Multilayer blue polymer light-emitting devices with spin-coated interlayers |
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| Affiliation: | 1. Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, PR China;2. Optoelectronic Materials Research Center, Korea Institute of Science and Technology, Cheongryang, Seoul 130-650, South Korea;3. Corporate R&D Center, Samsung SDI Co., LTD, 428-5, Gongse-Dong, Kiheung-Ku, Yongin-Ci, Gyeonggi-Do 449-902, South Korea |
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| Abstract: | Employment of multilayer heterostructures is a common approach to achieve efficiency and stable organic light emitting diodes (OLEDs). In this work, we report multilayer blue polymer light-emitting devices (PLEDs) by using spin-coated fluorene-triarylamine copolymers as interlayers between the conductive polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT) and the emitting layer. A blue PLED with stepped hole injection profile yields an external quantum efficiency of 6.0% at a luminance of 9500 cd/m2 at 5.5 V and an extrapolated lifetime of more than 18,000 h from 100 cd/m2. |
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