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: Contribution to journal › Article › peer-review

22 Scopus citations

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 (US)
Article number	161104
Journal	Applied Physics Letters
Volume	103
Issue number	16
DOIs	https://doi.org/10.1063/1.4824848
State	Published - Oct 14 2013
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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

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

Abstract

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