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Novel cyclopenta[def]phenanthrene based blue emitting oligomers for OLEDs |
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| Authors: | Suhee Song Kwanghyun Kim Yoon Bo Shim Hongsuk Suh |
| Institution: | a Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea b LG Electronics Incorporated, Kumi, Kyungbuk, 730-030, Republic of Korea c Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea |
| Abstract: | Novel blue emitters, oligo-MCPPs (tri-MCPP, tetra-MCPP, and penta-MCPP), have been synthesized and characterized. The introduction of cyclopentadef]phenanthrene (CPP) units into the structure of oligo-MCPPs gave LEDs with high efficiency and pure blue emission. UV-visible absorption spectra of the thin films of these compounds appear at 333-354 nm, and their maximum PL emission at 416-447 nm. Multilayer organic EL devices with oligo-MCPPs as an emitting layer showed the turn-on voltage of about 4.8 V, the maximum brightness of 1076 cd/m2 (at 8.2 V), the maximum luminescence efficiency of 0.81 cd/A, and the CIE coordinates of (0.17, 0.14) with blue color. |
| Keywords: | OLEDs CPP Blue emission Oligomers |
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