Issue 5, 2014

Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips

Abstract

Syringe-like ZnO nanorods (NRs) were fabricated on InGaN/GaN light emitting diodes (LEDs) by a hydrothermal method. Without sacrificing the electrical performances of LEDs, syringe-like NRs can enhance light extraction capability by 10.5% at 20 mA and shape the radiation profile with a view angle collimated from 136° to 121°. By performing optical experiments and simulation, it is found that the superior light extraction efficiency with a more collimated radiation pattern is attributed to the waveguiding effect of NRs and the mitigation of abrupt index change by the tapered ends of syringe-like ZnO NRs. This work demonstrates the importance of the nanostructure morphology in LED performances and provides the architecture design guidelines of nanostructures to a variety of optical devices.

Graphical abstract: Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips

Supplementary files

Article information

Article type
Paper
Submitted
07 Oct 2013
Accepted
18 Nov 2013
First published
26 Nov 2013

Nanoscale, 2014,6, 2624-2628

Author version available

Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips

Y. Hsiao, C. Chen, L. Huang, G. Lin, D. Lien, J. Huang and J. He, Nanoscale, 2014, 6, 2624 DOI: 10.1039/C3NR05226E

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