Intense red and green emissions from Ho3+/Yb3+ co-doped Sodium Gadolinium Molybdate Nano-phosphor: Effect of calcination temperature and Intrinsic optical bistability
Intense red and green emissions from Ho3+/Yb3+ co-doped Sodium Gadolinium Molybdate Nano-phosphor: Effect of calcination temperature and Intrinsic optical bistability
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DOI：
10.1016/j.materresbull.2020.111041
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发表时间：
2021
影响因子：
5.4
通讯作者：
P. Vishwakarma;S. Rai;A. Bahadur
中科院分区：
文献类型：
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作者：
P. Vishwakarma;S. Rai;A. Bahadur
采用共沉淀法制备了不同煅烧温度下的Ho3 +/Yb3+共掺杂Gd0. 5Na0. 5MoO4纳米荧光粉，研究了其结构和发光性能。样品的X射线衍射（XRD）图显示了纯的四方相的形成。用980 nm激光激发时记录的上转换（UC）光谱显示在545 nm（绿色）和659 nm（红色）处的强发射带，其中红色发射比绿色发射更强。强烈的红色适合生物成像。在452 nm激发下，观察到强烈的绿色下转换（DC）发光。结果表明，随着煅烧温度的升高，UC/DC发光强度增加。其中一个有趣的功能是观察到的内在光学双稳态（IOB）。该材料可应用于各种领域，例如生物细胞成像、光疗、光学开关、显示器件、太阳能电池等。
We present the structural and luminescent properties of Ho3+/Yb3+co-doped Gd0.5Na0.5MoO4nano-phosphor synthesized through the facile co-precipitation method at different calcination temperatures. The X-ray diffraction (XRD) patterns of the samples show the pure tetragonal phase formation. The upconversion (UC) spectra recorded on excitation with 980 nm laser show the intense emission bands at 545 nm (green) and 659 nm (red) in which red emission is more intense than green emission. The intense red is suitable for bio-imaging. Under 452 nm excitation, the intense green downconversion (DC) emission is observed. It is observed that with increasing the calcination temperature, the UC/DC emission intensity increases. One of the interesting features explored is the observation of intrinsic optical bistability (IOB). This material may be applicable in various fields such as biological cell imaging, phototherapy, optical switching, display devices, solar cells, etc.