期刊
ACS NANO
卷 15, 期 4, 页码 7216-7225出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c00481
关键词
CdSe nanoplatelets; single-particle spectroscopy; transient absorption; trap states; spectral diffusion
类别
资金
- Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation Programme - Ministry of Education, Culture and Science of the government of The Netherlands
- Dutch Research Council NWO (TOP-grant) [715.016.002]
- European Research Council (ERC Advanced Grant First Step) [692691]
- Dutch Research Council NWO [VENI-722.017.002, OCENW.KLEIN.008, VI.Veni.192.034]
Trap states strongly influence semiconductor nanocrystals by affecting their photoluminescence. CdSe nanoplatelets show significant fractions of delayed emission and near-infrared trap emission, revealing the inhomogeneity of trap states even at the single-particle level. Reversible hole trapping results in exponential delayed and trap photoluminescence with lifetimes ranging from 40 to 1300 ns, indicating the complex dynamics of these states.
Trap states can strongly affect semiconductor nanocrystals, by quenching, delaying, and spectrally shifting the photoluminescence (PL). Trap states have proven elusive and difficult to study in detail at the ensemble level, let alone in the single-trap regime. CdSe nanoplatelets (NPLs) exhibit significant fractions of long-lived delayed emission and near-infrared trap emission. We use these two spectroscopic handles to study trap states at the ensemble and the single-particle level. We find that reversible hole trapping leads to both delayed and trap PL, involving the same trap states. At the single-particle level, reversible trapping induces exponential delayed PL and trap PL, with lifetimes ranging from 40 to 1300 ns. In contrast with exciton PL, single-trap PL is broad and shows spectral diffusion and strictly single-photon emission. Our results highlight the large inhomogeneity of trap states, even at the single-particle level.
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