![Author ORCID: We display the ORCID iD icon alongside authors names on our website to acknowledge that the ORCiD has been authenticated when entered by the user. To view the users ORCiD record click the icon. [opens in a new tab]](https://chemrxiv.org/engage/assets/public/chemrxiv/images/logos/orcid.png)
Abstract
Photon upconversion from visible light to ultraviolet (UV) light is useful for various photochemical reactions such as artificial photosynthesis, but its efficiency has been low under practical film conditions. Here, we demonstrate a film with a record-high visible-to-UV upconversion efficiency of 27.6% by simply soaking a porous film with a low-volatile upconversion solution. Furthermore, by combining this film with a microlens array, a significantly low threshold excitation light intensity of less than 0.60 mW cm−2, at least one order of magnitude lower than solar irradiance, is achieved.
Supplementary materials
Title
Electronic Supplementary Information (ESI)
Description
Experimental details, Transmittance of solvents, TTA-UC results of a solution, absorption and fluorescence spectra, SEM images of a porous film, upconverted photoluminescence intensities for one hour, and threshold excitation light intensity.
Actions
