4.8 Article

Enhanced Valley Splitting of Exciton Emission in Colloidal PbSe Quantum Dots When the Interdot Distance Coincides with Onset of Forster Resonance Energy Transfer

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JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 12, 页码 3120-3126

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AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c00165

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  1. Cooperative Research Program of the Network Joint Research Center for Materials and Devices [20201098]

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The research found that the valley splitting of PbSe quantum dots can be significantly enhanced by controlling the thickness of the CdSe shell in varying inter-QD distances. When the inter-QD distance is large, Forster resonance energy transfer causes a redshift in photoluminescence emission.
Photoluminescence (PL) emission of colloidal PbSe/CdSe core/shell quantum dots (QDs, CdSe shell thickness: 0.2 nm) at the lowest exciton state was investigated at room temperature and varying inter-QD distance (L = 7-240 nm) by changing the QD concentration. A distinct enhancement of the valley splitting of PbSe QDs was observed upon reducing L. Simultaneously, there was a redshift in the emission due to Forster resonance energy transfer (FRET), when the L value was still sufficiently large (7 nm <= L <= 50 nm) so that the wave functions of different QDs do not overlap. The enhanced valley splitting under no apparent external field is quite interesting as a method to control the valley splitting. The electronic coupling leading to FRET may enhance the valley splitting, because it occurs in an identical range of L.

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