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Open Access Nano Express

The correlation between radiative surface defect states and high color rendering index from ZnO nanotubes

Jamil R Sadaf1*, Muhammad Q Israr1, Omer Nur1, Magnus Willander1, Yong Ding2 and Zhong L Wang2

Author Affiliations

1 Department of Science and Technology, Campus Norrköping, Linköping University, SE-601 74 Norrköping, Sweden

2 School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245 USA

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Nanoscale Research Letters 2011, 6:513  doi:10.1186/1556-276X-6-513

Published: 30 August 2011

Abstract

Combined surface, structural and opto-electrical investigations are drawn from the chemically fashioned ZnO nanotubes and its heterostructure with p-GaN film. A strong correlation has been found between the formation of radiative surface defect states in the nanotubes and the pure cool white light possessing averaged eight color rendering index value of 96 with appropriate color temperature. Highly important deep-red color index value has been realized > 95 which has the capability to render and reproduce natural and vivid colors accurately. Diverse types of deep defect states and their relative contribution to the corresponding wavelengths in the broad emission band is suggested.

Keywords:
ZnO nanotubes; ZnO/GaN heterostructure; radiative surface defects; color rendering index; R9 color indexed