Laser & Spectroscopy Laboratory, Department of Applied Physics, Indian School of Mines, Dhanbad 826004, India.
Laser & Spectroscopy Laboratory, Department of Applied Physics, Indian School of Mines, Dhanbad 826004, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2014;121:9-13. doi: 10.1016/j.saa.2013.10.053. Epub 2013 Oct 22.
The UV-Vis-NIR absorption studies of the Er(3+)/Er(3+)-Yb(3+) doped/codoped TeO2-ZnO (TZO) glasses fabricated by the melting and quenching method has been performed. The spectroscopic radiative parameters viz. radiative transition probabilities, branching ratios and lifetimes have been determined from the absorption spectrum by using Judd-Ofelt theory. The near infrared (NIR) to visible frequency upconversion (UC) have been monitored by using an excitation of 976 nm wavelength radiation from a CW diode laser. The effect of codoping with Yb(3+) ions on the intensity of the UC emission bands from the Er(3+) ions throughout visible region has been studied. The mechanism responsible for the observed upconversion emissions in the prepared samples have been explained on the basis of excited state absorption and efficient energy transfer processes.
采用熔融淬冷法制备掺/共掺铒（Er(3+)）/铒（Er(3+)）-镱（Yb(3+)）的二氧化碲-氧化锌（TZO）玻璃，对其进行紫外可见近红外吸收光谱研究。利用 Judd-Ofelt 理论，从吸收光谱中确定了光谱辐射参数，如辐射跃迁概率、分支比和寿命。通过连续波二极管激光器激发 976nm 波长辐射，监测近红外（NIR）到可见频域的上转换（UC）。研究了共掺 Yb(3+)离子对 Er(3+)离子在整个可见区 UC 发射带强度的影响。根据激发态吸收和有效的能量转移过程，解释了所制备样品中观察到的上转换发射的机制。
