Which Flavor of 9,10-Bis(phenylethynyl)anthracene is Best for Perovskite-Sensitized Triplet-Triplet Annihilation?

10 September 2024, Version 2
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

The lack of viable solid-state annihilators is the greatest hurdle in perovskite-sensitized triplet-triplet annihilation upconversion (UC). Unfavorable singlet and triplet energy surfaces in the solid state have limited successful the implementation of many conventional solution-based annihilators. To date, rubrene is still the best performing annihilator; however, this comes at the cost of a small apparent anti-Stokes shift. To this point, anthracene derivatives are promising candidates to increase the apparent anti-Stokes shift. The well-known green glowstick dye 9,10-(bisphenylethynyl) anthracene (BPEA) and its chlorinated derivatives have already shown great promise in solution-based UC applications. Due to favorable band alignment of the perovskite and triplet energy levels of BPEA, it is conceivable that a wide variety of BPEA derivatives could be compatible with the perovskite-based UC system. Here, we investigate the properties of the parent molecule BPEA and its derivatives 1-chloro-9,10-(bisphenylethynyl)anthracene and 2-chloro-9,10-(bisphenylethynyl) anthracene. Despite similar optical properties in solution, the different molecules exhibit vastly different properties in thin films. UC studies in lead halide perovskite/BPEA bilayer devices demonstrate the importance of intermolecular coupling on the resulting properties of the upconverted emission.

Keywords

upconversion
perovskite
spectroscopy

Supplementary materials

Title
Description
Actions
Title
Supporting Information
Description
Supporting Information
Actions

Comments

Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.