Citation: En Zhou Liu, Jun Fan, Xiao Yun Hu, Wen Qian Hou, Hong Zhe Dai. Visible to ultraviolet up-conversion in a novel rare earth-free up-converting phosphor[J]. Chinese Chemical Letters, ;2012, 23(1): 117-120. doi: 10.1016/j.cclet.2011.09.026 shu

Visible to ultraviolet up-conversion in a novel rare earth-free up-converting phosphor

a School of Chemical Engineering, Northwest University, Xi'an 710069, China;
b Department of Physics, Northwest University, Xi'an 710069, China

Received Date: 14 June 2011

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 20876125), the Research Fund for the Doctoral Program of Higher Education (No. 20096101110013), and Northwest University Graduate Cross-discipline Funds (Nos. 09YJC24 and 09YJC27).

A novel up-converting phosphor, Na_xAl,_yF_x+3y/CaF₂ (0.3 < x < 0.5, 0 < y < 0.1) composite, is prepared by a hydrothermal process at 180℃ and an annealing treatment at 500℃. X-ray diffraction (XRD) pattern indicates that Na_xAl_yF_x+3y/CaF₂ is a composite consisting of NaF, Na₃AlF₆, and CaF₂. The up-conversion luminescence properties of this phosphor are investigated by fluorescence spectrometer. Results show that Na_xAl_yF_x+3y/CaF₂ exhibits visible-to-ultraviolet up-conversion luminescence properties. The emission peaks at 316 and 336 nm are observed when excited by 610 nm, the luminescence lifetime of the emissions is great than 18 ms, and the internal fluorescence quantum yield is 4.2%. Additionally, the luminescent mechanism of this phosphor is also mentioned.
- Up-converting phosphor,
- Luminescence properties,
- Fluorides,
- CaF₂
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