Tri-Spiral Donor for High Efficiency and Versatile Blue Thermally Activated Delayed Fluorescence Materials
Dr. Wei Li
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorBinbin Li
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorDr. Xinyi Cai
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorLin Gan
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorZhida Xu
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorWenqi Li
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorDr. Kunkun Liu
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorDr. Dongcheng Chen
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorCorresponding Author
Prof. Shi-Jian Su
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorDr. Wei Li
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorBinbin Li
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorDr. Xinyi Cai
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorLin Gan
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorZhida Xu
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorWenqi Li
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorDr. Kunkun Liu
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorDr. Dongcheng Chen
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorCorresponding Author
Prof. Shi-Jian Su
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, 510640 Guangdong Province, P. R. China
Search for more papers by this authorGraphical Abstract
TADF, Tada! By using a tri-spiral donor, the thermally activated delayed fluorescence (TADF) emitter TspiroS-TRZ can achieve a 90 % horizontal orientation dipole ratio and greatly alleviate aggregation-caused emission quenching (ACQ). The emitter demonstrates state-of-the-art external quantum efficiencies (EQEs) of 33.3, 20.0, and 22.8 % in purely organic doped, nondoped sky-blue, and white TADF-OLEDs, respectively. HTAU=hole transporting adjusting unit, OLED=organic light-emitting diode.
Abstract
Blue thermally activated delayed fluorescence (TADF) emitters that can simultaneously achieve high efficiency in doped and nondoped organic light-emitting diodes (OLEDs) are rarely reported. Reported here is a strategy using a tri-spiral donor for such versatile blue TADF emitters. Impressively, by simply extending the nonconjugated fragment and molecular length, aggregation-caused emission quenching (ACQ) can be greatly alleviated to achieve as high as a 90 % horizontal orientation dipole ratio and external quantum efficiencies (EQEs) of up to 33.3 % in doped and 20.0 % in nondoped sky-blue TADF-OLEDs. More fascinatingly, a high-efficiency purely organic white OLED with an outstanding EQE of up to 22.8 % was also achieved by employing TspiroS-TRZ as a blue emitter and an assistant host. This compound is the first blue TADF emitter that can simultaneously achieve high electroluminescence (EL) efficiency in doped, nondoped sky-blue, and white TADF-OLEDs.
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