Abstract Y2O3:Er3+ translucent ceramics was fabricated with addition of La(OH)3 nanopowder as a sintering aid. The influence of La(OH)3 addition on the microstructure, transmittance and upconversion luminescence of Y2O3:Er3+ ceramics was investigated in detail. The results show that the ceramics sample with 5 mol % La(OH)3 additives exhibits finer microstructure with fewer pores and higher optical transmittance than others. It was proved that La(OH)3 additives could greatly reduce the porosity and improve the transparency of Y2O3:Er3+ ceramics. By using a 980 nm diode laser as a pumping source, the Y2O3:Er3+ ceramics gave bright visible upconversion luminescence, which was ascribed to the radiative transitions of 2H11/2,4S3/2 →4I15/2 and 4F9/2 →4I15/2 of Er3+ ions, respectively. The possible upconversion mechanism has been proposed accordingly.

中文翻译：

---

Y2O3:Er3+半透明陶瓷的显微结构、透射率和上转换发光

摘要 添加La(OH)3纳米粉体作为烧结助剂，制备了Y2O3:Er3+半透明陶瓷。详细研究了La(OH)3添加对Y2O3:Er3+陶瓷微观结构、透射率和上转换发光的影响。结果表明，含有 5 mol% La(OH)3 添加剂的陶瓷样品比其他陶瓷样品具有更精细的微观结构、更少的孔隙和更高的透光率。证明La(OH)3添加剂可以大大降低Y2O3:Er3+陶瓷的孔隙率和提高其透明度。通过使用 980 nm 二极管激光器作为泵浦源，Y2O3:Er3+ 陶瓷产生明亮的可见上转换发光，这归因于 2H11/2、4S3/2 →4I15/2 和 4F9/2 →4I15/2 的辐射跃迁分别为 Er3+ 离子。相应地提出了可能的上转换机制。