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1 August 2021 Highly efficient dual-dopant enhanced emission OLEDs
Le Yang, Zhihong Yang, Xian Wei Chua, Vincent Kim, Yaxiao Lian, Baodan Zhao, Bruno Ehrler, Dawei Di, Richard Friend
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Proceedings Volume 11808, Organic and Hybrid Light Emitting Materials and Devices XXV; 118080F (2021) https://doi.org/10.1117/12.2595396
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States
Abstract
The efficiency of OLEDs is fundamentally determined by the spin of excited state electrons. We have previously shown, using a new class of emissive molecules, carbene-metal-amides (CMA), an unusual emission pathway based on spin-state inter-conversion - intramolecular rotation induces a shift in the relative energies of the first excited singlet and triplet states, leading to extremely efficient singlet-triplet state interconversion and photoemission. In our recent work, we report solution-processed dual-dopant polymer LEDs, in which highly efficient electroluminescence occurs via an intermolecular energy transfer from CMAs to a fluorescent emitter. With electroluminescence from the simple fluorophore, we obtained record EQEs of >20% in these devices. Photophysical measurements indicate that ultrafast inter-fluorophore energy transfer occurs with near-unity efficiency. They preserve the relative colour purity of simple fluorophores, potential for energy-efficient printable electronics.
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Le Yang, Zhihong Yang, Xian Wei Chua, Vincent Kim, Yaxiao Lian, Baodan Zhao, Bruno Ehrler, Dawei Di, and Richard Friend "Highly efficient dual-dopant enhanced emission OLEDs", Proc. SPIE 11808, Organic and Hybrid Light Emitting Materials and Devices XXV, 118080F (1 August 2021); https://doi.org/10.1117/12.2595396
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KEYWORDS
Organic light emitting diodes
Excitons
Electroluminescence
Energy transfer
Luminescence
Light emitting diodes
Measurement devices
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