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Article
Spectral Modulation through Controlling Anions in Nanocaged Phosphors
Journal of Materials Chemistry C
  • Hongyu Bian, Northeast Normal University
  • Yuxue Liu, Northeast Normal University
  • Duanting Yan, Northeast Normal University
  • Hancheng Zhu, Northeast Normal University
  • Chunguang Liu, Northeast Normal University
  • Changshan Xu, Northeast Normal University
  • Yichun Liu, Northeast Normal University
  • Hong Zhang, University of Amsterdam
  • Xiao-Jun Wang, Georgia Southern University
Document Type
Article
Publication Date
1-1-2013
DOI
10.1039/C3TC31446D
Disciplines
Abstract

A new approach has been proposed and validated to modulate the emission spectra of europium-doped 12CaO·7Al2O3 phosphors by tuning the nonradiative and radiative transition rates, realized by controlling the sort and amount of the encaged anions. A single wavelength at 255 nm can excite simultaneously Eu2+ and Eu3+ centres to yield blue and red emissions, respectively. The amount of the anions in the nanocages, like OH− and H−, can be controlled by heat treatment processes. The existence of encaged OH− accelerates the nonradiative process of the emission centres, while the presence of encaged H− induces a higher symmetry that decreases the radiative transition rate, confirmed by the analysis of decay processes. It is demonstrated that the emission colour is tuned finely from red to blue with the CIE chromaticity coordinates from (0.630, 0.352) to (0.216, 0.086) when the annealing time increases. This strategy can be readily extended to similar systems with other rare earth active centres.

Comments

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Citation Information
Hongyu Bian, Yuxue Liu, Duanting Yan, Hancheng Zhu, et al.. "Spectral Modulation through Controlling Anions in Nanocaged Phosphors" Journal of Materials Chemistry C Vol. 1 Iss. 47 (2013) p. 7896 - 7903
Available at: http://works.bepress.com/xiao-jun_wang/41/