Multifunctional properties of D-A luminophores based on acenaphtopyrido[2,3-]pyrazine core: photophysics, photochemistry, and efficient solution-processed OLEDs

A new series of multifunctional compounds displaying thermally activated delayed fluorescence (TADF), room-temperature phosphorescence (RTP), aggregation-induced emission (AIE) or aggregation-induced emission enhancement (AIEE) have been developed, and their optical properties investigated. The mate...

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Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2023-11, Vol.11 (43), p.15246-1526
Main Authors: Silva, Welisson de Pontes, Decarli, Nícolas Oliveira, Espíndola, Leandro, Erfurt, Karol, Blacha-Grzechnik, Agata, Pander, Piotr, Lapkowski, Mieczyslaw, Data, Przemyslaw
Format: Article
Language:English
Subjects:
Emission analysis
Emitters
Optical properties
Organic light emitting diodes
Phosphorescence
Photochemistry
Quantum efficiency
Room temperature
Singlet oxygen
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Summary:A new series of multifunctional compounds displaying thermally activated delayed fluorescence (TADF), room-temperature phosphorescence (RTP), aggregation-induced emission (AIE) or aggregation-induced emission enhancement (AIEE) have been developed, and their optical properties investigated. The materials are based on a twisted donor-acceptor (D-A) motif using acenaphtopyridopyrazine as the acceptor core, and various donors are used for tuning their photophysical behaviour. Time-resolved spectroscopy analysis using different matrices gives a detailed image of their photophysical properties. Solution-processed organic light-emitting diodes (OLEDs) using the new compounds as emitters gave high external quantum efficiency (EQE) of up to 15.3% in the CBP matrix. The triplet excited state of the new emitters poses an opportunity for the photochemical formation of singlet oxygen ( 1 O 2 ) species in solution. We demonstrate that the efficiency of 1 O 2 generation correlates with the Δ E ST and triplet decay lifetime. The maximum 1 O 2 quantum efficiency obtained is ∼48% for NQPy-CBZ . We present multifunctional donor-acceptor luminophores displaying TADF, RTP or AIE suitable for use as sensitisers for singlet oxygen generation as well as OLED emitters.
ISSN:2050-7526
2050-7534
DOI:10.1039/d3tc02860g