Zn(Te1−xSex) quantum dots synthesized through a facile route and their band-edge and surface state driven visible-light emission

Satoshi Tsukuda; Masao Kita; Takahisa Omata

doi:10.1016/j.jlumin.2020.117829

Zn(Te_1−xSe_x) quantum dots synthesized through a facile route and their band-edge and surface state driven visible-light emission

Satoshi Tsukuda, Masao Kita, Takahisa Omata

IMRAM - Center for Mineral Processing and Metallurgy (CMPM)

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

3 Citations (Scopus)

Abstract

Zn(Te_1−xSe_x) quantum dots (QDs) were synthesized by the hot-injection method using zinc acetate as a zinc source. The composition, x, of the Zn(Te_1−xSe_x) QDs was easily controlled in the range from 0 to 0.28 by changing the molar ratio between Te and Se precursors in the reaction solutions. The Zn(Te_1−xSe_x) QDs with x = 0.24 ± 0.04 having various sizes (diameters from 3.8 to 6.0 nm) exhibited size-dependent photoluminescence (PL) emission with a peak wavelength in the visible region from 530 to 579 nm. The PL emission band involved not only the band-edge emission, but also defect-related emission. The defect responsible for the PL emission was attributed to the Te dangling bond on the surface of the QDs. The electronic transition for the surface state PL emission was concluded to be the transition from the 1S_e quantum level to the acceptor level arising from the Te dangling bond.

Original language	English
Article number	117829
Journal	Journal of Luminescence
Volume	231
DOIs	https://doi.org/10.1016/j.jlumin.2020.117829
Publication status	Published - 2021 Mar

Keywords

Alloy
Cadmium-free
II-VI semiconductor
Phosphor
Quantum dot

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10.1016/j.jlumin.2020.117829

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title = "Zn(Te1−xSex) quantum dots synthesized through a facile route and their band-edge and surface state driven visible-light emission",

abstract = "Zn(Te1−xSex) quantum dots (QDs) were synthesized by the hot-injection method using zinc acetate as a zinc source. The composition, x, of the Zn(Te1−xSex) QDs was easily controlled in the range from 0 to 0.28 by changing the molar ratio between Te and Se precursors in the reaction solutions. The Zn(Te1−xSex) QDs with x = 0.24 ± 0.04 having various sizes (diameters from 3.8 to 6.0 nm) exhibited size-dependent photoluminescence (PL) emission with a peak wavelength in the visible region from 530 to 579 nm. The PL emission band involved not only the band-edge emission, but also defect-related emission. The defect responsible for the PL emission was attributed to the Te dangling bond on the surface of the QDs. The electronic transition for the surface state PL emission was concluded to be the transition from the 1Se quantum level to the acceptor level arising from the Te dangling bond.",

keywords = "Alloy, Cadmium-free, II-VI semiconductor, Phosphor, Quantum dot",

author = "Satoshi Tsukuda and Masao Kita and Takahisa Omata",

note = "Funding Information: This work was supported by {"}Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials{"} from the Ministry of Education, Culture, Sports, Science and Technology of Japan ( MEXT ). Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2021",

month = mar,

doi = "10.1016/j.jlumin.2020.117829",

language = "English",

volume = "231",

journal = "Journal of Luminescence",

issn = "0022-2313",

publisher = "Elsevier",

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T1 - Zn(Te1−xSex) quantum dots synthesized through a facile route and their band-edge and surface state driven visible-light emission

AU - Tsukuda, Satoshi

AU - Kita, Masao

AU - Omata, Takahisa

N1 - Funding Information: This work was supported by "Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials" from the Ministry of Education, Culture, Sports, Science and Technology of Japan ( MEXT ). Publisher Copyright: © 2020 Elsevier B.V.

PY - 2021/3

Y1 - 2021/3

N2 - Zn(Te1−xSex) quantum dots (QDs) were synthesized by the hot-injection method using zinc acetate as a zinc source. The composition, x, of the Zn(Te1−xSex) QDs was easily controlled in the range from 0 to 0.28 by changing the molar ratio between Te and Se precursors in the reaction solutions. The Zn(Te1−xSex) QDs with x = 0.24 ± 0.04 having various sizes (diameters from 3.8 to 6.0 nm) exhibited size-dependent photoluminescence (PL) emission with a peak wavelength in the visible region from 530 to 579 nm. The PL emission band involved not only the band-edge emission, but also defect-related emission. The defect responsible for the PL emission was attributed to the Te dangling bond on the surface of the QDs. The electronic transition for the surface state PL emission was concluded to be the transition from the 1Se quantum level to the acceptor level arising from the Te dangling bond.

AB - Zn(Te1−xSex) quantum dots (QDs) were synthesized by the hot-injection method using zinc acetate as a zinc source. The composition, x, of the Zn(Te1−xSex) QDs was easily controlled in the range from 0 to 0.28 by changing the molar ratio between Te and Se precursors in the reaction solutions. The Zn(Te1−xSex) QDs with x = 0.24 ± 0.04 having various sizes (diameters from 3.8 to 6.0 nm) exhibited size-dependent photoluminescence (PL) emission with a peak wavelength in the visible region from 530 to 579 nm. The PL emission band involved not only the band-edge emission, but also defect-related emission. The defect responsible for the PL emission was attributed to the Te dangling bond on the surface of the QDs. The electronic transition for the surface state PL emission was concluded to be the transition from the 1Se quantum level to the acceptor level arising from the Te dangling bond.

KW - Alloy

KW - Cadmium-free

KW - II-VI semiconductor

KW - Phosphor

KW - Quantum dot

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JO - Journal of Luminescence

JF - Journal of Luminescence

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ER -

Zn(Te_1−xSe_x) quantum dots synthesized through a facile route and their band-edge and surface state driven visible-light emission

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