Isomeric thermally activated delayed fluorescence emitters based on a quinolino[3,2,1-de]acridine-5,9-dione multiple resonance core and carbazole substituent was written by Liu, Jing-Feng;Zou, Sheng-Nan;Chen, Xing;Yang, Sheng-Yi;Yu, You-Jun;Fung, Man-Keung;Jiang, Zuo-Quan;Liao, Liang-Sheng. And the article was included in Materials Chemistry Frontiers in 2022.Related Products of 100189-84-2 This article mentions the following:
The color purity of the pixels is an essential indicator in organic light-emitting diode (OLED) com. displays. Since the two important parameters of high color purity and efficiency can be achieved simultaneously, multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters have achieved rapid development. Recently, there has been a lot of research work on connecting various donor (D) moieties to the existing MR core, but few studies on how the linking moiety affects the efficiency of MR-TADF emitters. To figure out the influence of substituents on the MR-TADF system, we developed three isomers QAOCz1, QAOCz2, and QAOCz3, which are constructed with the same moieties of 3,11-diphenylquinolino[3,2,1-de]acridine-5,9-dione and 9-phenyl-9H-carbazole (PhCz) by different site connections. Through reasonable adjustments of the substitution site, the donor-acceptor (D-A) interaction of the isomers gradually weakened and mol. rigidity gradually increased. As a result, their singlet-triplet energy gap (铻朎ST) gradually decreased and their photoluminescence quantum yield (PLQY) gradually rose. QAOCz3 with the weakest D-A interaction successfully achieves a much higher PLQY of 98.9% and a smaller 铻朎ST of 0.16 eV. The QAOCz3 based OLED not only realizes the best maximum external quantum efficiency (EQE) of 21.1% but also has the narrowest full-width at half maximum (FWHM) of 40 nm. This work shows that weakening the D-A interaction between the substituents and the MR core by a spacer group is of great significance for the construction of efficient MR-TADF emitters. In the experiment, the researchers used many compounds, for example, 2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2Related Products of 100189-84-2).
2,5-Dibromo-1,3-dimethylbenzene (cas: 100189-84-2) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. The reactivity of organobromine compounds resembles but is intermediate between the reactivity of organochlorine and organoiodine compounds. For many applications, organobromides represent a compromise of reactivity and cost.Related Products of 100189-84-2
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary