journal article·2024-08-05

Conformational Isomerization Promotes Balanced Ambipolar Transport for Efficient Narrowband Near-Ultraviolet Fluorophore and Non-doped Device with Low Efficiency Roll-Off

Haoyuan Qi, Shengnan Wang, Zexuan Gao, Danyu Xie, Jie Li, Yuchao Liu, Shanfeng Xue, Shian Ying, Dongge Ma, Shouke Yan

ACS Materials Letters· Volume 6· Issue 8
Publisher page

Abstract

Near-ultraviolet (NUV) organic light-emitting diodes have garnered significant attention, yet the unbalanced ambipolar transport in emitters often leads to poor electroluminescence efficiency and serious roll-off in the non-doped device. Here, a novel NUV fluorophore, namely, 3,6-CNCzC3, exhibiting a hybridized local and charge transfer state, was developed by regulating the substitution pattern. The conformational isomerization endows it with balanced electron/hole mobilities in both low and high electric fields, while the suppression of structural relaxation and low-frequency vibronic coupling in the excited state promotes spectral narrowing. Consequently, the non-doped 3,6-CNCzC3 -based device not only shows a narrow full width at half-maximum of 44 nm and color coordinates of (0.161, 0.028), but also exhibits a maximum external quantum efficiency of 6.69% and maintains a noteworthy value of 5.95% at 1000 cd m –2, which is one of the best values among non-doped NUV-OLEDs at a high luminance level.
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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Lanthanide and Transition Metal Complexes

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

Affiliations

Key Laboratory of Rubber-Plastics, Ministry of Education, Qingdao University of Science & Technology, Qingdao 266042, P. R. China

State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, Center for Aggregation-Induced Emission, AIE Institute, South China University of Technology, Guangzhou 510640, P. R. China

State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China

Funding

Science and Technology Support Plan for Youth Innovation of Colleges and Universities of Shandong Province of China · Natural Science Foundation of Qingdao Municipality · National Natural Science Foundation of China · Natural Science Foundation of Shandong Province

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