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

Journal Article · Fri Dec 22 00:00:00 EST 2017 · Angewandte Chemie

DOI:https://doi.org/10.1002/ange.201710224· OSTI ID:1410831

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

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.

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Sponsoring Organization:: USDOE

OSTI ID:: 1410831

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 129 Journal Issue: 52; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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