Multifunctional thermally activated delayed fluorescence emitter for both doped and non-doped organic light emitting diodes

Yadav, N and Rajamalli, P (2025) Multifunctional thermally activated delayed fluorescence emitter for both doped and non-doped organic light emitting diodes. In: Organic Electronics, 136 .

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Abstract

Developing efficient smart materials that display mechanochromic luminescence (MCL) and thermally activated delayed fluorescence (TADF) remains a formidable challenge. Herein, we designed and synthesized a multifunctional emitter, 2BPy-mTC, where benzoyl pyridyl (2BPy) acts as an acceptor and 3,6-di-tert-butyl-9H-carbazole (TC) acts as a donor. 2BPy-mTC exhibits blue emission with λmax of 456 nm in pristine form and emission shifted to green with λmax of 495 nm upon grinding. Interestingly, when fumed with CH2Cl2, the emission reverts to deep blue at λmax of 440 nm. 2BPy-mTC possesses a �EST of 0.20 eV in neat film and 0.11 eV in doped film (5 wt 2BPy-mTC: mCBP) and exhibits a PLQY of 42 in neat film and 59 in doped film. The transient photoluminescence (PL) decay curves show a delayed lifetime of 110.3 μs for the neat film and 192.9 μs for the doped film and confirm the TADF property in both doped and non-doped film. It shows an EQEmax of 16.3 in doped device with an emission maximum of 484 nm. Conversely, it retains the EQEmax of 13.8 in non-doped device with a slight red shift in the emission maximum (496 nm). This discovery opens a new avenue for designing multifunctional emitters with improved EL performance. © 2024 Elsevier B.V.

Item Type:	Journal Article
Publication:	Organic Electronics
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Publisher.
Keywords:	Blue shift; Chromogenics; Organic light emitting diodes (OLED), Doped films; Emission maxima; Lightemitting diode; Mechanochromism; Multifunctionals; Non-doped; OLED; Organic light-emitting; Thermally activated delayed fluorescence; Thermally activated delayed fluorescences, Fluorescence
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	04 Dec 2024 16:38
Last Modified:	04 Dec 2024 16:38
URI:	http://eprints.iisc.ac.in/id/eprint/86875

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