Qian, Gaowei, Yang, Xuefeng, Wang, Xiangbing et al. (6 more authors) (2020) Chiral Platinum-Based Metallomesogens with Highly Efficient Circularly Polarized Electroluminescence in Solution-Processed Organic Light-Emitting Diodes. Advanced Optical Materials. 2000775. ISSN 2195-1071
Abstract
Circularly polarized luminescence (CPL) is of interest due to its wide potential application in semiconductors. To balance the emission efficiency and luminescence dissymmetry factor (gPL) of a CPL emitter, in this context, two chiral, phosphorescent and liquid-crystalline cyclometalated platinum complexes, abbreviated R-Pt and S-Pt, are prepared. The complexes, which show an intense green emission at 504 nm both in solution and in the solid state, contain a simple, ortho-metalated 2-phenylpyridine unit functionalized with a chiral 2-octanol chain, with liquid crystallinity being induced by modifying the β-diketonato ligand with mesogenic groups. Interestingly, both the chiral smectic (SmA*) and nematic (N*) phases are found by a combination of polarized optical microscopy, differential scanning calorimetry, and small-angle X-ray scattering. By annealing, distinct CPL emission is achieved in the solid state with a gPL around 0.02. Employing the chiral platinum complexes as the dopant, solution-processable organic light-emitting diodes present an external quantum efficiency of 11.3% and strong, circularly polarized electroluminescence with an extremely high luminescence dissymmetry value (gEL) of 0.06 after annealing at 100 °C. This work opens an avenue for designing CPL-active emitters with high emission efficiency and high dissymmetry factor.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | chiral liquid crystals,circularly polarized luminescence,organic light-emitting diodes,phosphorescence,platinum complexes |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Chemistry (York) |
Funding Information: | Funder Grant number THE ROYAL SOCIETY IEC\NSFC\181139 |
Depositing User: | Pure (York) |
Date Deposited: | 12 Aug 2020 08:50 |
Last Modified: | 31 Mar 2025 23:08 |
Published Version: | https://doi.org/10.1002/adom.202000775 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1002/adom.202000775 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:164334 |