Journal
CRYSTENGCOMM
Volume 20, Issue 43, Pages 6919-6924Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ce01340c
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Funding
- National Key R&D Program of China [2018YFB1107200]
- National Natural Science Foundation of China [61404071, 61575091, 61675094, 51132004, 51072054, 51102209, 51472091, 51772270, 51471082]
- Key projects of Henan Provincial Education Department [16A140029, 14B40010]
- National Basic Research Program of China [2011CB808100]
- Natural Science Foundation of Henan Province of China [162300410201]
- Henan Provincial Department of Science and Technology Research Project [162102210303]
- Fundamental and Cutting-edge Technology Research Program of Henan Province [152300410218]
- Key scientific research projects of Henan Province [16A140014, 16A140016]
- Program for Young Teachers of Higher School in Henan Province [2013GGJS-153]
- Program for Innovation talents (in Science and Technology) in University of Henan Province [16HASTIT044]
- Youth backbone teacher training program in Henan province Open funds of State Key Laboratory of Precision Spectroscopy, East China Normal University [2017GGJS137]
- State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
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NaGdF4 is considered to be one of the efficient hosts for up-conversion (UC) materials; in particular, rare earth-doped hexagonal-phase NaGdF4 exhibits strong upconversion luminescence. However, thin films of NaGdF4 are difficult to prepare by conventional methods due to the presence of fluorine, and hexagonal-phase NaGdF4 cannot be obtained easily at low temperatures. Herein, a thin film of hexagonal-phase NaGdF4:Yb-Er is fabricated by electro-deposition at moderate temperatures. More importantly, the phase of NaGdF4:Yb-Er thin film can be controlled to enhance upconversion luminescence by adding polyvinylpyrrolidone (PVP) in the electrolyte. Upon excitation using a 980 nm diode laser, the UC emission intensity of hexagonal thin films increases significantly compared with that of cubic films. The results pave a new way to control the phase of fluoride crystal films that may find potential applications in photovoltaic devices.
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