Fig. 1 | Scientific Reports

Fig. 1

From: Influence of particle size and dielectric environment on radiative lifetimes of colloidal cadmium selenide single photon emitters

Fig. 1

Energy-level diagram for a three-level system of colloidal CdSe QDs. An electron is excited from the ground state (GS) to an excited state (ES) with the transition rate \(\Gamma _{12}\) upon absorbing a photon of energy equivalent to (ES - GS). This electron either transits to GS with the rate \(\Gamma _{21}\) by emitting a photon or non-radiatively transits to an intermediate state (IS) with the rate \(\Gamma _{23}\). Further relaxation to the GS with rate \(\Gamma _{31}\) occurs radiatively or non-radiatively.

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