State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, University of Chinese Academy of Sciences , Changchun 130022, People's Republic of China.
College of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Sep 27;9(38):32946-32956. doi: 10.1021/acsami.7b10202. Epub 2017 Sep 13.
By employing triphenylamine (TPA) and/or carbazole as donor and cyano group as acceptor, three donor-π-acceptor (D-π-A)-type fluorophores, 4,6-di(4-(diphenylamino)phenyl)isophthalonitrile (DTPAIPN), 4-(4-(diphenylamino)phenyl)-6-(3,5-(9,9'-dicarbazolyl)phenyl)isophthalonitrile (TPAmCPIPN), and 4,6-di(3,5-(9,9'-dicarbazolyl)phenyl)isophthalonitrile (DmCPIPN), were designed, synthesized, and characterized for their thermal, photophysical, electrochemical, and electroluminescent properties. All three compounds exhibited excellent thermal and morphological stabilities with thermal decomposition (T) and glass transition temperature (T) values ranging from 396 to 516 °C and from 114 to 211 °C, respectively. The investigation into the photophysical properties revealed the aggregation-enhanced emission (AEE) feature of these chromophores. The performances of the nondoped devices were significantly improved as compared to those of the doped devices, further confirming the AEE nature. In particular, DmCPIPN-based nondoped device rendered the maximum current efficiency (CE), power efficiency (PE), and external quantum efficiency (EQE) values of 26.6 cd A, 22.4 lm W, and 8.3%, respectively, in comparison with 9.1 cd A, 4.9 lm W, and 4.2% for the doped device. The versatility of these new luminogens was demonstrated through the utilization of them as host for highly efficient red phosphorescent organic light-emitting diodes (PHOLEDs). The EQE of the DmCPIPN-hosted device reached as high as 19.3% with a reduced efficiency roll-off of 10.3% at 1000 cd m. These results demonstrate that the new luminogens of this work can be used as both nondoped emitter and host for high-performance OLEDs, which facilitates the development of multifunctional materials for OLEDs applications.
采用三苯胺（TPA）和/或咔唑作为供体，氰基作为受体，设计、合成并表征了三种给体-π-受体（D-π-A）型荧光染料：4,6-二（4-（二苯基氨基）苯基）异苯二甲腈（DTPAIPN）、4-（4-（二苯基氨基）苯基）-6-（3,5-（9,9'-二咔唑基）苯基）异苯二甲腈（TPAmCPIPN）和 4,6-二（3,5-（9,9'-二咔唑基）苯基）异苯二甲腈（DmCPIPN），研究了它们的热、光物理、电化学和电致发光性能。所有三种化合物均表现出优异的热稳定性和形态稳定性，热分解（T）和玻璃化转变温度（Tg）值分别在 396 至 516°C 和 114 至 211°C 之间。光物理性质的研究表明，这些发色团具有聚集增强发射（AEE）的特性。与掺杂器件相比，非掺杂器件的性能有了显著提高，进一步证实了 AEE 性质。特别是，与掺杂器件的 9.1 cd A、4.9 lm W 和 4.2%相比，DmCPIPN 基非掺杂器件的最大电流效率（CE）、功率效率（PE）和外量子效率（EQE）值分别为 26.6 cd A、22.4 lm W 和 8.3%。这些新发光体的多功能性通过将它们用作高效红色磷光有机发光二极管（PHOLED）的主体得到了证明。DmCPIPN 主体器件的 EQE 高达 19.3%，在 1000 cd m 时效率滚降仅为 10.3%。这些结果表明，本工作中的新型发光体可用作非掺杂发射器和高性能 OLED 的主体，这有利于开发用于 OLED 应用的多功能材料。
