Laser and Spectroscopy Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad-826004, Jharkhand, India.
Methods Appl Fluoresc. 2018 Jan 25;6(2):025003. doi: 10.1088/2050-6120/aa89bf.
Photoluminescence study of the Ho-Yb codoped ZrO, AlZrO and YZrO nanophosphors, synthesized by chemical co-precipitation method, upon excitation at 450 and 980 nm radiations have been performed. An improvement of about ∼4.5 times in the downconversion emission intensity of green band corresponding to the F, S → I transition for codoped YZrO nanophosphors compared to ZrO codoped nanophosphors has been observed. On varying the pump power density upon 980 nm excitation the colour tunability in the codoped YZrO nanophosphors has been observed. UC emission intensity of the green band arising from the Ho ion in the codoped YZrO nanophosphors is enhanced about ∼22 times compared to that of the codoped ZrO nanophosphors. The absorption and UC emission study for the codoped YZrO nanophosphors dispersed in different biologically compatible solvents viz. water, methanol, ethanol and dimethyl sulfoxide (DMSO) has been performed. The green UC emission intensity of about ∼1.3 and ∼1.7 times for the efficient codoped YZrO nanophosphors dispersed in methanol compared to that dispersed in water and DMSO respectively has been observed. The absorption spectra of an efficient upconverting YZrO nanophosphors dispersed in methanol exhibit no change with the passage of time.
采用化学共沉淀法合成了 Ho-Yb 共掺杂的 ZrO、AlZrO 和 YZrO 纳米荧光粉，研究了其在 450nm 和 980nm 辐射激发下的光致发光性能。与 ZrO 共掺杂纳米荧光粉相比，共掺杂 YZrO 纳米荧光粉中对应于 F、S→I 跃迁的绿光下转换发射强度提高了约 4.5 倍。在 980nm 激发下改变泵浦功率密度，观察到共掺杂 YZrO 纳米荧光粉的颜色可调谐性。与共掺杂 ZrO 纳米荧光粉相比，共掺杂 YZrO 纳米荧光粉中 Ho 离子的绿光 UC 发射强度增强了约 22 倍。研究了共掺杂 YZrO 纳米荧光粉在不同生物相容性溶剂（水、甲醇、乙醇和二甲基亚砜（DMSO））中的吸收和 UC 发射。与分散在水中和 DMSO 中的荧光粉相比，分散在甲醇中的高效共掺杂 YZrO 纳米荧光粉的绿光 UC 发射强度分别提高了约 1.3 倍和 1.7 倍。分散在甲醇中的高效上转换 YZrO 纳米荧光粉的吸收光谱在经过一段时间后没有变化。
