Role of Semiconductor Nanostructures in Photon Upconversion Applications

Photon upconversion, a process in which multiple low-energy photons are absorbed and re-emitted as higher-energy photons, has recently received a significant amount of attention due to its potential utility across a wide range of optical applications. Traditionally, two types of materials have been used for photon upconversion applications: lanthanide-doped nanocrystals and triplet–triplet annihilation molecules. While these systems have demonstrated good upconversion efficiencies, they both suffer from some limitations, particularly in spectral utilization. In this review, we will highlight the ways semiconductor nanocrystals have been integrated into existing upconverison platforms to address their limitations and improve their usability for some specific upconversion applications. Additionally, we will discuss the recent development of upconversion platforms based entirely on semiconductor nanostructures. These systems rely on the size-, shape-, and composition-dependent optical properties of semiconductors to design upconverting materials with the necessary electronic structure for a specific application. We discuss the current status of these hybrid and pure semiconductor-based upconverters and suggest future directions for further improving their upconversion performance.
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Optical Materials, copyright © 2023 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see This article will be embargoed until 04/28/2024.
upconversion, semiconductor, quantum dots, nanoparticles, lanthanide, triplet−triplet annihilation, TTA
Cleveland, Jill M., Tory A. Welsch, D. Bruce Chase, and Matthew F. Doty. “Role of Semiconductor Nanostructures in Photon Upconversion Applications.” ACS Applied Optical Materials 1, no. 4 (April 28, 2023): 810–24.