Luminescence enhancement of ZnO-core/a-SiNx: H-shell nanorod arrays

Rui Huang; Shuigang Xu; Yanqing Guo; Wenhao Guo; Xiang Wang; Chao Song; Jie Song; Lin Wang; Kin Ming Ho; Ning Wang

doi:10.1364/OE.21.005891

Luminescence enhancement of ZnO-core/a-SiNx: H-shell nanorod arrays

Rui Huang, Shuigang Xu, Yanqing Guo, Wenhao Guo, Xiang Wang, Chao Song, Jie Song, Lin Wang, Kin Ming Ho, Ning Wang

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

6 Scopus citations

Abstract

We report a remarkable improvement of photoluminescence from ZnO-core/a-SiNx:H-shell nanorod arrays by modulating the bandgap of a-SiNx:H shell. The a-SiNx:H shell with a large bandgap can significantly enhance UV emission by more than 8 times compared with the uncoated ZnO nanorods. Moreover, it is found that the deep-level defect emission can be almost completely suppressed for all the core-shell nanostructures, which is independent of the bandgaps of a-SiNx:H shells. Combining with the analysis of infrared absorption spectrum and luminescence characteristics of NH3-plasma treated ZnO nanorods, the improved photoluminescence is attributed to the decrease of nonradiative recombination probability and the reduction of surface band bending of ZnO cores due to the H and N passivation and the screening effect from the a-SiNx:H shells. Our findings open up new possibilities for fabricating stable and efficient UV-only emitting devices.

Original language	English
Pages (from-to)	5891-5896
Number of pages	6
Journal	Optics Express
Volume	21
Issue number	5
DOIs	https://doi.org/10.1364/OE.21.005891
State	Published - 11 Mar 2013
Externally published	Yes

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title = "Luminescence enhancement of ZnO-core/a-SiNx: H-shell nanorod arrays",

abstract = "We report a remarkable improvement of photoluminescence from ZnO-core/a-SiNx:H-shell nanorod arrays by modulating the bandgap of a-SiNx:H shell. The a-SiNx:H shell with a large bandgap can significantly enhance UV emission by more than 8 times compared with the uncoated ZnO nanorods. Moreover, it is found that the deep-level defect emission can be almost completely suppressed for all the core-shell nanostructures, which is independent of the bandgaps of a-SiNx:H shells. Combining with the analysis of infrared absorption spectrum and luminescence characteristics of NH3-plasma treated ZnO nanorods, the improved photoluminescence is attributed to the decrease of nonradiative recombination probability and the reduction of surface band bending of ZnO cores due to the H and N passivation and the screening effect from the a-SiNx:H shells. Our findings open up new possibilities for fabricating stable and efficient UV-only emitting devices.",

author = "Rui Huang and Shuigang Xu and Yanqing Guo and Wenhao Guo and Xiang Wang and Chao Song and Jie Song and Lin Wang and Ho, {Kin Ming} and Ning Wang",

year = "2013",

month = mar,

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doi = "10.1364/OE.21.005891",

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volume = "21",

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TY - JOUR

T1 - Luminescence enhancement of ZnO-core/a-SiNx

T2 - H-shell nanorod arrays

AU - Huang, Rui

AU - Xu, Shuigang

AU - Guo, Yanqing

AU - Guo, Wenhao

AU - Wang, Xiang

AU - Song, Chao

AU - Song, Jie

AU - Wang, Lin

AU - Ho, Kin Ming

AU - Wang, Ning

PY - 2013/3/11

Y1 - 2013/3/11

N2 - We report a remarkable improvement of photoluminescence from ZnO-core/a-SiNx:H-shell nanorod arrays by modulating the bandgap of a-SiNx:H shell. The a-SiNx:H shell with a large bandgap can significantly enhance UV emission by more than 8 times compared with the uncoated ZnO nanorods. Moreover, it is found that the deep-level defect emission can be almost completely suppressed for all the core-shell nanostructures, which is independent of the bandgaps of a-SiNx:H shells. Combining with the analysis of infrared absorption spectrum and luminescence characteristics of NH3-plasma treated ZnO nanorods, the improved photoluminescence is attributed to the decrease of nonradiative recombination probability and the reduction of surface band bending of ZnO cores due to the H and N passivation and the screening effect from the a-SiNx:H shells. Our findings open up new possibilities for fabricating stable and efficient UV-only emitting devices.

AB - We report a remarkable improvement of photoluminescence from ZnO-core/a-SiNx:H-shell nanorod arrays by modulating the bandgap of a-SiNx:H shell. The a-SiNx:H shell with a large bandgap can significantly enhance UV emission by more than 8 times compared with the uncoated ZnO nanorods. Moreover, it is found that the deep-level defect emission can be almost completely suppressed for all the core-shell nanostructures, which is independent of the bandgaps of a-SiNx:H shells. Combining with the analysis of infrared absorption spectrum and luminescence characteristics of NH3-plasma treated ZnO nanorods, the improved photoluminescence is attributed to the decrease of nonradiative recombination probability and the reduction of surface band bending of ZnO cores due to the H and N passivation and the screening effect from the a-SiNx:H shells. Our findings open up new possibilities for fabricating stable and efficient UV-only emitting devices.

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U2 - 10.1364/OE.21.005891

DO - 10.1364/OE.21.005891

M3 - 文章

AN - SCOPUS:84875145548

SN - 1094-4087

VL - 21

SP - 5891

EP - 5896

JO - Optics Express

JF - Optics Express

IS - 5

ER -

Luminescence enhancement of ZnO-core/a-SiNx: H-shell nanorod arrays

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