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HL: Fachverband Halbleiterphysik

HL 49: Quantum dots and wires II

HL 49.8: Vortrag

Mittwoch, 18. März 2020, 17:15–17:30, POT 151

Exciton recombination dynamics in CdSe nanocrystals in glass matrix — •Gang Qiang¹, Elena V.Shornikova¹, Dmitri R.Yakovlev^1,2, Aleksandr A. Golovatenko², Anna V. Rodina², Evgeniy A. Zhukov¹, Aleksei A. Onushchenko³, and Manfred Bayer^1,2 — ¹Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany. — ²Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia. — ³ITMO University, 199053, St.-Petersburg, Russia.

In this work, we studied CdSe nanocrystal (NC) with diameter from 2.8 to 6.2 nm grown in glass matrix. Temperature and magnetic field dependence of photoluminescence (PL) decay measurements demonstrate the exciton nature of the emission state. With the decreasing of NC size, due to the quantum confinement effect, the band gap of samples is blue shifted, and the bright-dark exciton splitting also becomes larger which is indicated by the deceleration of the dark exciton recombination process where a larger time constant for the long tail of the PL decay curve in the smaller sample is observed.