Affiliation:
1. State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun 130012 P. R. China
2. State Key Laboratory of Superhard Materials Jilin University Changchun 130012 P. R. China
3. Centre for Advanced Optoelectronic Functional Materials Research Key Laboratory of UV‐Emitting Materials and Technology Ministry of Education Northeast Normal University Changchun 130024 P. R. China
4. College of Chemistry Jilin University Changchun 130021 P. R. China
Abstract
AbstractLocal structural engineering is an endogenous approach to modulate upconversion luminescence (UCL) from upstream to meet the needs of specific application scenarios. Herein, high pressure is utilized as a means to modulate the local structure, and the designed LiErF4:0.5%Tm3+@LiYF4 (Er:Tm@Y) nanoparticles with fast energy transfer rates, abundant cross‐relaxation processes, and multiple near‐infrared wavelengths (808, 980, 1530 nm) excitation properties are tailored as local structure‐sensitive hosts. A unique excitation wavelength‐dependent UCL enhancement of Er:Tm@Y upconversion nanoparticles is observed by pressure‐induced local structure distortions. When the pressure of ≈6 GPa is applied, the UCL is enhanced by a factor of 2.6 at 980 nm excitation only. After pressure release, the luminescence diminishes and recovers. Density functional theory calculations show that the symmetry distortion of the LiErF4 crystal reaches a maximum at pressurization to 6 GPa, while a new Er‐4f state emerges, greatly reducing the bandgap from 8.3 to 5.7 eV. Comparative experiments demonstrate that the local symmetry distortion caused by 0.5%Tm3+ doping and the different energy transfer patterns of Er3+ to Tm3+ at different excitations are responsible for this wavelength‐dependent luminescence enhancement.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Jilin Province
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献