Control of photoluminescence quantum yield and long-lived triplet emission lifetime in organic alloys. Issue 23 (30th May 2022)

• Record Type: Journal Article
• Authors: Xu, Zhen; Hean, Duane; Yuan, Jennifer; Wolf, Michael O.
• Is Part Of: Chemical science. Volume 13:Issue 23(2022)
• Page Start: 6882
• Page End: 6887
• Publication Date: 2022-05-30
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2sc01922a
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Two structurally similar organic triplet emitters crystallize together to form organic alloys in varying ratios, exhibiting tunable photoluminescence quantum yields and long-lived TADF. Abstract : Two-component crystalline organic alloys with a wide range of compositional ratios (from 30% to 90% of one component) are employed to tune excited-state lifetimes and photoluminescence quantum yields (PLQYs). Alloy crystals exhibit homogeneous distribution of parent compounds by X-ray crystallography and differential scanning calorimetry. The alloys display a 1.5- to 5-fold enhancement in thermally activated delayed fluorescence (TADF) lifetime, compared to the parent compounds. PLQYs can also be tuned by changing alloy composition. The reverse intersystem crossing and long-lived lifetime of the parent compounds give rise to long-lived TADF in the alloys. Organic alloys enable tunability of both lifetime and efficiency, providing a new perspective on the development of organic long-lived emissive materials beyond the rules established for host–guest doped systems.