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Polymer White-Light-Emitting Diodes with High Work Function Cathode Based on a Novel Phosphorescent Chelating Copolymer |
| XIONG Yan;ZHANG Yong;ZHOU Jian-Lin;PENG Jun-Biao;HUANG Wen-Bo;CAO Yong |
| Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Special Functional Materials of Ministry of Education, South China University of Technology, Guangzhou 510640 |
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| Cite this article: |
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XIONG Yan, ZHANG Yong, ZHOU Jian-Lin et al 2007 Chin. Phys. Lett. 24 3547-3550 |
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Abstract Polymer white-light-emitting diodes are fabricated based on the blend of poly[9,9-di-(2-% ethylhexyl)-fluorenyl-2,7-diyl]-end capped with polysilsesquioxane (PFO) and a chelating copolymer of poly[(9,9-bis(3'-(N,N-dimethylamino) propyl)-2,7-fluorene-alt-2,7-(9,9-dioctylfluorene))-co- [2,7-(9,9-dioctlyfluorene)-alt-5,5-bis(2-(4-methyl-1-naphtha-lene) pyridine-C2,N)
iridium (III) acethylacetonate]] (PFN-NaIr). The device with the sole aluminium cathode is able to produce a comparably white electroluminescence efficiency of 1.31cd/A to that of the device using low work function cathodes (such as Ba, Ca, etc.). The CIE coordinates of the white light emission consisting of red, green and blue three components are nearly at (0.34, 0.35). The mechanism of the white light emission from the device with the Al cathode is investigated, which is related to the efficient injection of electrons through the interface of PFN-NaIr/Al.
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| Keywords:
78.60.Fi
78.66.Qn
85.60.Jb
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Received: 09 July 2007
Published: 03 December 2007
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