Li, Huiting; Li, Jiuyan; Liu, Di; Huang, Tingting; Li, Deli published the artcile< Effects of Electron Affinity and Steric Hindrance of the Trifluoromethyl Group on the π-Bridge in Designing Blue Thermally Activated Delayed Fluorescence Emitters>, Application of C19H34O2, the main research area is OLED TADF electron affinity steric hindrance; electron affinity steric hindrance trifluoromethyl pi Bridge; triazine acceptor carbazole tertbutylcarbazole donor; TADF; blue emission; electron affinity; fluorescence; steric hindrance.
To explore the correlation of the acceptor electron affinity and the mol. conformation to the thermally activated delayed fluorescence (TADF) feature, a series of D-π-A mols. were designed and synthesized with triazine (Trz) as the acceptor (A) and carbazole (Cz) or tert-butylcarbazole (BuCz) as the donor (D). On the phenylene bridge between D and A, Me or trifluoromethyl was incorporated close either to D or to A to tune the mol. conformation and the electron-withdrawing ability of acceptor. Both the twist angles and the singlet and triplet energy difference (ΔEST) were observed strongly dependent on the type and position of the substituent on the π-bridge. Only those mols. with trifluoromethyl locating close to the D side, namely TrzCz-CF3 and TrzBuCz-CF3, exhibit TADF feature, verifying that both sufficient electron affinity of the A unit and large dihedral angle between D and the π-bridge are necessary to ensure the occurrence of TADF. The blue organic light-emitting diodes OLED fabricated with TrzCz-CF3 and TrzBuCz-CF3 achieved external quantum efficiencies of 9.40% and 14.22% with CIE coordinates of (0.19, 0.23) and (0.18, 0.29) resp. This study provides practical design strategy for blue TADF materials particularly when planar and less crowded group is used as donor.
Chemistry – A European Journal published new progress about Blue-emitting electroluminescent devices. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Application of C19H34O2.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics