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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 26846–26853

Room-temperature larger-scale highly ordered nanorod imprints of ZnO film

Zabu Kyaw, Wang Jianxiong, Kapil Dev, Swee Tiam Tan, Zhengang Ju, Zi-Hui Zhang, Yun Ji, Namig Hasanov, Wei Liu, Xiao Wei Sun, and Hilmi Volkan Demir  »View Author Affiliations

Optics Express, Vol. 21, Issue 22, pp. 26846-26853 (2013)

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Room-temperature large-scale highly ordered nanorod-patterned ZnO films directly integrated on III-nitride light-emitting diodes (LEDs) are proposed and demonstrated via low-cost modified nanoimprinting, avoiding a high-temperature process. with a 600 nm pitch on top of a critical 200 nm thick Imprinting ZnO nanorods of 200 nm in diameter and 200 nm in height continuous ZnO wetting layer, the light output power of the resulting integrated ZnO-nanorod-film/semi-transparent metal/GaN/InGaN LED shows a two-fold enhancement (100% light extraction efficiency improvement) at the injection current of 150 mA, in comparison with the conventional LED without the imprint film. The increased optical output is well explained by the enhanced light scattering and outcoupling of the ZnO-rod structures along with the wetting film, as verified by the numerical simulations. The wetting layer is found to be essential for better impedance matching. The current-voltage characteristics and electroluminescence measurements confirm that there is no noticeable change in the electrical or spectral properties of the final LEDs after ZnO-nanorod film integration. These results suggest that the low-cost high-quality large-scale ZnO-nanorod imprints hold great promise for superior LED light extraction.

© 2013 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Optical Devices

Original Manuscript: August 8, 2013
Revised Manuscript: September 23, 2013
Manuscript Accepted: October 9, 2013
Published: October 30, 2013

Zabu Kyaw, Wang Jianxiong, Kapil Dev, Swee Tiam Tan, Zhengang Ju, Zi-Hui Zhang, Yun Ji, Namig Hasanov, Wei Liu, Xiao Wei Sun, and Hilmi Volkan Demir, "Room-temperature larger-scale highly ordered nanorod imprints of ZnO film," Opt. Express 21, 26846-26853 (2013)

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