Ultraviolet electroluminescence from colloidal ZnO quantum dots in an all-inorganic multilayer light-emitting device

T. Omata; Y. Tani; S. Kobayashi; K. Takahashi; A. Miyanaga; Y. Maeda; S. Otsuka-Yao-Matsuo

doi:10.1063/1.3682307

Ultraviolet electroluminescence from colloidal ZnO quantum dots in an all-inorganic multilayer light-emitting device

T. Omata, Y. Tani, S. Kobayashi, K. Takahashi, A. Miyanaga, Y. Maeda, S. Otsuka-Yao-Matsuo

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

27 Citations (Scopus)

Abstract

We report ultraviolet (UV) electroluminescence (EL) at 3.30 eV of colloidal ZnO quantum dots (QDs) in an inorganic multilayer thin-film EL device. The EL spectrum was identical to the photoluminescence spectrum of the source solution of ZnO QDs, and the emission is attributable to quantum confined electron hole pair recombination. The UV emission was successful when the ZnO QD layer was sandwiched by thin MgO layers, while only a defect-related visible emission appeared without MgO layers. The type-I quantum well structure of MgO/ZnO/MgO and surface passivation of ZnO QDs by MgO must be important for the UV EL emission.

Original language	English
Article number	061104
Journal	Applied Physics Letters
Volume	100
Issue number	6
DOIs	https://doi.org/10.1063/1.3682307
Publication status	Published - 2012 Feb 6
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3682307

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title = "Ultraviolet electroluminescence from colloidal ZnO quantum dots in an all-inorganic multilayer light-emitting device",

abstract = "We report ultraviolet (UV) electroluminescence (EL) at 3.30 eV of colloidal ZnO quantum dots (QDs) in an inorganic multilayer thin-film EL device. The EL spectrum was identical to the photoluminescence spectrum of the source solution of ZnO QDs, and the emission is attributable to quantum confined electron hole pair recombination. The UV emission was successful when the ZnO QD layer was sandwiched by thin MgO layers, while only a defect-related visible emission appeared without MgO layers. The type-I quantum well structure of MgO/ZnO/MgO and surface passivation of ZnO QDs by MgO must be important for the UV EL emission.",

author = "T. Omata and Y. Tani and S. Kobayashi and K. Takahashi and A. Miyanaga and Y. Maeda and S. Otsuka-Yao-Matsuo",

note = "Funding Information: This work was supported in part by a research grant from the Japan Science and Technology Agency and Grants-in-Aid for Scientific Research (B) (No. 23360287) from the Japan Society for the Promotion of Science. ",

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T1 - Ultraviolet electroluminescence from colloidal ZnO quantum dots in an all-inorganic multilayer light-emitting device

AU - Omata, T.

AU - Tani, Y.

AU - Kobayashi, S.

AU - Takahashi, K.

AU - Miyanaga, A.

AU - Maeda, Y.

AU - Otsuka-Yao-Matsuo, S.

N1 - Funding Information: This work was supported in part by a research grant from the Japan Science and Technology Agency and Grants-in-Aid for Scientific Research (B) (No. 23360287) from the Japan Society for the Promotion of Science.

PY - 2012/2/6

Y1 - 2012/2/6

N2 - We report ultraviolet (UV) electroluminescence (EL) at 3.30 eV of colloidal ZnO quantum dots (QDs) in an inorganic multilayer thin-film EL device. The EL spectrum was identical to the photoluminescence spectrum of the source solution of ZnO QDs, and the emission is attributable to quantum confined electron hole pair recombination. The UV emission was successful when the ZnO QD layer was sandwiched by thin MgO layers, while only a defect-related visible emission appeared without MgO layers. The type-I quantum well structure of MgO/ZnO/MgO and surface passivation of ZnO QDs by MgO must be important for the UV EL emission.

AB - We report ultraviolet (UV) electroluminescence (EL) at 3.30 eV of colloidal ZnO quantum dots (QDs) in an inorganic multilayer thin-film EL device. The EL spectrum was identical to the photoluminescence spectrum of the source solution of ZnO QDs, and the emission is attributable to quantum confined electron hole pair recombination. The UV emission was successful when the ZnO QD layer was sandwiched by thin MgO layers, while only a defect-related visible emission appeared without MgO layers. The type-I quantum well structure of MgO/ZnO/MgO and surface passivation of ZnO QDs by MgO must be important for the UV EL emission.

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Ultraviolet electroluminescence from colloidal ZnO quantum dots in an all-inorganic multilayer light-emitting device

Abstract

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