Abstract Yb3+-doped oxyfluoride glasses and glass ceramics containing KZnF3 nanocrystals were obtained by melt-quenching. Under excitation of a 980 nm laser, a strong blue emission from Yb3+-Yb3+ cooperative upconversion was observed in the glass sample, which increased by five times in glass ceramics after heat treatment for 20 h. The photoluminescence mechanism and sample properties were investigated by X-ray diffraction, transmission electron microscopy, fluorescent lifetime, absorption and emission spectra. The size of KZnF3 nanocrystals is in the range 5 nm–20 nm, making the glass ceramic samples highly transparent. The STEM-EDS measurements indicate that the distribution of Yb is consistent with that of the KZnF3 nanocrystals. Fluroide phase provides a low-phonon-energy environment for Yb3+-Yb3+ ion pairs, which facilitates an intense fluorescent blue emission in the KZnF3 crystal lattice. Both theoretical and experimental results demonstrate that Yb3+-doped oxyfluoride glasses and glass ceramics containing KZnF3 nanocrystals are promising materials for blue upconversion emission.

中文翻译：

---

Yb3+-Yb3+ 在氟氧化物玻璃和玻璃陶瓷中协同上转换

摘要 通过熔融淬火获得了掺Yb3+的氟氧化物玻璃和含有KZnF3纳米晶的玻璃陶瓷。在 980 nm 激光激发下，在玻璃样品中观察到来自 Yb3+-Yb3+ 协同上转换的强烈蓝色发射，热处理 20 小时后在玻璃陶瓷中增加了 5 倍。通过X射线衍射、透射电子显微镜、荧光寿命、吸收和发射光谱研究了光致发光机制和样品性质。KZnF3 纳米晶体的尺寸在 5 nm-20 nm 范围内，使玻璃陶瓷样品具有高度透明性。STEM-EDS 测量表明 Yb 的分布与 KZnF3 纳米晶体的分布一致。氟化物相为 Yb3+-Yb3+ 离子对提供低声子能量环境，这有助于在 KZnF3 晶格中发出强烈的蓝色荧光。理论和实验结果都表明，掺 Yb3+ 的氟氧化物玻璃和含有 KZnF3 纳米晶体的玻璃陶瓷是有前途的蓝色上转换发射材料。