Abstract In this paper, the upconversion/downconversion (UC/DC), visible (VIS) and near-infrared (NIR) emissions of Cr3+/Yb3+ co-doped TeO2–ZnO–La2O3 (TZL) tellurite glasses under different wavelength excitation lights were investigated. The CIE 1931 chromaticity coordinates for UC emission of Cr3+/Yb3+ co-doped TZL tellurite glasses under different excitation wavelengths were also investigated. Through the energy transfer (ET) and cooperative energy transfer (CET) processes from Cr3+ to Yb3+ and the combination of Cr3+-Yb3+ lead to the intensity of UC-, DC-, VIS-, NIR-emissions of Cr3+/Yb3+ co-doped TZL tellurite glasses significantly increased. Under different wavelength excitation lights, the optimal concentration of Yb3+ for the UC-, DC-, and VIS- emissions of Cr3+/Yb3+ co-doped TZL tellurite glasses is different. In addition, the ET, CET processes between Cr3+ and Yb3+ are also proposed and discussed.

中文翻译：

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Cr3+/Yb3+共掺杂TeO2-ZnO-La2O3碲酸盐玻璃在不同波长激发光下的能量传递和光谱特性

摘要 本文研究了 Cr3+/Yb3+ 共掺杂 TeO2–ZnO–La2O3 (TZL) 碲酸盐玻璃在不同波长激发光下的上转换/下转换 (UC/DC)、可见光 (VIS) 和近红外 (NIR) 发射。调查。还研究了在不同激发波长下 Cr3+/Yb3+ 共掺杂 TZL 碲酸盐玻璃的 UC 发射的 CIE 1931 色度坐标。通过从Cr3+到Yb3+的能量转移（ET）和协同能量转移（CET）过程以及Cr3+-Yb3+的结合导致Cr3+/Yb3+共掺杂的UC-、DC-、VIS-、NIR-发射强度TZL碲酸盐玻璃显着增加。在不同波长激发光下，Cr3+/Yb3+共掺杂TZL亚碲酸盐玻璃UC-、DC-和VIS-发射的Yb3+最佳浓度不同。此外，ET、