Exciton localization and optical properties improvement in nanocrystal-embedded ZnO core-shell nanowires

Rui Chen; Quan Lin Ye; Tingchao He; Van Duong Ta; Yongjun Ying; Yee Yan Tay; Tom Wu; Handong Sun

doi:10.1021/nl304433m

Exciton localization and optical properties improvement in nanocrystal-embedded ZnO core-shell nanowires

Rui Chen, Quan Lin Ye, Tingchao He, Van Duong Ta, Yongjun Ying, Yee Yan Tay, Tom Wu^*, Handong Sun

^*Corresponding author for this work

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

87 Scopus citations

Abstract

We present a comparative investigation of the morphological, structural, and optical properties of vertically aligned ZnO nanowires (NWs) before and after high energy argon ion (Ar⁺) milling. It is found that the outer regions of the as-grown sample change from crystalline to amorphous, and ZnO core-shell NWs with ZnO nanocrystals embedded are formed after Ar⁺ milling. Optical properties of the ZnO NWs have been investigated systematically through power and temperature dependent photoluminescence measurements, and the phenomenon of exciton localization as well as the relevant favorable photoluminescence characteristics is elucidated. Interestingly, under high density optical pumping at room temperature, coherent random lasing action is observed, which is ascribed to exciton localization and strong scattering. Our results on the unique optical properties of localized exciton in ZnO core-shell nanostructures shed light on developing stable and high-efficiency excitonic optoelectronic devices such as light-emitting diodes and lasers.

Original language	English (US)
Pages (from-to)	734-739
Number of pages	6
Journal	Nano Letters
Volume	13
Issue number	2
DOIs	https://doi.org/10.1021/nl304433m
State	Published - Feb 13 2013
Externally published	Yes

Keywords

ZnO
exciton
localization
photoluminescence
random lasing

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl304433m

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title = "Exciton localization and optical properties improvement in nanocrystal-embedded ZnO core-shell nanowires",

abstract = "We present a comparative investigation of the morphological, structural, and optical properties of vertically aligned ZnO nanowires (NWs) before and after high energy argon ion (Ar+) milling. It is found that the outer regions of the as-grown sample change from crystalline to amorphous, and ZnO core-shell NWs with ZnO nanocrystals embedded are formed after Ar+ milling. Optical properties of the ZnO NWs have been investigated systematically through power and temperature dependent photoluminescence measurements, and the phenomenon of exciton localization as well as the relevant favorable photoluminescence characteristics is elucidated. Interestingly, under high density optical pumping at room temperature, coherent random lasing action is observed, which is ascribed to exciton localization and strong scattering. Our results on the unique optical properties of localized exciton in ZnO core-shell nanostructures shed light on developing stable and high-efficiency excitonic optoelectronic devices such as light-emitting diodes and lasers.",

keywords = "ZnO, exciton, localization, photoluminescence, random lasing",

author = "Rui Chen and Ye, {Quan Lin} and Tingchao He and Ta, {Van Duong} and Yongjun Ying and Tay, {Yee Yan} and Tom Wu and Handong Sun",

year = "2013",

month = feb,

day = "13",

doi = "10.1021/nl304433m",

language = "English (US)",

volume = "13",

pages = "734--739",

journal = "Nano Letters",

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T1 - Exciton localization and optical properties improvement in nanocrystal-embedded ZnO core-shell nanowires

AU - Chen, Rui

AU - Ye, Quan Lin

AU - He, Tingchao

AU - Ta, Van Duong

AU - Ying, Yongjun

AU - Tay, Yee Yan

AU - Wu, Tom

AU - Sun, Handong

PY - 2013/2/13

Y1 - 2013/2/13

N2 - We present a comparative investigation of the morphological, structural, and optical properties of vertically aligned ZnO nanowires (NWs) before and after high energy argon ion (Ar+) milling. It is found that the outer regions of the as-grown sample change from crystalline to amorphous, and ZnO core-shell NWs with ZnO nanocrystals embedded are formed after Ar+ milling. Optical properties of the ZnO NWs have been investigated systematically through power and temperature dependent photoluminescence measurements, and the phenomenon of exciton localization as well as the relevant favorable photoluminescence characteristics is elucidated. Interestingly, under high density optical pumping at room temperature, coherent random lasing action is observed, which is ascribed to exciton localization and strong scattering. Our results on the unique optical properties of localized exciton in ZnO core-shell nanostructures shed light on developing stable and high-efficiency excitonic optoelectronic devices such as light-emitting diodes and lasers.

AB - We present a comparative investigation of the morphological, structural, and optical properties of vertically aligned ZnO nanowires (NWs) before and after high energy argon ion (Ar+) milling. It is found that the outer regions of the as-grown sample change from crystalline to amorphous, and ZnO core-shell NWs with ZnO nanocrystals embedded are formed after Ar+ milling. Optical properties of the ZnO NWs have been investigated systematically through power and temperature dependent photoluminescence measurements, and the phenomenon of exciton localization as well as the relevant favorable photoluminescence characteristics is elucidated. Interestingly, under high density optical pumping at room temperature, coherent random lasing action is observed, which is ascribed to exciton localization and strong scattering. Our results on the unique optical properties of localized exciton in ZnO core-shell nanostructures shed light on developing stable and high-efficiency excitonic optoelectronic devices such as light-emitting diodes and lasers.

KW - ZnO

KW - exciton

KW - localization

KW - photoluminescence

KW - random lasing

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U2 - 10.1021/nl304433m

DO - 10.1021/nl304433m

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SN - 1530-6984

VL - 13

SP - 734

EP - 739

JO - Nano Letters

JF - Nano Letters

IS - 2

ER -

Exciton localization and optical properties improvement in nanocrystal-embedded ZnO core-shell nanowires

Abstract

Keywords

ASJC Scopus subject areas

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