Tunable Luminescence of Ce3+/Eu2+ Activated in Single-Phase Li2BaSiO4 Phosphor via Energy Transfer
Tunable Luminescence of Ce3+/Eu2+ Activated in Single-Phase Li2BaSiO4 Phosphor via Energy Transfer
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DOI：
10.1149/2162-8777/ac22e3
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发表时间：
2021-09
影响因子：
2.2
通讯作者：
Qiangsheng Pei;Lei Chen;Fu Du;Yanfei Xiao;Jiaqing Peng;Xinyu Ye
中科院分区：
文献类型：
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作者：
Qiangsheng Pei;Lei Chen;Fu Du;Yanfei Xiao;Jiaqing Peng;Xinyu Ye
采用高温固相法合成了一系列Ce 3+，Eu 2+共掺杂的Li 2BaSiO 4蓝绿色荧光粉。系统研究了相应样品的晶体结构、形貌、发光性能和温度特性。通过调节Ce 3+，Eu 2+共掺杂浓度，Li 2BaSiO 4：Ce 3+，Eu 2+的发射光谱主峰由400 nm移至500 nm。并得到了一系列从蓝色到青绿色连续变化的荧光粉，有效地补偿了白色LED在470-510 nm区域的差距。用荧光寿命法研究了Ce 3+、Eu 2+在Li 2BaSiO 4中的能量传递效率和机理。最高的能量转移效率为46.01%，能量转移机制被确定为电偶极-电偶极跃迁。最后，在紫外芯片（350 nm）表面分别涂覆蓝色、绿黄色、红色和青色荧光粉，制备了白色LED器件，器件表现出优异的发光特性（Ra= 95.2，CCT= 3105 K）。结果表明，所研制的Li 2BaSiO 4：Ce 3+，Eu 2+荧光粉在近紫外光激发下可作为单组分可调彩色发光材料。
A series of Ce 3+, Eu 2+ co-doped Li 2 BaSiO 4 cyan-green phosphors were synthesized by a high temperature solid phase method. The crystal structure, morphology, luminescent properties and temperature characteristics of the corresponding samples were systematically studied. The main peaks of the emission spectra of Li 2 BaSiO 4: Ce 3+, Eu 2+ were shifted from 400 nm to 500 nm by adjusting the Ce 3+, Eu 2+ co-doping concentration. And a series of phosphors with continuous changes from blue to cyan green were obtained, which effectively compensated for the gap between the white LED at 470–510 nm region. The energy transfer efficiency and mechanism of Ce 3+, Eu 2+ in Li 2 BaSiO 4 were studied by fluorescence lifetime. The highest energy transfer efficiency was 46.01%, and the energy transfer mechanism was determined to be electric dipole-electric dipole transition. Finally, fabricating a white LED device which coated blue, green-yellow, red and as-prepared cyan phosphors on the surface of ultraviolet chip (350 nm), and the device exhibited excellent luminescence characteristics (Ra= 95.2, CCT= 3105 K). The results show that the Li 2 BaSiO 4: Ce 3+, Eu 2+ phosphor developed can be regard as single-component tunable color luminescent materials under the excitation of near ultraviolet light.