Issue 3, 2023

Mechanistic insight into CdSe nanoplatelet-sensitized upconversion: size and stacking induced effects

Abstract

CdSe nanoplatelets (NPLs) have been reported as triplet sensitizers for photon upconversion (UC). However, their UC quantum yields lag behind more conventional systems. Here, we take advantage of their one-dimensional quantum confinement to decouple effects caused by the energetic driving force and lateral size. A surprising anti-correlation between the power threshold Ith and the UC quantum yield based on the NPL size is found. We attribute this result to two distinct triplet–triplet annihilation mechanisms based on the NPL lateral dimension and degree of NPL stacking—mediated either by molecular diffusion or triplet energy diffusion.

Graphical abstract: Mechanistic insight into CdSe nanoplatelet-sensitized upconversion: size and stacking induced effects

Supplementary files

Article information

Article type
Communication
Submitted
25 aug 2022
Accepted
06 dec 2022
First published
07 dec 2022

Chem. Commun., 2023,59, 322-325

Mechanistic insight into CdSe nanoplatelet-sensitized upconversion: size and stacking induced effects

Z. A. VanOrman, R. Weiss, A. S. Bieber, B. Chen and L. Nienhaus, Chem. Commun., 2023, 59, 322 DOI: 10.1039/D2CC04694F

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