The correlation between radiative surface defect states and high color rendering index from ZnO nanotubes
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
Nanoscale Research Letters 2011, 6:513 doi:10.1186/1556-276X-6-513Published: 30 August 2011
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.