光子上转换
材料科学
激光阈值
纳米颗粒
紫外线
激发
兴奋剂
光电子学
等结构
纳米结构
离子
纳米技术
红外线的
发射光谱
谱线
光学
化学
波长
结晶学
物理
晶体结构
有机化学
量子力学
天文
作者
Xian Chen,Limin Jin,Tianying Sun,Weijian Kong,Siu Fung Yu,Feng Wang
出处
期刊:Small
[Wiley]
日期:2017-07-19
卷期号:13 (43): 1701479-1701479
被引量:49
标识
DOI:10.1002/smll.201701479
摘要
One major challenge in upconversion research is to develop new materials and structures to expand the emission spectrum. Herein, a heterogeneous core-shell-shell nanostructure of NaYbF4 :Gd/Tm@NaGdF4 @CaF2 :Ce is developed to realize efficient photon upconversion in Ce3+ ions through a Gd-mediated energy migration process. The design takes advantage of CaF2 host that reduces the 4f-5d excitation frequency of Ce3+ to match the emission line of Gd3+ . Meanwhile, CaF2 is isostructural with NaGdF4 and can form a continuous crystalline lattice with the core layer. As a result, effective Yb3+ → Tm3+ → Gd3+ → Ce3+ energy transfer can be established in a single nanoparticle. This effect enables efficient ultraviolet emission of Ce3+ following near infrared excitation into the core layer. The Ce3+ upconversion emission achieved in the core-shell-shell nanoparticles features broad bandwidth and long lifetime, which offers exciting opportunities of realizing tunable lasing emissions in the ultraviolet spectral region.
科研通智能强力驱动
Strongly Powered by AbleSci AI