Issue 45, 2012
From the journal:

Journal of Materials Chemistry

Photoluminescence properties of Yb2+ in CaAlSiN3 as a novel red-emitting phosphor for white LEDs

Zhijun Zhang,ab   Otmar M. ten Kate,ac   Anneke C. A. Delsing,a   Marjo J. H. Stevens,a   Jingtai Zhao,b   Peter H. L. Notten,a   Pieter Dorenbosc  and  Hubertus T. Hintzen*a  

* Corresponding authors

a Energy Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
E-mail: h.t.hintzen@tue.nl

b Key Laboratory of Transparent Opto-Functional Inorganic Materials of Chinese Academy of Sciences, Shanghai Institute of Ceramics, Shanghai, P. R. China

c Luminescent Materials Research Group, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands

Abstract

This paper reports on the diffuse reflection spectra, photoluminescence spectra and chromaticity of ytterbium in CaAlSiN3 at room temperature. It can be excited efficiently over a broad spectral range between 280 and 580 nm and exhibits a single intense red emission at 629 nm with a full width at half maximum of 75 nm due to the electronic transitions from the excited state of 4f135d to the ground state 4f14 of Yb2+. The low energy of Yb2+ emission in CaAlSiN3 can be attributed to the large nephelauxetic effect and crystal field splitting due to the coordination of Yb2+ by nitrogen. This novel developed CaAlSiN3:Yb2+, which is the first Yb2+-activated nitride red-emitting phosphor, has potential applications in spectral conversion materials for warm-white LEDs. The width of the emission band, Stokes shift and thermal quenching mechanism of Yb2+ in CaAlSiN3 and (oxy)nitride-based phosphors are discussed and compared with those of Eu2+.

Graphical abstract: Photoluminescence properties of Yb2+ in CaAlSiN3 as a novel red-emitting phosphor for white LEDs

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Article information

DOI
https://doi.org/10.1039/C2JM35170F
Article type
Paper
Submitted
02 Aug 2012
Accepted
27 Sep 2012
First published
27 Sep 2012

J. Mater. Chem., 2012,22, 23871-23876

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Photoluminescence properties of Yb2+ in CaAlSiN3 as a novel red-emitting phosphor for white LEDs

Z. Zhang, O. M. ten Kate, A. C. A. Delsing, M. J. H. Stevens, J. Zhao, P. H. L. Notten, P. Dorenbos and H. T. Hintzen, J. Mater. Chem., 2012, 22, 23871 DOI: 10.1039/C2JM35170F

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