1381986-21-5Relevant articles and documents
Fusing acridine and benzofuran/benzothiophene as a novel hybrid donor for high-performance and low efficiency roll-off TADF OLEDs
Zhang, Qing,Wang, Yaxiong,Yoon, Sung Joon,Chung, Won Jae,Ye, Shaofeng,Guo, Runda,Leng, Panpan,Sun, Shuaiqiang,Lee, Jun Yeob,Wang, Lei
, p. 1864 - 1870 (2020)
Two novel acridine-benzofuran/benzothiophene hybrid donors of 34BxAc (x = F, 34BFAc: 13,13-dimethyl-8,13-dihydrobenzofuro[3,2-a]acridine; x = T, 34BTAc: 13,13-dimethyl-8,13-dihydrobenzo[4,5]thieno[3,2-a]acridine) were developed as aromatic fused donors by combining dimethyl acridine (Ac) with benzofuran and benzothiophene, respectively. As a comparison, the hybrid donors of 12BxAc (x = F, 12BFAc: 5,5-dimethyl-5,13-dihydrobenzofuro[3,2-c]acridine; x = T, 12BTAc: 5,5-dimethyl-5,13-dihydrobenzofuro[3,2-c]acridine) were also prepared. By attaching the TPPM (2,4,6-triphenylpyrimidine) acceptor to these fused hybrid donors (12BFAc, 12BTAc, 34BFAc and 34BTAc), 12BxAc-PM (12FAc-PM and 12BTAc-PM) and 34BxAc-PM (34BFAc-PM and 34BTAc-PM) were further designed and synthesized. It was revealed that 34BxAc-PM was better than 12BxAc-PM at shrinking the singlet-triplet energy gap and decay lifetime, and increasing the photoluminescence quantum yield. The sky-blue thermally activated delayed fluorescent organic light-emitting diodes (OLEDs) with 12BFAc-PM as a dopant just showed a maximum external quantum efficiency (EQE) of 12.9% and a CIEx,y of (0.16, 0.29). The 12BTAc-PM-based device achieved a maximum EQE of 25.6%, however, the efficiency roll-off was relatively serious. In contrast, high-performance and low efficiency roll-off OLEDs can be developed using 34BxAc-PM. For instance, the 34BFAc-PM-based device realized a maximum EQE of 27.7%, and still a high EQE of 24.6% at 1000 cd m-2 and 19.6 cd m-2 at 5000 cd m-2, respectively, indicative of the superiorities of the novel donors (34BFAc and 34BTAc).
Tuning the emissive characteristics of TADF emitters by fusing heterocycles with acridine as donors: Highly efficient orange to red organic light-emitting diodes with EQE over 20percent
Chen, Tianheng,Chen, Zhanxiang,Gao, Jie,Gong, Shaolong,Huang, Chih-Wei,Huang, Zhongyan,Lu, Chen-Han,Wu, Chung-Chih,Xiang, Yepeng,Yang, Chuluo,Zeng, Weixuan,Zeng, Xuan
, p. 9087 - 9094 (2019/07/31)
The development of highly efficient orange-red organic thermally activated delayed fluorescence (TADF) emitters is currently challenging. Herein, we reported two new emitters, namely, BTDMAc-NAI and BFDMAc-NAI with benzofuran and benzothiophene fused to t
Compound taking dibenzo nitrogenous six-membered heterocycle as core and application thereof to organic electroluminescent device
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Paragraph 0076; 0079, (2018/07/30)
The invention discloses a compound taking dibenzo nitrogenous six-membered heterocycle as a core and application thereof to an organic electroluminescent device. The compound has high glass transitiontemperature and molecule thermal stability, suitable HOMO and LUMO energy levels, high Eg, and can effectively enhance the photoelectric property of an OLED device and increase the service life of the OLED device through device structure optimization, and the structure of the compound is as shown in general formula (1).