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Thermally Activated Photoluminescence in Lead Selenide Colloidal Quantum Dots by Ariel Kigel; Maya Brumer; Georgy I. Maikov; Aldona Sashchiuk; Efrat Lifshitz is a Engineering article available to read on EtoBox.

What is Thermally Activated Photoluminescence in Lead Selenide Colloidal Quantum Dots about?

## Abstract The thermal activation processes in PbSe colloidal quantum dots and their influence on the ground‐state exciton emission are discussed. Activation of a dark exciton occurs at 1.4–7 K, assisted by an acoustic phonon coupling. Activation of a bright exciton occurs at 100–200 K, which appears as a sudden change in the photoluminescence band intensity, energy, and full width at half maximum. This activation overcomes the dark–bright‐state splitting, when the activation temperature increases with the decrease of the dots' size. The dark exciton lifetime is found to be ≈6–12 μs at 1.4 K, while the bright exciton lifetime at 300 K evaluated as 450 ns varies slightly with the change in the size of the dots. In addition, the emission quantum yield of these dots, measured at a variety of temperatures when dissolved in various solvents, reveals information about the influence of the environment on the recombination processes.

Who reads Thermally Activated Photoluminescence in Lead Selenide Colloidal Quantum Dots?

Author

Ariel Kigel; Maya Brumer; Georgy I. Maikov; Aldona Sashchiuk; Efrat Lifshitz

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Publons; Wiley (ISSN 1613-6810)

Published

2009

Language

EN

Field

Engineering (Physical Sciences)