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      A π-extended tercarbazole-core multi-resonance delayed fluorescence emitter exhibiting efficient narrowband yellow electroluminescence

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          Abstract

          An efficient yellow-emissive multi-resonance delayed fluorescence material was developed via ring-fusion π-extension design.

          Abstract

          Herein, a simple and versatile molecular design for long-wavelength (>550 nm) multi-resonance thermally activated delayed fluoresence emitters is reported. Extending a fully fused polycyclic π-system with an additional para-N-π-N conjugation induces narrowband bright-yellow photoluminescence and electroluminescence emissions at ∼560 nm.

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          Highly efficient organic light-emitting diodes from delayed fluorescence.

          Hiroki Uoyama, Kenichi Goushi, Katsuyuki Shizu … (2012)
          The inherent flexibility afforded by molecular design has accelerated the development of a wide variety of organic semiconductors over the past two decades. In particular, great advances have been made in the development of materials for organic light-emitting diodes (OLEDs), from early devices based on fluorescent molecules to those using phosphorescent molecules. In OLEDs, electrically injected charge carriers recombine to form singlet and triplet excitons in a 1:3 ratio; the use of phosphorescent metal-organic complexes exploits the normally non-radiative triplet excitons and so enhances the overall electroluminescence efficiency. Here we report a class of metal-free organic electroluminescent molecules in which the energy gap between the singlet and triplet excited states is minimized by design, thereby promoting highly efficient spin up-conversion from non-radiative triplet states to radiative singlet states while maintaining high radiative decay rates, of more than 10(6) decays per second. In other words, these molecules harness both singlet and triplet excitons for light emission through fluorescence decay channels, leading to an intrinsic fluorescence efficiency in excess of 90 per cent and a very high external electroluminescence efficiency, of more than 19 per cent, which is comparable to that achieved in high-efficiency phosphorescence-based OLEDs.
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            Ultrapure Blue Thermally Activated Delayed Fluorescence Molecules: Efficient HOMO-LUMO Separation by the Multiple Resonance Effect.

            Takuji Hatakeyama, Kazushi Shiren, Kiichi Nakajima … (2016)
            Ultrapure blue-fluorescent molecules based on thermally activated delayed fluorescence are developed. Organic light-emitting diode (OLED) devices employing the new emitters exhibit a deep blue emission at 467 nm with a full-width at half-maximum of 28 nm, CIE coordinates of (0.12, 0.13), and an internal quantum efficiency of ≈100%, which represent record-setting performance for blue OLED devices.
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              Narrowband deep-blue organic light-emitting diode featuring an organoboron-based emitter

              Yasuhiro Kondo, Kazuki Yoshiura, Sayuri Kitera … (2019)
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                Author and article information

                Contributors
                Takuma Yasuda: (View ORCID Profile)
                Journal
                Journal ID (publisher-id): CHCOFS
                Title: Chemical Communications
                Abbreviated Title: Chem. Commun.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 1359-7345
                ISSN (Electronic): 1364-548X
                Publication date Created: August 22 2023
                Publication date (Electronic): 2023
                Volume: 59
                Issue: 68
                Pages: 10251-10254
                Affiliations
                [1 ]Institute for Advanced Study, Kyushu University, Fukuoka, Japan
                [2 ]Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603203, Tamil Nadu, India
                Article
                DOI: 10.1039/D3CC03241H
                SO-VID: 261e5de7-86a3-49cb-b529-47ab3a1bcfa6
                Copyright © © 2023
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                http://rsc.li/journals-terms-of-use#chorus

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