Pyrene functioned diarylfluorenes as efficient solution processable light emitting molecular glass |
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| Authors: | Feng Liu Chao Tang Qing-Quan Chen Shuang-Zhu Li Hong-Bin Wu Ling-Hai Xie Bo Peng Wei Wei Yong Cao Wei Huang |
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| Affiliation: | 1. State Key Laboratory for Advanced Photonic Materials and Devices, Fudan University, Shanghai 200433, PR China;2. Jiangsu Key Lab of Organic Electronics and Information Displays and Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications (NUPT), Nanjing 210003, China;3. Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | In this paper, we described a new category of solution processable small molecule organic light emitting materials, the pyrene functioned diarylfluorenes: 2PE-PPF and DPE-PPF. They emit blue light in solution and green light in film, and show high thermal stability with the 5% weight loss temperature (Td) over 400 °C. The glass transition temperature (Tg) for 2PE-PPF and DPE-PPF is 102 °C and 147 °C, respectively. These molecules are interesting molecular glass and they have good film forming abilities. Smooth and uniform film could be obtained by spin-coating. This character enables them able to be used in solution processed OLEDs by spin-coating or jet-printing. Single layered device using 2PE-PPF as the active material shows a turn-on voltage of 3.2 V, brightness over 8000 cd/m2 and current efficiency up to 2.55 cd/A. Double layered device by inserting TPBI as the hole-blocking electron-transporting layer increases the maximum efficiency to 5.83 cd/A. |
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