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Journal of Nanomaterials
Volume 2014 (2014), Article ID 979875, 7 pages
http://dx.doi.org/10.1155/2014/979875
Research Article

Fractional Contributions of Defect-Originated Photoluminescence from CuInS2/ZnS Coreshells for Hybrid White LEDs

1Department of Physics, Advanced Center for Laser Science and Spectroscopy, Hampton University, Hampton, VA 23668, USA
2Department of Cell Biology and Immunology, Center for Fluorescence Technologies and Nanomedicine, University of North Texas Health Science Center, Fort Worth, TX 76107, USA
3Department of Physics and Astronomy, Texas Christian University, Fort Worth, TX 76129, USA
4Department of Chemistry, Key Laboratory for Advanced Materials, East China University of Science and Technology, Shanghai 200237, China

Received 27 July 2014; Revised 10 September 2014; Accepted 10 September 2014; Published 22 October 2014

Academic Editor: Ruibing Wang

Copyright © 2014 Quinton Rice et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The wide optical tunability and broad spectral distribution of CuInS2/ZnS (CIS/ZnS) coreshells are key elements for developing the hybrid white light emitting diodes where the nanoparticles are stacked on the blue LEDs. Two and coreshells are utilized for the hybrid white LED development. The time-resolved spectroscopy of and reveals the correlation between the fast, intermediate, and slow decay components and the interface-trapped state and shallow- and deep-trapped states, although the fractional amplitudes of photoluminescence (PL) decay components are widely distributed throughout the entire spectra. The temperature-resolved spectroscopy explains that the PL from deep-trapped donor-acceptor (DA) state has relatively large thermal quenching, due to the relative Coulomb interaction of DA pairs, compared to the thermal quenching of PL from interface defect state and shallow-trapped DA state. A good spectral coupling between the blue diode excitation and the PL from CIS/ZnS leads to the realization of hybrid white LEDs.