DataVXAdvanced MaterialsPaper
journal article·2025-03

Bifunctional Group Modulation Strategy Enables MR‐TADF Electroluminescence Toward BT.2020 Green Light Standard

Lin Wu, Ziru Xin, Denghui Liu, Deli Li, Jiasen Zhang, Yubo Zhou, Siyao Wu, Tao Wang, Shi‐Jian Su, Wei Li, Ziyi Ge

Advanced Materials· Volume 37· Issue 9
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Source abstract

Abstract

Abstract Herein, a parallel “bifunctional group” modulation method is proposed to achieve controlled modulation of the emission wavelength and full‐width at half‐maximum (FWHM) values. As a result, three proof‐of‐concept emitters, namely DBNDS‐TPh, DBNDS‐DFPh, and DBNDS‐CNPh, are designed and synthesized, with the first functional dibenzo[ b,d ]thiophene unit concurrently reducing the bandgap and elevate their triplet state energy. A second functional group 1 , 1 ′: 3 ′, 1 ″‐ triphenyl , and electron acceptors 1,3‐difluorobenzene and benzonitrile , respectively, to deepen the HOMO and LUMO levels. Accordingly, the CIE coordinates of DBNDS‐TPh, DBNDS‐DFPh, and DBNDS‐CNPh are (0.13, 0.77), (0.14, 0.77), and (0.14, 0.76) respectively, in a dilute toluene solution. This marks the first instance of achieving a CIE y value of 0.77 in dilute toluene solutions. Significantly, the non‐sensitized pure‐green OLEDs based on DBNDS‐TPh and DBNDS‐DFPh demonstrate peak EQE of 35.0% and 34.5%, with corresponding CIE coordinates of (0.18, 0.75), (0.17, 0.76) at the doping concentration of 1 wt.%, representing the first green OLED with a CIE y value reaching 0.76 in a bottom‐emitting device structure as reported in the literature.
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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Luminescence and Fluorescent Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China

Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 10049 P. R. China

School of Materials Science and Engineering Zhejiang Sci‐Tech University Hangzhou 310018 P. R. China

State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Wushan Road 381, Tianhe District Guangzhou Guangdong 510640 P. R. China

Institute for Smart Materials & Engineering University of Jinan No. 336 Nanxinzhuang West Road Jinan 250022 P. R. China

Ningbo Solartron Technology Co., Ltd Ningbo 315000 P. R. China

Funding

National Natural Science Foundation of China · National Science Fund for Distinguished Young Scholars · Chinese Academy of Sciences

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