Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Recently a synthesis for colloidal perovskite CsPbBr3 nanoplatelets (NPLs) with tunable luminescence was developed [1]. These NPLs show luminescence in the blue range of the electromagnetic spectrum, at wavelengths depending on the thickness of these NPLs. Here we study the geometry and optical properties on timescales up to ten microseconds and show that the dynamics of the excited state is dominated by a slow component which can be fitted well to a recent model where the electron is temporary separated and stored before emission [2,3]. The fraction of delayed photons can be as high as 50% and hence have an important contribution to the overall luminescence.
[1] Akkerman, Q. A. et al. Colloidal Cesium Lead Halide Perovskite Nanoplatelets with Monolayer-Level Thickness Control by a Solution Synthesis Approach. J. Am. Chem. Soc. 138, 1010–1016 (2016).
[2] Rabouw, F. T. et al. Delayed Exciton Emission and Its Relation to Blinking in CdSe Quantum Dots. Nano Lett. 15, 7718–25 (2015).
[3] Rabouw, F. T. et al. Temporary Charge Carrier Separation Dominates the Photoluminescence Decay Dynamics of Colloidal CdSe Nanoplatelets. Nano Lett. 16, 2047–53 (2016).
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