Abstract

Broadband near-infrared downconversion is achieved in transparent glass ceramics containing Bi³⁺/Yb³⁺:LaF₃ nanocrystals, which involves emitting two near-infrared photons by downconversion one incident ultraviolet photon via cooperative energy transfer. The X-ray diffraction patterns and scanning electron microscope images are recorded to demonstrate the morphology and distribution of LaF₃ nanocrystals. The dependence of fluorescence spectra and decay lifetimes on Yb³⁺-doped concentrations is examined to verify the energy transfer mechanism. Further, the quantum efficiency is estimated and the maximal value is close to be 155.4%.

中文翻译：

---

含LaF 3纳米晶体的Bi 3+ -Yb 3+掺杂的透明玻璃陶瓷中的宽带下变频

摘要

在包含Bi ³⁺ / Yb ³⁺：LaF ₃纳米晶体的透明玻璃陶瓷中实现了宽带近红外下转换，这涉及通过协同能量转移将一个入射的紫外光子下转换来发射两个近红外光子。记录X射线衍射图和扫描电子显微镜图像以证明LaF ₃纳米晶体的形态和分布。研究了荧光光谱和衰变寿命对Yb ³⁺掺杂浓度的依赖性，以验证能量转移机理。此外，估计了量子效率并且最大值接近于155.4％。