Enhanced light-extraction from hierarchical surfaces consisting of p-GaN microdomes and SiO2 nanorods for GaN-based light-emitting diodes

Cheng-Han Ho; Yu-Hsuan Hsiao; Der-Hsien Lien; M. S. Tsai; Don Chang; Kun-Yu Lai; Ching-Cherng Sun; Jr-Hau He

doi:10.1063/1.4824848

Enhanced light-extraction from hierarchical surfaces consisting of p-GaN microdomes and SiO₂ nanorods for GaN-based light-emitting diodes

Cheng-Han Ho, Yu-Hsuan Hsiao, Der-Hsien Lien, M. S. Tsai, Don Chang, Kun-Yu Lai, Ching-Cherng Sun, Jr-Hau He^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

22 Citations (Scopus)

Abstract

We report an efficient light-extraction scheme employing the hierarchical structure, p-GaN microdomes/SiO₂ nanorods (NRs), on GaN light-emitting diodes (LEDs). Compared with the flat LED, the LEDs with hierarchical surfaces exhibits a light-output improvement of 36.8%. The considerable enhancement in light-extraction efficiency is attributed to the multiple tilted surfaces of microdomes and the graded refractive indexes provided by the SiO₂ NRs, reducing total internal reflection and Fresnel reflection. The enhanced optical performances are supported by the finite-difference time-domain analysis. Advances in light extraction scheme employing hierarchical structures demonstrated here pave the way to solid-state lighting technology.

Original language	English
Article number	161104
Journal	Applied Physics Letters
Volume	103
Issue number	16
Online published	14 Oct 2013
DOIs	https://doi.org/10.1063/1.4824848
Publication status	Published - 14 Oct 2013
Externally published	Yes

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@article{c466e48cb40943bd936fe99d354dc172,

title = "Enhanced light-extraction from hierarchical surfaces consisting of p-GaN microdomes and SiO2 nanorods for GaN-based light-emitting diodes",

abstract = "We report an efficient light-extraction scheme employing the hierarchical structure, p-GaN microdomes/SiO2 nanorods (NRs), on GaN light-emitting diodes (LEDs). Compared with the flat LED, the LEDs with hierarchical surfaces exhibits a light-output improvement of 36.8%. The considerable enhancement in light-extraction efficiency is attributed to the multiple tilted surfaces of microdomes and the graded refractive indexes provided by the SiO2 NRs, reducing total internal reflection and Fresnel reflection. The enhanced optical performances are supported by the finite-difference time-domain analysis. Advances in light extraction scheme employing hierarchical structures demonstrated here pave the way to solid-state lighting technology.",

author = "Cheng-Han Ho and Yu-Hsuan Hsiao and Der-Hsien Lien and Tsai, {M. S.} and Don Chang and Kun-Yu Lai and Ching-Cherng Sun and Jr-Hau He",

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volume = "103",

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Enhanced light-extraction from hierarchical surfaces consisting of p-GaN microdomes and SiO₂ nanorods for GaN-based light-emitting diodes. / Ho, Cheng-Han; Hsiao, Yu-Hsuan; Lien, Der-Hsien et al.
In: Applied Physics Letters, Vol. 103, No. 16, 161104, 14.10.2013.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

TY - JOUR

T1 - Enhanced light-extraction from hierarchical surfaces consisting of p-GaN microdomes and SiO2 nanorods for GaN-based light-emitting diodes

AU - Ho, Cheng-Han

AU - Hsiao, Yu-Hsuan

AU - Lien, Der-Hsien

AU - Tsai, M. S.

AU - Chang, Don

AU - Lai, Kun-Yu

AU - Sun, Ching-Cherng

AU - He, Jr-Hau

PY - 2013/10/14

Y1 - 2013/10/14

N2 - We report an efficient light-extraction scheme employing the hierarchical structure, p-GaN microdomes/SiO2 nanorods (NRs), on GaN light-emitting diodes (LEDs). Compared with the flat LED, the LEDs with hierarchical surfaces exhibits a light-output improvement of 36.8%. The considerable enhancement in light-extraction efficiency is attributed to the multiple tilted surfaces of microdomes and the graded refractive indexes provided by the SiO2 NRs, reducing total internal reflection and Fresnel reflection. The enhanced optical performances are supported by the finite-difference time-domain analysis. Advances in light extraction scheme employing hierarchical structures demonstrated here pave the way to solid-state lighting technology.

AB - We report an efficient light-extraction scheme employing the hierarchical structure, p-GaN microdomes/SiO2 nanorods (NRs), on GaN light-emitting diodes (LEDs). Compared with the flat LED, the LEDs with hierarchical surfaces exhibits a light-output improvement of 36.8%. The considerable enhancement in light-extraction efficiency is attributed to the multiple tilted surfaces of microdomes and the graded refractive indexes provided by the SiO2 NRs, reducing total internal reflection and Fresnel reflection. The enhanced optical performances are supported by the finite-difference time-domain analysis. Advances in light extraction scheme employing hierarchical structures demonstrated here pave the way to solid-state lighting technology.

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