Enhanced photoluminescence for ZnS nanocrystals doped with Mn2+ close to carboxyl groups and/or S2- vacancies

T. Isobe; T. Igarashi; M. Konishi; M. Senna

Enhanced photoluminescence for ZnS nanocrystals doped with Mn²⁺ close to carboxyl groups and/or S^2- vacancies

T. Isobe, T. Igarashi, M. Konishi, M. Senna

Department of Applied Chemistry

Research output: Contribution to journal › Conference article › peer-review

18 Citations (Scopus)

Abstract

ZnS nanocrystals doped with Mn²⁺ ions are prepared by a solution process and subsequent UV irradiation to produce the samples with different S/(Zn+Mn) ratios and/or surface modification by acrylic acids. Coordination states around Mn²⁺ ions were examined at 9 and 35 GHz by electron paramagnetic resonance spectroscopy. The Mn²⁺ sites in the vicinity of S^2- vacancies or carboxyl groups are observed at the frequencies more than 9 or 35 GHz, respectively, for nanocrystals, but are not for the bulk sample of 250 nm diameter. Such Mn²⁺ sites enhance the photoluminescence due to d-d transition of Mn²⁺ ions through energy transfer from S^2- vacancies or carboxyl groups, excited simultaneously by a light of 350 nm for exciting ZnS.

Original language	English
Pages (from-to)	383-388
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	536
Publication status	Published - 1999 Jan 1
Event	Proceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' - Boston, MA, USA Duration: 1998 Nov 30 → 1998 Dec 3

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Cite this

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title = "Enhanced photoluminescence for ZnS nanocrystals doped with Mn2+ close to carboxyl groups and/or S2- vacancies",

abstract = "ZnS nanocrystals doped with Mn2+ ions are prepared by a solution process and subsequent UV irradiation to produce the samples with different S/(Zn+Mn) ratios and/or surface modification by acrylic acids. Coordination states around Mn2+ ions were examined at 9 and 35 GHz by electron paramagnetic resonance spectroscopy. The Mn2+ sites in the vicinity of S2- vacancies or carboxyl groups are observed at the frequencies more than 9 or 35 GHz, respectively, for nanocrystals, but are not for the bulk sample of 250 nm diameter. Such Mn2+ sites enhance the photoluminescence due to d-d transition of Mn2+ ions through energy transfer from S2- vacancies or carboxyl groups, excited simultaneously by a light of 350 nm for exciting ZnS.",

author = "T. Isobe and T. Igarashi and M. Konishi and M. Senna",

year = "1999",

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language = "English",

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journal = "Materials Research Society Symposium - Proceedings",

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note = "Proceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' ; Conference date: 30-11-1998 Through 03-12-1998",

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TY - JOUR

T1 - Enhanced photoluminescence for ZnS nanocrystals doped with Mn2+ close to carboxyl groups and/or S2- vacancies

AU - Isobe, T.

AU - Igarashi, T.

AU - Konishi, M.

AU - Senna, M.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - ZnS nanocrystals doped with Mn2+ ions are prepared by a solution process and subsequent UV irradiation to produce the samples with different S/(Zn+Mn) ratios and/or surface modification by acrylic acids. Coordination states around Mn2+ ions were examined at 9 and 35 GHz by electron paramagnetic resonance spectroscopy. The Mn2+ sites in the vicinity of S2- vacancies or carboxyl groups are observed at the frequencies more than 9 or 35 GHz, respectively, for nanocrystals, but are not for the bulk sample of 250 nm diameter. Such Mn2+ sites enhance the photoluminescence due to d-d transition of Mn2+ ions through energy transfer from S2- vacancies or carboxyl groups, excited simultaneously by a light of 350 nm for exciting ZnS.

AB - ZnS nanocrystals doped with Mn2+ ions are prepared by a solution process and subsequent UV irradiation to produce the samples with different S/(Zn+Mn) ratios and/or surface modification by acrylic acids. Coordination states around Mn2+ ions were examined at 9 and 35 GHz by electron paramagnetic resonance spectroscopy. The Mn2+ sites in the vicinity of S2- vacancies or carboxyl groups are observed at the frequencies more than 9 or 35 GHz, respectively, for nanocrystals, but are not for the bulk sample of 250 nm diameter. Such Mn2+ sites enhance the photoluminescence due to d-d transition of Mn2+ ions through energy transfer from S2- vacancies or carboxyl groups, excited simultaneously by a light of 350 nm for exciting ZnS.

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M3 - Conference article

AN - SCOPUS:0032591552

SN - 0272-9172

VL - 536

SP - 383

EP - 388

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

T2 - Proceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998'

Y2 - 30 November 1998 through 3 December 1998

ER -

Enhanced photoluminescence for ZnS nanocrystals doped with Mn²⁺ close to carboxyl groups and/or S^2- vacancies

Abstract

ASJC Scopus subject areas

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