Guo Heng, Devakumar Balaji, Vijayakumar R, Du Peng, Huang Xiaoyong
College of Physics and Optoelectronics, Taiyuan University of Technology Taiyuan 030024 P. R. China
Department of Electronic Engineering, Kyung Hee University Yongin-si Gyeonggi-do 446-701 Republic of Korea
RSC Adv. 2018 Sep 27;8(58):33403-33413. doi: 10.1039/c8ra07329e. eCollection 2018 Sep 24.
The Sm ion singly doped LiCaZnVO (LCZV) phosphors were synthesized by a traditional high-temperature solid-state method. The luminescence characteristics of the as-prepared samples were studied by photoluminescence excitation and emission spectra. Under 343 nm excitation, the synthesized phosphors exhibited color controllable emission induced by the efficient energy transfer from VO groups to Sm ions. Besides, the energy transfer efficiency was revealed to be about 58.4% when the dopant concentration was 4 mol%. By utilizing the as-prepared LCZV:Sm phosphors, commercial BaMgAlO:Eu blue-emitting phosphors and a near-ultraviolet light-emitting diode (LED) chip, a white LED device was fabricated. Under an injection current of 100 mA, the packaged LED device emitted pure white light with high color rendering index (88.4) and proper correlated color temperature (4320 K). By analyzing the thermal quenching behavior of the VO groups and Sm ions, the optical thermometric behavior of the Sm-doped LCZV compounds was investigated. The maximum absolute sensor sensitivity and relative sensor sensitivity were found to be 0.25 K and 1.8% K, respectively. Additionally, the emitting color of the studied samples was dependent on the temperature. Ultimately, the Sm-doped LCZV phosphors were potential candidates for indoor illumination, optical thermometry and safety signals in high temperature environments.
采用传统高温固相法合成了单掺Sm离子的LiCaZnVO（LCZV）荧光粉。通过光致发光激发光谱和发射光谱研究了所制备样品的发光特性。在343 nm激发下，合成的荧光粉由于VO基团到Sm离子的有效能量转移而呈现出颜色可控的发射。此外，当掺杂浓度为4 mol%时，能量转移效率约为58.4%。利用所制备的LCZV:Sm荧光粉、商用BaMgAlO:Eu蓝色发光荧光粉和近紫外发光二极管（LED）芯片，制备了一种白色LED器件。在100 mA的注入电流下，封装后的LED器件发出具有高显色指数（88.4）和适当相关色温（4320 K）的纯白光。通过分析VO基团和Sm离子的热猝灭行为，研究了Sm掺杂LCZV化合物的光学测温行为。发现最大绝对传感器灵敏度和相对传感器灵敏度分别为0.25 K和1.8% K。此外，所研究样品的发射颜色取决于温度。最终，Sm掺杂的LCZV荧光粉是室内照明、光学测温以及高温环境下安全信号的潜在候选材料。
