Silicon‐Based Material with Spiro‐Annulated Fluorene/Triphenylamine as Host and Exciton‐Blocking Layer for Blue Electrophosphorescent Devices |
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| Authors: | Hua Chen Prof?Dr Zuo‐Quan Jiang Chun‐Hong Gao Mei‐Feng Xu Shou‐Cheng Dong Lin‐Song Cui Prof?Dr Shun‐Jun Ji Prof?Dr Liang‐Sheng Liao |
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| Institution: | 1. Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering, and Materials Science, Soochow University, Suzhou 215123 (P. R. China), Fax: (+86)?0512‐65880307;2. Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123 (P. R. China), Fax: (+86) 0512‐65882846 |
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| Abstract: | A novel silicon‐based compound, 10‐phenyl‐2′‐(triphenylsilyl)‐10H‐spiroacridine‐9,9′‐fluorene] (SSTF), with spiro structure has been designed, synthesized, and characterized. Its thermal, electronic absorption, and photoluminescence properties were studied. Its energy levels make it suitable as a host material or exciton‐blocking material in blue phosphorescent organic light‐emitting diodes (PhOLEDs). Accordingly, blue‐emitting devices with iridium(III) bis(4,6‐difluorophenyl)‐pyridinato‐N,C2′]picolinate (FIrpic) as phosphorescent dopant have been fabricated and show high efficiency with low roll‐off. In particular, 44.0 cd A?1 (41.3 lm W?1) at 100 cd m?2 and 41.9 cd A?1 (32.9 lm W?1) at 1000 cd m?2 were achieved when SSTF was used as host material; 28.1 lm W?1 at 100 cd m?2 and 20.6 lm W?1 at 1000 cd m?2 were achieved when SSTF was used as exciton‐blocking layer. All of the results are superior to those of the reference devices and show the potential applicability and versatility of SSTF in blue PhOLEDs. |
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| Keywords: | electrophosphorescence host– guest systems luminescence organic light‐emitting diodes spiro compounds |
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