A {fundamental|basic} {problem|issue|difficulty|dilemma|challenge|trouble} facing thermally activated delayed fluorescence (TADF) {is to|would be to|is always to|is usually to|will be to|should be to} overcome the paradox of {efficient|effective} electronic transitions {and a|along with a|as well as a|plus a|and also a|in addition to a} narrow singlet-triplet {energy|power} gap (ΔEST) {in a|inside a|within a} single luminophore. We present a quinoxaline-based TADF iptycene {as the|because the} {first|initial|very first|1st|initially} clear {example|instance} that homoconjugation {can be|may be|could be|might be|is often|is usually} harnessed as a viable {design|style|design and style} {strategy|technique|method|approach|tactic} toward this objective. Homoconjugation was introduced in an established TADF luminophore by trimerization {through|via|by means of|by way of} an iptycene core. This homoconjugation was confirmed by electrochemistry. As a direct consequence of homoconjugation we observed synergistic improvements to photoluminescence quantum yield (ΦPL), radiative {rate|price} of singlet decay (krS), delayed fluorescence lifetime (τTADF), and {rate|price} of reverse intersystem crossing (krISC), {while|whilst|although|even though|when|though} narrowing the ΔEST. The cooperative enhancement is rationalised with TD-DFT calculations {including|such as|which includes|like} spin-orbit coupling (SOC). A facile synthesis of this {system|method|program|technique}, {and the|and also the|as well as the|along with the|plus the} ubiquity {of the|from the|in the|on the|with the|of your} pyrazine motif in state-of-the-art TADF {materials|supplies|components} across the electromagnetic spectrum, {leads to|results in} {a great|an excellent|a fantastic|a terrific|an incredible|an awesome} {potential|possible|prospective} for generality. 2241720-34-1 structure Buy4-Bromobutoxy-tert-butyl-dimethylsilane PMID:24631563
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