Biowaste-Derived,Self-Organized Arrays of High-Performance 2D Carbon Emitters for Organic Light-Emitting Diodes |
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| Authors: | Amandeep Singh Annalena Wolff Soniya D. Yambem Mostafa Esmaeili James D. Riches Mahboobeh Shahbazi Krishna Feron Ehsan Eftekhari Kostya (Ken) Ostrikov Qin Li Prashant Sonar |
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| Affiliation: | 1. School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD, 4000 Australia;2. Central Analytical Research Facility, Institute for Future Environments, Queensland University of Technology, Brisbane, QLD, 4000 Australia;3. Queensland Micro- and Nanotechnology Centre, School of Engineering and Built Environment, Griffith University, Brisbane, QLD, 4111 Australia;4. Institute for Future Environments, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD, 4000 Australia;5. Centre for Organic Electronics, University of Newcastle, Callaghan, NSW, 2308 Australia |
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| Abstract: | Low-cost flexible organic light-emitting diodes (OLEDs) with nanoemitter material from waste open up new opportunities for sustainable technology. The common emitter materials generated from waste are carbon dots (CDs). However, these have poor luminescent properties. Further solid-state emission quenching makes application in display devices challenging. Here, flexible and rigid OLED devices are demonstrated using self-assembled 2D arrays of CDs derived from waste material, viz., human hair. High-performance CDs with a quantum yield (QY) of 87%, self-assembled into 2D arrays, are achieved by improving the crystallinity and decreasing the CDs' size distribution. The CD island array exhibits ultrahigh hole mobility (≈10−1 cm2 V−1 s−1) and significant reduction in solid-state emission quenching compared to pristine CDs; hence, it is used here as an emitting layer in both indium tin oxide (ITO)-coated glass and ITO-coated flexible poly(ethylene terephthalate) (PET) substrate OLED devices, without any hole-injection layer. The flexible OLED device exhibits a stable, voltage-independent blue/cyan emission with a record maximum luminescence of 350 cd m−2, whereas the OLED device based on the rigid glass substrate shows a maximum luminescence of 700 cd m−2. This work sets up a platform to develop next-generation OLED displays using CD emitters derived from the biowaste material. |
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| Keywords: | biowaste carbon dots charge carrier mobility emitters organic light emitting diodes |
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