Ethylene glycol assisted low-temperature synthesis of Eu3+-activated BiF3: Highly efficient red-emitting nanoparticles for field emission displays and near-ultraviolet white light-emitting diodes
Ethylene glycol assisted low-temperature synthesis of Eu3+-activated BiF3: Highly efficient red-emitting nanoparticles for field emission displays and near-ultraviolet white light-emitting diodes
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DOI：
10.1016/j.jallcom.2019.01.219
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发表时间：
2019-05
影响因子：
6.2
通讯作者：
Peng Du;J. Yu
中科院分区：
文献类型：
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作者：
Peng Du;J. Yu
采用低温乙二醇辅助化学沉淀法成功合成了Eu 3+激活的BiF 3纳米粒子。所有样品都能被近紫外光有效激发，发射出对应于Eu ~（3+）离子4f-4f跃迁的可见光。Eu 3+离子在BiF 3基质材料中的最佳掺杂浓度为15 mol%，偶极-偶极相互作用对浓度猝灭机制有贡献。所研究的化合物的内量子效率高达83.5%。此外，通过分析随温度变化的光致发光发射光谱，系统地研究了所得纳米颗粒的热猝灭行为。借助于Judd-Ofelt理论，我们进行了理论计算，并估算了光跃迁参数，从而确定了所选基质晶格中掺杂剂周围的局域结构环境特性。通过将制备的纳米粒子与NUV芯片、商业化的蓝光和绿光化合物集成，获得了能够发出耀眼的白色光的发光二极管器件，其显色指数和相关色温分别为90.7和6530 K。此外，阴极射线发光性能的研究样品作为加速电压和灯丝电流的函数也进行了详细的研究。
The Eu3+-activated BiF3nanoparticles with high luminescent efficiency were successfully synthesized via a low temperature ethylene glycol assisted chemical precipitation method. All the resultant samples can be efficiently excited by near-ultraviolet (NUV) light and emit visible emissions corresponding to the 4f-4f transition of Eu3+ions. The optimal doping concentration of the Eu3+ions in the BiF3host material was 15 mol% and the dipole-dipole interaction contributed to the concentration quenching mechanism. The internal quantum efficiency of the studied compounds reached up to 83.5%. Furthermore, the thermal quenching behaviors of the resultant nanoparticles were systematically investigated by analyzing the temperature-dependent photoluminescence emission spectra. With the aid of Judd-Ofelt theory, we performed a theoretical calculation and the optical transition parameters were estimated so as to identify the local structure environment properties surrounding the dopants in the selected host lattices. Through integrating the fabricated nanoparticles with a NUV chip, commercial blue-emitting and green-emitting compounds, a light-emitting diode device was achieved, which can emit dazzling white light and its color rendering index and correlated color temperature were 90.7 and 6530 K, respectively. Additionally, the cathodoluminescence performance of the studied samples as a function of accelerating voltage and filament current was also investigated in detail.