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

Yu Hsuan Hsiao; Cheng Ying Chen; Li Chuan Huang; Guan Jhong Lin; Der Hsien Lien; Jian Jang Huang; Jr Hau He

doi:10.1039/c3nr05226e

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

Yu Hsuan Hsiao, Cheng Ying Chen, Li Chuan Huang, Guan Jhong Lin, Der Hsien Lien, Jian Jang Huang, Jr Hau He^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

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.

Original language	English (US)
Pages (from-to)	2624-2628
Number of pages	5
Journal	Nanoscale
Volume	6
Issue number	5
DOIs	https://doi.org/10.1039/c3nr05226e
State	Published - Mar 7 2014
Externally published	Yes

ASJC Scopus subject areas

General Materials Science

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title = "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.",

author = "Hsiao, {Yu Hsuan} and Chen, {Cheng Ying} and Huang, {Li Chuan} and Lin, {Guan Jhong} and Lien, {Der Hsien} and Huang, {Jian Jang} and He, {Jr Hau}",

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T1 - Light extraction enhancement with radiation pattern shaping of LEDs by waveguiding nanorods with impedance-matching tips

AU - Hsiao, Yu Hsuan

AU - Chen, Cheng Ying

AU - Huang, Li Chuan

AU - Lin, Guan Jhong

AU - Lien, Der Hsien

AU - Huang, Jian Jang

AU - He, Jr Hau

PY - 2014/3/7

Y1 - 2014/3/7

N2 - 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.

AB - 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.

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

Abstract

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