| 초록 |
Here, we report the synthesis of two new deep-blue fluorescent emitters, namely AFpTPI and AFmTPI based on AF as a core and TPI derivatives with different linking modes for nondoped solution-processable OLEDs. Their thermal, photophysical, electrochemical, electronic distribution and device characteristics were systematically investigated and are supported by theoretical calculations. Both of them have excellent thermal stability (~450 °C) with high glass transition temperatures (141–152 °C). AFpTPI and AFmTPI show deep-blue emission in solution with high fluorescence quantum yields. In particular, solution-processed nondoped device with AFpTPI as an emitter achieved a maximum EQE of 4.56% with CIE coordinates (0.15, 0.06) and a CE of 2.39 cd A−1, which is exactly matching with EBU blue standard. To the best of our knowledge, this is the first report on nondoped solution-processable OLEDs with efficiency close to 5% and CIE y ≤ 0.06. |
