and Bi³⁺ doped BaAl₂Si₂O₈ phosphors were synthesized via solid-state method. The structure, luminescence properties and thermal stability were investigated. The optimum concentrations of Bi³⁺ and Tb³⁺ were 1.5 mol% and 7 mol%, respectively. Furthermore, BaAl₂Si₂O₈:0.015Bi³⁺ and BaAl₂Si₂O₈:0.07Tb³⁺ phosphors emitted blue and green light and the emission color of BaAl₂Si₂O₈:Bi³⁺, Tb³⁺ could be tuned from blue to green through the energy transfer. This energy transfer from Bi³⁺ to Tb³⁺ was confirmed and investigated by photoluminescence spectrum and decay lifetime. With constantly increasing Tb³⁺ concentrations, the energy transfer efficiency from Bi³⁺ to Tb³⁺ in BaAl₂Si₂O₈ host increased gradually and reached as high as 86.54%, the quantum yield was about 44.26%. The energy transfer mechanism (Bi³⁺-Tb³⁺) was proved to be dipole–dipole mechanism. The Tb³⁺ emission intensity can be considerably enhanced when monitored at NUV (377 nm) by co-doping Bi³⁺ ion. Moreover, the phosphor of BaAl₂Si₂O₈:0.015Bi³⁺, 0.07Tb³⁺ could exhibited strong green emission with good CIE chromaticity coordinate. The results indicate that BaAl₂Si₂O₈:Tb³⁺, Bi³⁺ is a potential green emitting phosphor for the application in w-LEDs.