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Polymer-based blue electrophosphorescent light-emitting diodes based on a new iridium(III) diazine complex |
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| Authors: | Guoping Ge Xiaohang Yu Haiqing Guo Fuzhi Wang Dechun Zou |
| Affiliation: | 1. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, 5 Yiheyuan Road, Haidian District, Beijing 100871, China;2. A visiting student from College of Chemistry, Liaoning University, Shengyang 110036, China;3. Key Laboratory of Polymer Chemistry and Physics of Education Ministry, Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, 5 Yiheyuan Road, Haidian District, Beijing 100871, China |
| Abstract: | Polymer-based blue electrophosphorescent light-emitting diodes are reported by doping iridium(III) diazine complex (DFPPM)2Ir(pic) (DFPPM = 2-(2,4-difluorophenyl)-pyrimidine, pic = picolinate) in poly(vinylcarbazole) (PVK) as the source of emission. The iridium(III) diazine complex shows sky blue emission with its maximum emission peak at 476 nm originating from an admixture of triplet metal-to-ligand charge-transfer and ligand-centered states. The (DFPPM)2Ir(pic)-doped device furnishes a maximum external quantum efficiency of 2.2% and power efficiency of 1.9 lm/W at a 10 wt% doping concentration. |
| Keywords: | Metal complexes Blue phosphor Iridium diazine complex 3MLCT Polymer light-emitting diodes |
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