High-performance near-infrared (NIR) polymer light-emitting diodes (PLEDs) based on bipolar Ir(iii )-complex-grafted polymers
| Autor: | Guorui Fu, Wai Yeung Wong, Tiezheng Miao, Weixu Feng, Xingqiang Lü, Jiaxiang Liu, Baowen Wang, Wentao Li |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Journal of Materials Chemistry C. 9:173-180 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/d0tc04377j |
| Popis: | Despite the cost-effective and large-area scalable advantages of NIR-PLEDs based on iridium(III)-complex-doped polymers, the intrinsic phase-separation issue leading to inferior device performance is difficult to address. In this study, taking the vinyl-functionalized [Ir(iqbt)2(vb-ppy)] (Hqibt = 1-(benzo[b]-thiophen-2-yl)-isoquinoline; vb-Hppy = 2-(4′-vinylbiphenyl-4-yl)pyridine) as the polymerized complex monomer, two series of Ir(III)-complex-grafted polymers Poly(NVK-co-[Ir(iqbt)2(vb-ppy)]) and Poly((vinyl-PBD)-co-NVK-co-[Ir(iqbt)2(vb-ppy)]) (NVK = N-vinyl-carbazole; vinyl-PBD = 2-(4-(tert-butyl)phenyl)-5-(4′-vinyl-[1,1′-biphenyl]-4-yl)-2,5-dihydro-1,3,4-oxadiazole) are obtained, respectively. Moreover, by using the bipolar Ir(III)-complex-grafted polymer further doped or grafted with an electron-transport unit as the emitting layer (EML), reliable NIR-PLEDs are realized. In particular based on the concurrent covalent-linkages of both the Ir(III)-complex and the vinyl-PBD towards the carrier-balanced NIR-PLED-III, the achievement of an almost negligible ( |
| Databáze: | OpenAIRE |
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