Thermally activated delayed fluorescent (TADF) materials capable of efficient solution-processed non-doped organic light-emitting diodes (OLEDs) are of important and practical significance for further development of OLEDs. In this work, a new electron-donating segment, 2,7-di(9H-carbazol-9-yl)-9,9-dimethyl-9,10-dihydroacridine (2Cz-DMAC), was designed to develop solution-processable non-doped TADF emitters. 2Cz-DMAC can not only simultaneously increase the solubility of compounds and suppress harmful aggregation-caused quenching, but also efficiently broaden the delocalization of the highest occupied molecular orbital and promote the reverse intersystem crossing process. Three new TADF emitters, 2-(2,7-di(9H-carbazol-9-yl)-9,9-dimethylacridin-10(9H)-yl)dibenzo[b,d]thiophene 5,5-dioxide (2Cz-DMAC-BTB), 2-(2,7-di(9H-carbazol-9-yl)-9,9-dimethylacridin-10(9H)-yl)-9H-thioxanthen-9-one (2Cz-DMAC-TXO), 2-(2,7-di(9H-carbazol-9-yl)-9,9-dimethylacridin-10(9H)-yl)thianthrene 5,5,10,10-tetraoxide (2Cz-DMAC-TTR), were developed by using 2Cz-DMAC segment as the electron-donor. As anticipated, the solution-processed non-doped OLEDs employing 2Cz-DMAC-BTB, 2Cz-DMAC-TXO and 2Cz-DMAC-TTR as the emitters respectively exhibited green, orange and red emissions with maximum external quantum efficiencies of 14.0%, 6.6% and 2.9%. These results successfully demonstrate the feasibility and convenience of developing efficient solution-processable non-doped TADF emitters based on 2Cz-DMAC segment.

能够高效溶液处理非掺杂有机发光二极管（OLED）的热激活延迟荧光（TADF）材料对于OLED的进一步发展具有重要和现实意义。在这项工作中，设计了一种新的给电子片段 2,7-di(9 H -carbazol-9-yl)-9,9-dimethyl-9,10-dihydroacridine (2Cz-DMAC)，以开发溶液-可加工的非掺杂 TADF 发射器。2Cz-DMAC不仅可以同时增加化合物的溶解度和抑制有害的聚集引起的猝灭，还可以有效地拓宽最高占据分子轨道的离域，促进逆向系间交叉过程。三种新的 TADF 发射体，2-(2,7-di(9 H -carbazol-9-yl)-9,9-dimethylacridin-10(9 H)-基)二苯并[b,d]噻吩 5,5-二氧化物 (2Cz-DMAC-BTB), 2-(2,7-di(9 H -carbazol-9-yl)-9,9-dimethylacridin-10 (9 H )-yl)-9H-thioxanthen-9-one (2Cz-DMAC-TXO), 2-(2,7-di(9 H -carbazol -9-yl)-9,9-dimethylacridin-10( 9 H )-基)噻蒽 5,5,10,10-四氧化物 (2Cz-DMAC-TTR) 是通过使用 2Cz-DMAC 链段作为电子供体开发的。正如预期的那样，采用 2Cz-DMAC-BTB、2Cz-DMAC-TXO 和 2Cz-DMAC-TTR 作为发射器的溶液处理非掺杂 OLED 分别表现出绿色、橙色和红色发射，最大外量子效率分别为 14.0%、6.6 % 和 2.9%。这些结果成功地证明了开发基于 2Cz-DMAC 段的高效可溶液加工非掺杂 TADF 发射器的可行性和便利性。