Published January 1, 2022
| Version v1
Journal article
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Efficient generation of emissive many-body correlations in copper-doped colloidal quantum wells
Creators
- 1. Nanyang Technol Univ, LUMINOUS Ctr Excellence Semicond Lighting & Displ, Sch Elect & Elect Engn, 50 Nanyang Ave, Singapore 639798, Singapore
- 2. Sun Yat Sen Univ, Sch Elect & Informat Technol, Guangzhou 510275, Peoples R China
- 3. Nanyang Technol Univ, Sch Phys & Math Sci, Singapore 639798, Singapore
Description
Colloidal quantum wells (CQWs) provide an appealing platform to achieve emissive many-body correlations for novel optoelectronic devices, given that they act as hosts for strong carrier Coulomb interactions and present suppressed Auger recombination. However, the demonstrated high-order excitonic emission in CQWs requires ultrafast pumping with high excitation levels and can only be spec-trally resolved at the single-particle level under cryogenic condi-tions. Here, through systematic investigation using static power -dependent emission spectroscopy and transient carrier dynamics, we show that Cu-doped CdSe CQWs exhibit continuous-wave -pumped high-order excitonic emission at room temperature with a large binding energy of X64 meV. We attribute this unique behavior to dopant excitons in which the ultralong lifetime and the highly localized wavefunction facilitate the formation of many-body corre-lations. The spectrally resolved high-order excitonic emission gener-ated at power levels compatible with solar irradiation and electrical injection might pave the way for novel solution-processed solid-state devices.
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