Peng Mingying, Zhang Na, Wondraczek Lothar, Qiu Jianrong, Yang Zhongmin, Zhang Qinyuan
Institute of Optical Communication Materials and State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China.
Opt Express. 2011 Oct 10;19(21):20799-807. doi: 10.1364/OE.19.020799.
The effects of temperature, pump power and excitation wavelength on near-infrared photoluminescence from Bi-doped multi-component germanate glasses are presented. Compared to conventional silica/silicate matrices, the examined material exhibits superior resistance to thermal quenching and less pronounced excited state absorption for pumping at 808 nm. It is shown that by selecting the optimal excitation wavelength, photoemission can be initiated from multiple active centers in parallel, resulting in an emission bandwidth (full width at half maximum) of more than 370 nm. Er3+/Bi co-doping is presented as an effective means to significantly enhance emission intensity around 1.5 μm by suppressing the typical Er3+-related red-to-green upconversion. Besides its relevance for Bi-doped materials, this also indicates a new route towards improving the performance of Er-based optical devices. The mechanism of Er3+→Bi energy transfer is examined in detail. Adjusting the molar ratio between both species provides an effective tool for tuning the emission scheme and further increasing emission bandwidth.
介绍了温度、泵浦功率和激发波长对掺铋多组分锗酸盐玻璃近红外光致发光的影响。与传统的二氧化硅/硅酸盐基质相比，所研究的材料表现出优异的抗热猝灭性能，并且在808 nm泵浦时激发态吸收不那么明显。结果表明，通过选择最佳激发波长，可以从多个活性中心并行引发光发射，从而产生超过370 nm的发射带宽（半高全宽）。通过抑制典型的与Er3+相关的红到绿上转换，Er3+/Bi共掺杂被认为是显著增强1.5μm附近发射强度的有效手段。除了对掺铋材料具有重要意义外，这也为提高基于铒的光学器件的性能指明了一条新途径。详细研究了Er3+→Bi能量转移的机制。调整两种物质之间的摩尔比为调整发射方案和进一步增加发射带宽提供了一种有效工具。
