Near-Green-Emitting Tb3+-Doped Transparent Glass Ceramics Containing Ba2LaF7 Nanocrystals for Application in White Light-Emitting Diodes
Near-Green-Emitting Tb3+-Doped Transparent Glass Ceramics Containing Ba2LaF7 Nanocrystals for Application in White Light-Emitting Diodes
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DOI：
10.1007/s10812-016-0281-6
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发表时间：
2016-05
影响因子：
0.7
通讯作者：
Shaoye Ouyang;W. Zhang;Zh. Zhang;Y. Y. Zhang-Y.
中科院分区：
文献类型：
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作者：
Shaoye Ouyang;W. Zhang;Zh. Zhang;Y. Y. Zhang-Y.
采用传统的熔体猝灭法成功合成了含Ba2LaF7的Tb3+激活的透明微晶玻璃，在近紫外光激发下，微晶玻璃呈现出近绿光发射。利用差示扫描量热法和X射线衍射仪对制备的玻璃样品的析出过程和微观结构变化进行了监测。在640~690℃温度范围内，随着处理温度的升高，微晶玻璃的透光率保持较高水平。对微晶玻璃发光性能的研究表明，Tb3+离子逐渐进入析出的氟化物晶相。在640℃热处理2 h后，在373 nm的激发下，Tb3+的5D4→7F5跃迁在543 nm处观察到主要发射。目前的研究结果表明，所制备的材料具有取代通常用于白色发光二极管的绿色荧光粉的潜力。此外，还研究了Tb3+离子在373 nm激发下543 nm波长的衰变寿命。
Tb3+-activated transparent glass ceramics containing Ba2LaF7were successfully synthesized by a conventional melt–quenching technique, and the glass ceramics displayed a near-green emission under near-ultraviolet excitation. Differential scanning calorimetry and X-ray diffraction were used to monitor the evolution and microstructural changes in the prepared glass specimens. The transparency levels of the glass ceramics remained high with increasing treatment temperatures from 640 to 690°C. Investigations on the luminescence properties of the glass ceramics revealed that Tb3+ions were gradually incorporated into the precipitated fluoride crystalline phase. After heat treatment at 640°C for 2 h, major emission was observed at 543 nm owing to5D4→7F5transition of Tb3+under 373-nm excitation. Current findings indicate that the prepared materials have potential as replacements to commonly employed green phosphors in white light-emitting diodes. Additionally, the decay lifetimes of Tb3+ions at 543 nm under 373-nm excitation were studied.