Efficient polymer white-light-emitting diodes with a single-emission layer of fluorescent polymer blend |
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| Authors: | Qiaoli Niu Yong Cao |
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| Affiliation: | Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, and Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, Ministry of Education, Guangzhou 510640, China |
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| Abstract: | Efficient polymer white-light-emitting diodes (WPLEDs) have been fabricated with a single layer of fluorescent polymer blend. The device structure consists of ITO/PEDOT/PVK/emissive layer/Ba/Al. The emissive layer is a blend of poly(9,9-dioctylfluorene) (PFO), phenyl-substituted PPV derivative (P-PPV) and a copolymer of 9,9-dioctylfluorene and 4,7-di(4-hexylthien-2-yl)-2,1,3-benzothiadiazole (PFO-DHTBT), which, respectively, emits blue, green and red light. The emission of pure and efficient white light was implemented by tuning the blend weight ratio of PFO: P-PPV: PFO-DHTBT to 96:4:0.4. The maximum current efficiency and luminance are, respectively, 7.6 cd/A at 6.7 V and 11930 cd/m2 at 11.2 V. The CIE coordinates of white-light emission were stable with the drive voltages. |
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| Keywords: | 73.50.&minus h 73.50.Gr 78.55.Kz 78.60.Fi |
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