Huang Hui-Ning, Zhou Juan, Zhou Hai-Feng, Yu Zhi-Chao, Wu Ya-Qiang, Zhou Guang-Jun
Shenzhen Research Institute of Shandong University, Shenzhen 518057, P. R. China.
Center for Disease Prevention and Control of Jinan Military Command, Jinan 250014, P. R. China.
J Nanosci Nanotechnol. 2018 Aug 1;18(8):5433-5440. doi: 10.1166/jnn.2018.15436.
Intense yellow-white NaLa(MoO4)2: Dy3+ phosphors co-doped with Li+ ions have been successfully synthesized via facile sol-gel combustion approach. The dependence of the crystal structure and crystallinity, particle morphology, photoluminescence property, fluorescent lifetime and absolute quantum efficiency of the as-prepared phosphors has been investigated. Stable yellow-white emission from 440 nm to 600 nm and higher absolute quantum efficiency were studied on Dy3+ doped NaLa(MoO4)2, Dy3+ and Li+ co-doped NaLa(MoO4)2, respectively. Surprisingly, only a small amount of Li+ can lead to a remarkable increase of the PL intensity and the quantum efficiency. Especially, along with 0.75 mol% Li+ ions induced in the NaLa(MoO4)2: Dy3+ phosphors, the absolute quantum efficiency increased from 13.8% to 22%, and the possible mechanism has been deeply discussed. Outstanding luminescence properties have certified that NaLa(MoO4)2: Dy3+, Li+ phosphors are promising candidates as new yellow-white components for optical devices.
通过简便的溶胶 - 凝胶燃烧法成功合成了共掺杂Li⁺离子的强烈黄白色NaLa(MoO₄)₂:Dy³⁺荧光粉。研究了所制备荧光粉的晶体结构与结晶度、颗粒形态、光致发光性能、荧光寿命和绝对量子效率之间的关系。分别研究了Dy³⁺掺杂的NaLa(MoO₄)₂、Dy³⁺和Li⁺共掺杂的NaLa(MoO₄)₂在440 nm至600 nm范围内稳定的黄白色发射以及更高的绝对量子效率。令人惊讶的是，仅少量的Li⁺就能显著提高PL强度和量子效率。特别是，随着在NaLa(MoO₄)₂:Dy³⁺荧光粉中引入0.75 mol%的Li⁺离子，绝对量子效率从13.8%提高到22%，并对可能的机理进行了深入讨论。优异的发光性能证明NaLa(MoO₄)₂:Dy³⁺,Li⁺荧光粉有望成为光学器件新型黄白色组分的候选材料。
