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State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
; Fax: +86-431-85168241-8325
; Tel: +86-431-85153853
Dalton Trans., 2013,42, 5159-5166
14 Nov 2012,
08 Jan 2013
First published online
10 Jan 2013
A series of Yb3+–Er3+ and Yb3+–Er3+–Tm3+ codoped LaOF nanocrystals were synthesized via a modified sol–gel Pechini method. The phases and morphologies as well as the luminescence properties of the as-prepared samples were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and upconversion luminescence (UCL) spectra, respectively. Under 980 nm near infrared (NIR) excitation, the UCL properties and the corresponding luminescent colors of the samples could be precisely modulated by changing the annealing temperatures, the dopant concentrations and the pump densities. By regulating the intensities of blue, green and red emissions in Yb3+–Er3+–Tm3+ codoped LaOF nanocrystals, an ideal white upconversion luminescence with chromaticity coordinates of (0.331, 0.368) is obtained in La0.885Yb0.1Er0.01Tm0.005OF nanocrystals for the first time. The blue, green and red components of the white light come from the 1G4 → 3H6 transition of Tm3+, 2H11/2/4S3/2 → 4I15/2 transitions of Er3+ and 4F9/2 → 4I15/2 transition of the Er3+ ions, respectively. The possible physical mechanisms involved in the different upconversion processes were discussed in detail.
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