Abstract
A unique, thermally interchangeable, and tunable dual phosphorescence from a single-component organic crystal of DBC (3,6-dibromo-9-ethyl-9H-carbazole) is described here. Temperature-regulated relative intensities of a triple-channel radiative process, viz., singlet and dual triplets, enabled a near-white luminescence in a wide temperature range. Interestingly, the single crystals of DBC can also be plastically bent using external mechanical stress and allow the modulation of phosphorescence. The luminescence was completely singlet-mediated in the monomeric state, while the crystalline solid had three pathways of radiative processes. Strong n−π interactions mediated by non-covalent interactions significantly augment the initially forbidden n−π* transitions, which enabled a strong spin–orbit coupling to obtain large radiative triplet states in the solid state. Trapped higher energy triplets were the significant contributors to the emission at lower temperatures, whereas, at higher temperatures, the lower lying triplets dominated the process. A detailed mechanistic approach to unraveling the findings is summarized in the article.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.