Issue 17, 2011
From the journal:

Journal of Materials Chemistry

Generation of broadband emission by incorporating N3− into Ca3Sc2Si3O12 : Ce3+ garnet for high rendering white LEDs

Yongfu Liu,ab   Xia Zhang,a   Zhendong Hao,a   Xiaojun Wangc  and  Jiahua Zhang*a  

* Corresponding authors

a Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun, China
E-mail: zhangjh@ciomp.ac.cn
Fax: +86-0431-86708875
Tel: +86-0431-86708875

b Graduate School of Chinese Academy of Sciences, Beijing, China

c Department of Physics, Georgia Southern University, Statesboro, Georgia, USA

Abstract

Adding Si3N4 into green emitting Ca3Sc2Si3O12 : Ce3+ garnet phosphor generates an additionally red emission band peaking around 610 nm that are assigned to Ce3+ ions having N3− in their local coordination. The excitation spectrum of the red band consists of not only a distinct band at 510 nm of itself but also an intense blue band at 450 nm that belongs to the typical Ce3+ ions with green emission, indicating a notable energy transfer from the green emitting Ce3+ ions to the red ones. The energy transfer significantly enables the achievement of a broad emission spectrum covering a red and green spectral region suitable for generating white light upon a blue light-emitting diode (LED) excitation. The decay patterns of the red and green fluorescence are discussed in relation to the effect of energy transfer. A white LED with high color rendering of 86 and low correlated color temperature of 4700 K is fabricated using the present single garnet phosphor.

Graphical abstract: Generation of broadband emission by incorporating N3− into Ca3Sc2Si3O12 : Ce3+ garnet for high rendering white LEDs

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Article information

DOI
https://doi.org/10.1039/C0JM04404K
Article type
Paper
Submitted
16 Dec 2010
Accepted
28 Feb 2011
First published
22 Mar 2011

J. Mater. Chem., 2011,21, 6354-6358

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Generation of broadband emission by incorporating N3− into Ca3Sc2Si3O12 : Ce3+ garnet for high rendering white LEDs

Y. Liu, X. Zhang, Z. Hao, X. Wang and J. Zhang, J. Mater. Chem., 2011, 21, 6354 DOI: 10.1039/C0JM04404K

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