PbS/CdS Core–Shell Quantum Dots Suppress Charge Transfer and Enhance Triplet Transfer

Huang, Zhiyuan; Xu, Zihao; Mahboub, Melika; Li, Xin; Taylor, Jordan W.; Harman, W. Hill; Lian, Tianquan; Tang, Ming Lee

doi:10.1002/ange.201710224

Title: PbS/CdS Core–Shell Quantum Dots Suppress Charge Transfer and Enhance Triplet Transfer

Abstract

Abstract A sub‐monolayer CdS shell on PbS quantum dots (QDs) enhances triplet energy transfer (TET) by suppressing competitive charge transfer from QDs to molecules. The CdS shell increases the linear photon upconversion quantum yield (QY) from 3.5 % for PbS QDs to 5.0 % for PbS/CdS QDs when functionalized with a tetracene acceptor, 5‐CT . While transient absorption spectroscopy reveals that both PbS and PbS/CdS QDs show the formation of the 5‐CT triplet (with rates of 5.91±0.60 ns ⁻¹ and 1.03±0.09 ns ⁻¹ respectively), ultrafast hole transfer occurs only from PbS QDs to 5‐CT . Although the CdS shell decreases the TET rate, it enhances TET efficiency from 60.3±6.1 % to 71.8±6.2 % by suppressing hole transfer. Furthermore, the CdS shell prolongs the lifetime of the 5‐CT triplet and thus enhances TET from 5‐CT to the rubrene emitter, further bolstering the upconverison QY.

Authors:

Huang, Zhiyuan ^[1]; Xu, Zihao ^[2]; Mahboub, Melika ^[1]; Li, Xin ^[1]; Taylor, Jordan W. ^[1]; Harman, W. Hill ^[1];

^[2];

^[1]

Department of Chemistry University of California, Riverside 900 University Ave. Riverside CA 92507 USA
Department of Chemistry Emory University Atlanta GA 30322 USA

Publication Date:: Fri Dec 22 00:00:00 EST 2017

Sponsoring Org.:: USDOE

OSTI Identifier:: 1410831

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Angewandte Chemie

Additional Journal Information:: Journal Name: Angewandte Chemie Journal Volume: 129 Journal Issue: 52; Journal ID: ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)

Country of Publication:: Germany

Language:: English

Citation Formats


                    Huang, Zhiyuan, Xu, Zihao, Mahboub, Melika, Li, Xin, Taylor, Jordan W., Harman, W. Hill, Lian, Tianquan, and Tang, Ming Lee. PbS/CdS Core–Shell Quantum Dots Suppress Charge Transfer and Enhance Triplet Transfer.  Germany: N. p., 2017. 
Web.  doi:10.1002/ange.201710224.

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                    Huang, Zhiyuan, Xu, Zihao, Mahboub, Melika, Li, Xin, Taylor, Jordan W., Harman, W. Hill, Lian, Tianquan, & Tang, Ming Lee. PbS/CdS Core–Shell Quantum Dots Suppress Charge Transfer and Enhance Triplet Transfer.  Germany.  https://doi.org/10.1002/ange.201710224

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                    Huang, Zhiyuan, Xu, Zihao, Mahboub, Melika, Li, Xin, Taylor, Jordan W., Harman, W. Hill, Lian, Tianquan, and Tang, Ming Lee. Fri .  
"PbS/CdS Core–Shell Quantum Dots Suppress Charge Transfer and Enhance Triplet Transfer".  Germany.  https://doi.org/10.1002/ange.201710224.

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@article{osti_1410831,

  title        = {PbS/CdS Core–Shell Quantum Dots Suppress Charge Transfer and Enhance Triplet Transfer},

  author       = {Huang, Zhiyuan and Xu, Zihao and Mahboub, Melika and Li, Xin and Taylor, Jordan W. and Harman, W. Hill and Lian, Tianquan and Tang, Ming Lee},

  abstractNote = {Abstract A sub‐monolayer CdS shell on PbS quantum dots (QDs) enhances triplet energy transfer (TET) by suppressing competitive charge transfer from QDs to molecules. The CdS shell increases the linear photon upconversion quantum yield (QY) from 3.5 % for PbS QDs to 5.0 % for PbS/CdS QDs when functionalized with a tetracene acceptor, 5‐CT . While transient absorption spectroscopy reveals that both PbS and PbS/CdS QDs show the formation of the 5‐CT triplet (with rates of 5.91±0.60 ns −1 and 1.03±0.09 ns −1 respectively), ultrafast hole transfer occurs only from PbS QDs to 5‐CT . Although the CdS shell decreases the TET rate, it enhances TET efficiency from 60.3±6.1 % to 71.8±6.2 % by suppressing hole transfer. Furthermore, the CdS shell prolongs the lifetime of the 5‐CT triplet and thus enhances TET from 5‐CT to the rubrene emitter, further bolstering the upconverison QY.},

  doi          = {10.1002/ange.201710224},

  journal      = {Angewandte Chemie},

  number       = 52,

  volume       = 129,

  place        = {Germany},

  year         = {Fri Dec 22 00:00:00 EST 2017},

  month        = {Fri Dec 22 00:00:00 EST 2017}

}

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Title: PbS/CdS Core–Shell Quantum Dots Suppress Charge Transfer and Enhance Triplet Transfer

Abstract

Citation Formats

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