Applied Optics Beijing Area Major Laboratory and Physics Department, Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University, Beijing, 100875, China.
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai, 201800, China.
Sci Rep. 2017 May 16;7(1):1976. doi: 10.1038/s41598-017-02244-8.
The multiphoton near-infrared, quantum cutting luminescence in Er/Tm co-doped telluride glass was studied. We found that the near-infrared 1800-nm luminescence intensity of (A) Er(8%)Tm(0.5%):telluride glass was approximately 4.4 to 19.5 times larger than that of (B) Tm(0.5%):telluride glass, and approximately 5.0 times larger than that of (C) Er(0.5%):telluride glass. Additionally, the infrared excitation spectra of the 1800 nm luminescence, as well as the visible excitation spectra of the 522 nm and 652 nm luminescence, of (A) Er(8%)Tm(0.5%):telluride glass are very similar to those of Er ions in (C) Er(0.5%):telluride glass, with respect to the shapes of their excitation spectral waveforms and peak wavelengths. Moreover, we found that there is a strong spectral overlap and energy transfer between the infrared luminescence of Er donor ions and the infrared absorption of Tm acceptor ions. The efficiency of this energy transfer {I(Er) → I(Er), H(Tm) → F(Tm)} between the Er and Tm ions is approximately 69.8%. Therefore, we can conclude that the observed behaviour is an interesting multiphoton, near-infrared, quantum cutting luminescence phenomenon that occurs in novel Er-Tm ion pairs. These findings are significant for the development of next-generation environmentally friendly germanium solar cells, and near-to-mid infrared (1.8-2.0 μm) lasers pumped by GaN light emitting diodes.
研究了掺铒/铥碲酸盐玻璃的多光子近红外量子剪裁发光。我们发现，（A）掺铒 8%、铥 0.5%：碲酸盐玻璃的近红外 1800nm 发光强度大约是（B）掺铥 0.5%：碲酸盐玻璃的 4.4 到 19.5 倍，大约是（C）掺铒 0.5%：碲酸盐玻璃的 5 倍。此外，（A）掺铒 8%、铥 0.5%：碲酸盐玻璃的 1800nm 发光红外激发光谱，以及 522nm 和 652nm 发光可见激发光谱，与（C）掺铒 0.5%：碲酸盐玻璃中铒离子的形状非常相似，其激发光谱波形和峰值波长也是如此。此外，我们发现，铒供体离子的红外发光与铥受体离子的红外吸收之间存在强烈的光谱重叠和能量转移。铒和铥离子之间的这种能量转移效率{I（Er）→I（Er），H（Tm）→F（Tm）}约为 69.8%。因此，我们可以得出结论，观察到的行为是一种有趣的多光子近红外量子剪裁发光现象，发生在新型的 Er-Tm 离子对中。这些发现对下一代环保的锗太阳能电池和 GaN 发光二极管泵浦的近中红外（1.8-2.0μm）激光器的发展具有重要意义。
