Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, China.
Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University , 149 Yanchang Road, Shanghai 200072, China.
ACS Appl Mater Interfaces. 2017 Apr 26;9(16):14112-14119. doi: 10.1021/acsami.6b15358. Epub 2017 Apr 14.
A new bipolar host material 2-(2'-(5-(dibenzo[b,d]furan-4-yl)-1H-indol-1-yl)-1,1'-biphenyl]-4-yl)-1-phenyl-1H-benzo[d]imidazole (INDY) has been designed and synthesized for solution-processed PHOLEDs. A hole-transporting indole conjugated dibenzofuran scaffold and an electron-transporting benzimidazole unit were orthogonally connected with incorporation of a 2,4'-biphenyl bridge, which endows a balanced bipolar charge transfer distribution and appropriate triplet energy level (>2.6 eV). The twisted conformation of INDY also ensures good thermal/morphological stability with high T (148 °C). The solution-processed green PHOLEDs achieved great device efficiencies with 27.33 cd/A and 12.26 lm/W at 7 V. Meanwhile, the red solution-processed PHOLEDs gained excellent performance with the maximum efficiencies of 17.20 cd/A, 9.82 lm/W, and 12.61%. In addition, all of the red devices presented excellent color stability with the same CIE coordinate as (0.65, 0.35) under varying dopant contents and operating voltages.
一种新的双极性主体材料 2-(2'-(5-(二苯并[b,d]呋喃-4-基)-1H-吲哚-1-基)-1,1'-联苯]-4-基)-1-苯基-1H-苯并[d]咪唑(INDY)已被设计并合成用于溶液处理的 PHOLED。吲哚共轭二苯并呋喃支架和电子传输苯并咪唑单元被正交连接，并引入 2,4'-联苯桥，这赋予了平衡的双极电荷转移分布和适当的三重态能级（>2.6 eV）。INDY 的扭曲构象还确保了良好的热/形态稳定性，具有高 T（148°C）。溶液处理的绿色 PHOLED 在 7 V 时实现了出色的器件效率，达到 27.33 cd/A 和 12.26 lm/W。同时，红色溶液处理的 PHOLED 获得了出色的性能，最大效率为 17.20 cd/A、9.82 lm/W 和 12.61%。此外，所有红色器件在不同掺杂含量和工作电压下均呈现出相同的 CIE 坐标（0.65,0.35）的出色颜色稳定性。
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