A novel furo[3,2-c] pyridine-based iridium complex for high-performance organic light- emitting diodes with over 30% external quantum efficiency

作者：Yan, Zhimin; Wang, Yanping; Wang, Jiaxiu; Wang, Yue; Ding, Junqiao^*; Wang, Lixiang^*

来源：Journal of Materials Chemistry C, 2017, 5(39): 10122-10125.

DOI：10.1039/c7tc03937a

• SOLAR-CELLS
• ELECTROPHOSPHORESCENT DEVICES
• CONJUGATED POLYMERS
• ALPHA-OLIGOFURANS
• DENDRIMERS
• OLEDS
• PHOSPHORS
• PROGRESS
• FURAN

A novel furo[3,2-c] pyridine based Ir complex, namely (pfupy) 2Ir(acac), has been developed by replacing sulfurwith oxygen in the C<^> N ligand. Compared with the thiophene-containing (pthpy) 2Ir(acac), the LUMO level is elevated while the HOMO level remains almost unchanged for the resultant furan-containing (pfupy) 2Ir(acac). As a consequence, the emissive maximum is blue-shifted from 556 nm of (pthpy) 2Ir(acac) to 538 nm of (pfupy) 2Ir(acac) together with an improved photoluminescence quantum yield of 0.80. The corresponding device based on (pfupy) 2Ir(acac) realizes a record-high external quantum efficiency (EQE) of 30.5% (110.5 cd A(-1)) without any out-coupling technology. Even at a luminance of 1000 and 5000 cd m(-2), the EQE still remains at 26.6% (96.4 cd A(-1)) and 25.6% (92.7 cd A(-1)), respectively, indicative of the gentle efficiency roll-off. The results clearly demonstrate the great potential of furan-based functional materials applied in OLEDs.

• 出版日期2017-10-21
• 单位长春理工大学; 中国科学院; 超分子结构与材料国家重点实验室; 中国科学院长春应用化学研究所; 吉林大学; 高分子物理与化学国家重点实验室