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Novel phenanthroimidazole-based blue AIEgens: reversible mechanochromism, bipolar transporting properties, and electroluminescence
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wang, Zhong-Yi Zhao, Juewen Li, Peng Feng, Tong Wang, Wen-Jian Tao, Silu Tong, Qing-Xiao |
| Copyright Year | 2018 |
| Abstract | Multifunctional materials are crucial and have promising applications in a wide range of organic electronics. Herein, we designed and synthesized two bipolar blue molecules named 2-(4-(4,5-diphenyl-2-(4-(1,2,2-triphenylvinyl)phenyl)-1H-imidazol-1-yl)phenyl)-1-phenyl-1H-phenanthro[9,10-d]imidazole (PPI-PIM-TPE) and 1-phenyl-2-(4-(2-(4-(1,2,2-triphenylvinyl)phenyl)-1H-phenanthro[9,10-d]imidazol-1-yl)phenyl)-1H-phenanthro[9,10-d]imidazole (2PPI-TPE) with aggregation-induced emission (AIE) and mechanochromism characteristics. They both have good thermal stability (Td is 505 °C for PPI-PIM-TPE and 510 °C for 2PPI-TPE), strong AIE properties and reversible mechanochromism. The quantum yields in the solid state were as high as 61.9% for PPI-PIM-TPE and 73.4% for 2PPI-TPE. In addition, the two pristine solid powders are white and emit blue light. After grinding, the solid becomes yellow and emits blue-green emission. The color changes are reversible by solvent fuming. The change in emission color can be observed by the naked eye, demonstrating that they are typical mechanochromic materials. Non-doped blue OLEDs based on 2PPI-TPE exhibit an external quantum efficiency (EQE), current efficiency (CE) and power efficiency (PE) of 2.48%, 6.46 cd A−1 and 4.72 lm W−1, respectively. The doped device based on 2PPI-TPE as a dopant emitter exhibits a higher EQE, CE and PE of 3.55%, 6.67 cd A−1 and 5.52 lm W−1. The performances of the OLEDs with these emitters are among the best of recent reports based on blue materials with AIE and mechanochromism simultaneously. |
| Starting Page | 8924 |
| Ending Page | 8932 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C8NJ01006D |
| Volume Number | 42 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c8/nj/c8nj01006d/c8nj01006d1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C8NJ01006D |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
