Polarons Explain Luminescence Behavior of Colloidal Quantum Dots at Low Temperature.

ABSTRACT: Luminescence properties of colloidal quantum dots have found applications in imaging, displays, light-emitting diodes and lasers, and single photon sources. Despite wide interest, several experimental observations in low-temperature photoluminescence of these quantum dots, such as the short lifetime on the scale of microseconds and a zero-longitudinal optical phonon line in spectrum, both attributed to a dark exciton in literature, remain unexplained by existing models. Here we propose a theoretical model including the effect of solid-state environment on luminescence. The model captures both coherent and incoherent interactions of band-edge exciton with phonon modes. Our model predicts formation of dressed states by coupling of the exciton with a confined acoustic phonon mode, and explain

SUBMITTER: Khosla M 

PROVIDER: S-EPMC5976793 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature