Reversible Charge-Carrier Trapping Slows Forster Energy Transfer in CdSe/CdS Quantum-Dot Solids.

ABSTRACT: The dynamics of photoluminescence (PL) from nanocrystal quantum dots (QDs) is significantly affected by the reversible trapping of photoexcited charge carriers. This process occurs after up to 50% of the absorption events, depending on the type of QD considered, and can extend the time between the photoexcitation and relaxation of the QD by orders of magnitude. Although many optoelectronic applications require QDs assembled into a QD solid, until now, reversible trapping has been studied only in (ensembles of) spatially separated QDs. Here, we study the influence of reversible trapping on the excited-state dynamics of CdSe/CdS core/shell QDs when they are assembled into close-packed "supraparticles". Time- and spectrally resolved photoluminescence (PL) measurements reveal competition among

SUBMITTER: Montanarella F 

PROVIDER: S-EPMC6139578 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature