Hydrogen bond-modulated molecular packing and its applications in high-performance non-doped organic electroluminescence
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Original language | English |
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Pages (from-to) | 2734-2740 |
Journal / Publication | Materials Horizons |
Volume | 7 |
Issue number | 10 |
Online published | 13 Aug 2020 |
Publication status | Published - 1 Oct 2020 |
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Abstract
Exploiting high-performance non-doped organic light-emitting diodes (OLEDs) is a step towards future commercial application requirements, but great challenges remain due to quenching related to intermolecular triplet interaction. In this work, a novel strategy of exploiting high-performance non-doped electroluminescence via tuning intermolecular hydrogen bonding is demonstrated. Suitable intermolecular hydrogen bonding enables formation of a 3D supramolecular framework, which not only evidently restricts the nonradiative process and suppresses the triplet exciton quenching caused by π-π stacking of triplets, but also favors the horizontal molecular orientations especially in their non-doped states. The non-doped OLED based on the thermally activated delayed fluorescence emitter mTPy-PXZ with such suitable intermolecular hydrogen bonds exhibits the state-of-the-art performance with maximum external quantum efficiency of up to 23.6% with only 7.2% roll-off at 1000 cd m-2. Moreover, it is the first report that the performance of an OLED with a non-doped emitting layer can surpass its corresponding optimized doped device. It is believed that this hydrogen bond-modulated mechanism can not only provide a new pathway for designing emitters for high-performance non-doped organic electroluminescence, but also has great potential in other solid-state luminescence applications.
Citation Format(s)
Hydrogen bond-modulated molecular packing and its applications in high-performance non-doped organic electroluminescence. / Shi, Yizhong; Wang, Kai; Tsuchiya, Youichi et al.
In: Materials Horizons, Vol. 7, No. 10, 01.10.2020, p. 2734-2740.
In: Materials Horizons, Vol. 7, No. 10, 01.10.2020, p. 2734-2740.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review