State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University , Changchun 130024, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Mar 22;9(11):9892-9901. doi: 10.1021/acsami.6b14796. Epub 2017 Mar 8.
Highly efficient long-wavelength thermally activated delayed fluorescence (TADF) materials are developed using 2,3-dicyanopyrazino phenanthrene (DCPP) as the electron acceptor (A), and carbazole (Cz), diphenylamine (DPA), or 9,9-dimethyl-9,10-dihydroacridine (DMAC) as the electron donor (D). Because of the large, rigid π-conjugated structure and strong electron-withdrawing capability of DCPP, TADF molecules with emitting colors ranging from yellow to deep-red are realized with different electron-donating groups and π-conjugation length. The connecting modes between donor and acceptor, that is, with or without the phenyl ring as π-bridge, are also investigated to study the π-bridge effect on the thermal, photophysical, electrochemical, and electroluminescent properties. Yellow, orange, red, and deep-red organic light-emitting diodes (OLEDs) based on DCPP derivatives exhibit high efficiencies of 47.6 cd A (14.8%), 34.5 cd A (16.9%), 12.8 cd A (10.1%), and 13.2 cd A (15.1%), with Commission Internationale de L'Eclairage (CIE) coordinates of (0.44, 0.54), (0.53, 0.46), (0.60, 0.40), and (0.64, 0.36), respectively, which are among the best values for long-wavelength TADF OLEDs.
开发了一种高效的长波长热激活延迟荧光（TADF）材料，以 2,3-二氰基吡嗪并菲（DCPP）作为电子受体（A），咔唑（Cz）、二苯胺（DPA）或 9,9-二甲基-9,10-二氢吖啶（DMAC）作为电子给体（D）。由于 DCPP 具有较大的刚性π共轭结构和较强的吸电子能力，因此可以通过不同的电子给体基团和π共轭长度来实现发射颜色从黄色到深红色的 TADF 分子。此外，还研究了供体和受体之间的连接方式，即有无苯环作为π桥，以研究π桥对热、光物理、电化学和电致发光性能的影响。基于 DCPP 衍生物的黄色、橙色、红色和深红色有机发光二极管（OLED）的效率分别高达 47.6 cd A（14.8%）、34.5 cd A（16.9%）、12.8 cd A（10.1%）和 13.2 cd A（15.1%），色坐标分别为（0.44，0.54）、（0.53，0.46）、（0.60，0.40）和（0.64，0.36），这是长波长 TADF OLED 的最佳值之一。
