Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 29, Pages 6770-6776Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c01623
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Funding
- SERB
- UGC
- CSIR
- DST-INSPIRE, Government of India
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CdS quantum dots synthesized by a sol-gel method exhibit significantly Stokes shifted bright photoluminescence, predominantly from the trap states. The photoluminescence decay at the emission maximum is single-exponential, indicating a narrow distribution in the nature of trap states. An additional fast decay component is observed at shorter emission wavelengths, possibly due to band edge emission, which remains elusive in the steady-state spectra. Transient absorption spectra reveal the exciton dynamics in the quantum dots, with stimulated emission observed even at low pump power.
CdS quantum dots (QDs), synthesized by a sol-gel method, exhibit significantly Stokes shifted bright photoluminescence (PL), predominantly from the trap states. Surprisingly, the PL decay at the emission maximum is single-exponential. This is an unusual observation for as-prepared QDs and indicates a narrow distribution in the nature of trap states. A closer look reveals an additional fast component for the decays at shorter emission wavelengths, presumably due to the band edge emission, which remains elusive in the steady-state spectra. Indeed, a significantly narrower and blue-shifted emission band is observed in the decay-associated spectra. The contribution of this component to the steady-state PL intensity is shown to be overwhelmed by that of the significantly stronger trap emission. Exciton dynamics in the quantum dots is elucidated using transient absorption spectra, in which the stimulated emission is observed even at low pump power.
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