Document Detail

Room-temperature larger-scale highly ordered nanorod imprints of ZnO film.
MedLine Citation:
PMID:  24216906     Owner:  NLM     Status:  In-Data-Review    
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.
Zabu Kyaw; Wang Jianxiong; Kapil Dev; Swee Tiam Tan; Zhengang Ju; Zi-Hui Zhang; Yun Ji; Namig Hasanov; Wei Liu; Xiao Wei Sun; Hilmi Volkan Demir
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optics express     Volume:  21     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-11-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  26846-53     Citation Subset:  IM    
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