White Electroluminescence Using ZnO Nanotubes/GaN Heterostructure Light-Emitting Diode

We report the fabrication of heterostructure white light–emitting diode (LED) comprised of n-ZnO nanotubes (NTs) aqueous chemically synthesized on p-GaN substrate. Room temperature electroluminescence (EL) of the LED demonstrates strong broadband white emission spectrum consisting of predominating p...

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Bibliographic Details
Published in:Nanoscale research letters 2010-04, Vol.5 (6), p.957-960
Main Authors: Sadaf, JR, Israr, MQ, Kishwar, S, Nur, O, Willander, M
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Electroluminescence
Light-emitting diodes
Lightning
Materials Science
Molecular Medicine
Nano Express
Nanochemistry
Nanoscale Science and Technology
Nanotechnology
Nanotechnology and Microengineering
TECHNOLOGY
TEKNIKVETENSKAP
White light sources
ZnO nanotubes
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Summary:We report the fabrication of heterostructure white light–emitting diode (LED) comprised of n-ZnO nanotubes (NTs) aqueous chemically synthesized on p-GaN substrate. Room temperature electroluminescence (EL) of the LED demonstrates strong broadband white emission spectrum consisting of predominating peak centred at 560 nm and relatively weak violet–blue emission peak at 450 nm under forward bias. The broadband EL emission covering the whole visible spectrum has been attributed to the large surface area and high surface states of ZnO NTs produced during the etching process. In addition, comparison of the EL emission colour quality shows that ZnO nanotubes have much better quality than that of the ZnO nanorods. The colour-rendering index of the white light obtained from the nanotubes was 87, while the nanorods-based LED emit yellowish colour.
ISSN:1931-7573
1556-276X
DOI:10.1007/s11671-010-9588-z