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나노 구조 물리 연구단
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Optimal length of ZnO nanorods for improving the light-extraction efficiency of blue InGaN light-emitting diodes

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Title
Optimal length of ZnO nanorods for improving the light-extraction efficiency of blue InGaN light-emitting diodes
Author(s)
Hyun Jeong; Rafael Salas-Montiel; Mun Seok Jeong
Publication Date
2015-09
Journal
OPTICS EXPRESS, v.23, no.18, pp.23195 - 23207
Publisher
OPTICAL SOC AMER
Abstract
Optimal length of ZnO nanorods (NRs) on blue InGaN lightemitting diodes (LEDs) was investigated to improve the light-extraction efficiency (LEE) of the LED. X-ray diffraction, photoluminescence spectroscopy, and micro-Raman spectroscopy were employed to determine the structural and optical properties of the ZnO NRs with length of 300 nm and 5 μm grown by a hydrothermal method. From the conventional light output power versus injection current (L-I) measurement, we found that the light output power of the LEDs with 300-nm- and 5-μm-long ZnO NRs was approximately 14.6% and 40.7% greater, respectively, than that of the LED without the ZnO NRs at an operating current of 20 mA. In addition, there were almost no changes to the electrical properties of the ZnO-NR-coated LEDs. The effect of the length of the ZnO NRs on the LEE of the LEDs was theoretically verified with three-dimensional finite-difference timedomain (FDTD) analysis. The FDTD images of the optical power and farfield radiation patterns of the LEDs showed that more photons were guided to the out of the LED by the longer ZnO NRs than by the shorter ZnO NRs grown on the LEDs.
URI
https://pr.ibs.re.kr/handle/8788114/1888
ISSN
1094-4087
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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