High external quantum efficiency in yellow and white phosphorescent organic light-emitting diodes using an indoloacridinefluorene type host material |
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| Affiliation: | 1. Department of Nanobiomedical Science & WCU Research Center, Dankook University Graduate School, Chenan-si, Chungnam 330-714, Republic of Korea;2. Department of Polymer Science and Engineering, Dankook University, 126, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Republic of Korea;1. Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila, Via Vetoio 10, 67100 L’Aquila, Italy;2. Dipartimento di Ingegneria Elettronica, Università di Roma “Tor Vergata”, Viale Politecnico I, 00133 Roma, Italy;3. Istituto Superiore delle Comunicazioni e delle Tecnologie dell''Informazione, Ministero dello Sviluppo Economico, Viale America 201, 00144 Roma, Italy;4. CNR-SPIN L’Aquila, Via Vetoio 10, 67100 L’Aquila, Italy;1. Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Provincial Lab for Nanotechnology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China;2. School of Electronic Science and Engineering and Jiangsu Provincial Key Laboratory of Photonic and Electronic Materials, Nanjing University, Nanjing 210093, China |
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| Abstract: | High efficiency yellow phosphorescent organic light-emitting diodes were developed using spirofluorene-9,8′-indolo3,2,1-de]acridine]-2,7-dicarbonitrile (ACDCN) as the host material for yellow emitting iridium(III) bis(4-phenylthieno3,2-c]pyridinato-N,C2′)acetylacetonate (PO-01). The ACDCN host showed bipolar charge transport properties and efficient energy transfer to PO-01 dopant. Maximum external quantum efficiency of 25.7% and external quantum efficiency of 21.9% at 1000 cd/m2 were obtained using ACDCN as the host material. In addition, high external quantum efficiency of 20.9% was achieved in the two color white phosphorescent organic light-emitting diodes with the PO-01 and iridium(III) bis(4,6-difluorophenyl)-pyridinato-N,C2]picolinate doped ACDCN emitting layer. |
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| Keywords: | High efficiency Yellow device Spiroacridinefluorene Host White device |
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