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

LIU Enzhou; FAN Jun; HU Xiaoyun; HOU Wenqian; DAI Hongzhe

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

LIU Enzhou 1,FAN Jun 1 * #,HU Xiaoyun 2,HOU Wenqian 1,DAI Hongzhe 1

1.School of Chemical Engineering, Northwest University, Xi\'an 710069

2.Department of Physics, Northwest University, Xi\'an 710069

*Correspondence author

#Submitted by

Subject:

Funding: Specialized Research Fund for the Doctoral Program of Higher Education（No.No. 20096101110013）, Northwest University Graduate Cross-discipline Funds（No.Nos. 09YJC24 and 09YJC27）, National Natural Science Foundation of China （No.No. 20876125）

Opened online:18 June 2012

Accepted by: none

Citation: LIU Enzhou,FAN Jun,HU Xiaoyun.Visible to ultraviolet up-conversion in a novel rare earth-free up-converting phosphor[OL]. [18 June 2012] http://en.paper.edu.cn/en_releasepaper/content/4481790

A novel up-converting phosphor, NaxAlyFx+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 NaxAlyFx+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 NaxAlyFx+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.

Keywords:Up-converting phosphor; Luminescence properties; Fluorides; CaF2

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