Deori, U and Nanda, GP and Murawski, C and Rajamalli, P (2024) A perspective on next-generation hyperfluorescent organic light-emitting diodes. In: Chemical Science .
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Abstract
Hyperfluorescence, also known as thermally activated delayed fluorescence (TADF) sensitized fluorescence, is known as a next-generation efficient and innovative process for high-performance organic light-emitting diodes (OLEDs). High external quantum efficiency (EQE) and good color purity are crucial parameters for display applications. Hyperfluorescent OLEDs (HF-OLEDs) take the lead in this respect as they utilize the advantages of both TADF emitters and fluorescent dopants, realizing high EQE with color saturation and long-term stability. Hyperfluorescence is mediated through Förster resonance energy transfer (FRET) from a TADF sensitizer to the final fluorescent emitter. However, competing loss mechanisms such as Dexter energy transfer (DET) of triplet excitons and direct charge trapping on the final emitter need to be mitigated in order to achieve fluorescence emission with high efficiency. Despite tremendous progress, appropriate guidelines and fine optimization are still required to address these loss channels and to improve the device operational lifetime. This perspective aims to provide an overview of the evolution of HF-OLEDs by reviewing both molecular and device design pathways for highly efficient narrowband devices covering all colors of the visible spectrum. Existing challenges and potential solutions, such as molecules with peripheral inert substitution, multi-resonant (MR) TADF emitters as final dopants, and exciplex-sensitized HF-OLEDs, are discussed. Furthermore, the operational device lifetime is reviewed in detail before concluding with suggestions for future device development. © 2024 The Royal Society of Chemistry.
| Item Type: | Journal Article |
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| Publication: | Chemical Science |
| Publisher: | Royal Society of Chemistry |
| Additional Information: | The copyright for this article belongs to the authors. |
| Keywords: | Electric losses; Fiber optic sensors; Forster resonance energy transfer; Quantum efficiency; Semiconductor doping, Color purity; Crucial parameters; Efficient process; External quantum efficiency; Innovative process; Lightemitting diode; Organic light-emitting; Performance; Sensitized fluorescence; Thermally activated delayed fluorescences, Organic light emitting diodes (OLED) |
| Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
| Date Deposited: | 18 Nov 2024 18:09 |
| Last Modified: | 18 Nov 2024 18:09 |
| URI: | http://eprints.iisc.ac.in/id/eprint/86854 |
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