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Title: | Fusion of selenium-embedded multi-resonance units toward narrowband emission and fast triplet-singlet exciton conversion | Authors: | Jin, J Chen, M Jiang, H Zhang, B Xie, Z Wong, WY |
Issue Date: | 3-Sep-2024 | Source: | Advanced optical materials, 3 Sept 2024, v. 12, no. 25, 2400794 | Abstract: | Developing multi-resonance thermally activated fluorescence (MR-TADF) emitters with both fast reverse intersystem crossing (RISC) rate and narrow emission bandwidth still remains a formidable challenge. Herein, a design strategy of fused MR skeleton containing heavy chalcogen (sulfur or selenium) for high-performance MR-TADF molecules is developed. Impressively, Se-embedded emitter (DSeBN) shows extremely narrow full width at half maximum (FWHM) value of 16 nm and ultrafast RISC rate constant up to 2.0 × 106 s−1. The organic light-emitting diode (OLED) based on this emitter exhibits excellent performance parameters with extremely narrow FWHM of 17 nm and high external quantum efficiency (EQE) of 35.31%. Significantly, much suppressed efficiency roll-off is achieved, in which the EQE still stayed at 32.47% and 25.05% at the luminance of 100 and 1000 cd m−2, respectively. These results represent the state-of-the-art device performance in terms of efficiency and FWHM, shedding new light on the development of practical MR-TADF emitters. | Keywords: | Heavy-atom effect Multi-resonance thermally activated delayed fluorescence Narrowband emission Organic light-emitting diodes |
Publisher: | Wiley-VCH Verlag GmbH & Co. KGaA | Journal: | Advanced optical materials | EISSN: | 2195-1071 | DOI: | 10.1002/adom.202400794 | Rights: | © 2024 The Author(s). Advanced Optical Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. The following publication J. Jin, M. Chen, H. Jiang, B. Zhang, Z. Xie, W.-Y. Wong, Fusion of Selenium-Embedded Multi-Resonance Units Toward Narrowband Emission and Fast Triplet-Singlet Exciton Conversion. Adv. Optical Mater. 2024, 12, 2400794 is available at https://doi.org/10.1002/adom.202400794. |
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