实现了高效蓝色电致发光，外量子效率为9.20%，CIE坐标小于0.08，且无准分子发射。

Efficient blue electroluminescence with an external quantum efficiency of 9.20% and CIE < 0.08 without excimer emission.

作者信息

Jayabharathi Jayaraman, Sivaraj Sekar, Thanikachalam Venugopal, Seransenguttuvan Balu

机构信息

Department of Chemistry, Annamalai University Annamalai Nagar Tamilnadu - 608 002 India

出版信息

RSC Adv. 2020 Jul 1;10(42):25059-25072. doi: 10.1039/d0ra03463k. eCollection 2020 Jun 29.

Aromatically substituted phenanthroimidazoles at the C6 and C9 positions enhanced the thermal, photochemical and electroluminescence properties due to extension of conjugation. These new materials exhibit good photophysical properties with high thermal stability, good film-forming property and high luminous efficiency. The electroluminescence performances of C6 and C9 modified phenanthroimidazoles as host emitters were evaluated as well as the dopant in the fabricated devices. Among the non-doped devices, pyrene substituted PPI-Py or PPICN-Py based devices show maximum efficiency: PPI-Py/PPICN-Py: (cd A) - 9.20/9.98; (lm W) - 8.50/9.16; (%) - 5.56/5.80. The doped OLEDs, -MTDATA/TAPC:PPI-Cz (4.81/4.85%), -MTDATA/TAPC:PPICN-Cz (5.23/5.26%), -MTDATA/TAPC:PPI-An (5.01/5.04%), -MTDATA/TAPC:PPICN-An (5.25/5.28%), -MTDATA/TAPC:PPI-Py (5.61/5.65%) and -MTDATA/TAPC:PPICN-Py (5.76/5.78%) show improved device efficiencies compared to non-doped devices. Designing C6/C9 modified phenanthrimidazole fluorophores is an efficient strategy for constructing highly efficient OLEDs.

由于共轭的扩展，在C6和C9位置上的芳族取代菲并咪唑增强了热、光化学和电致发光性能。这些新材料具有良好的光物理性能，具有高热稳定性、良好的成膜性能和高发光效率。评估了C6和C9修饰的菲并咪唑作为主体发光体以及所制备器件中的掺杂剂的电致发光性能。在非掺杂器件中，芘取代的PPI-Py或PPICN-Py基器件显示出最大效率：PPI-Py/PPICN-Py：（cd/A）-9.20/9.98；（lm/W）-8.50/9.16；（%）-5.56/5.80。掺杂的OLED，-MTDATA/TAPC:PPI-Cz（4.81/4.85%），-MTDATA/TAPC:PPICN-Cz（5.23/5.26%），-MTDATA/TAPC:PPI-An（5.01/5.04%），-MTDATA/TAPC:PPICN-An（5.25/5.28%），-MTDATA/TAPC:PPI-Py（5.61/5.65%）和-MTDATA/TAPC:PPICN-Py（5.76/5.78%）与非掺杂器件相比显示出更高的器件效率。设计C6/C9修饰的菲并咪唑荧光团是构建高效OLED的有效策略。