Tao Jiang, Jiayi Qin, Jieyu Lin, Xiaoxuan Lin, Wei Liu, Zhixin Xie, Carl Redshaw, Zujin Zhao* and Xing Feng*,
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引用次数: 0
摘要
杂化局域和电荷转移(HLCT)激发态发射体由于其有效利用三重态激子的能力而引起了人们的广泛关注。吡喃[4,5-d]咪唑(PyI)被认为是构建HLCT蓝色发射体的重要组成部分。为了了解取代基位置、电子效应和PyI取代基的立体效应对其在激发态下的光学行为和电子跃迁的影响,本文设计并合成了一组l形和v形的PyI基蓝色发射器。l型化合物表现出hlct为主的特点,具有较好的电致发光性能,而v型化合物主要以le为主,其EL光谱在半最大值处(FWHM <60 nm)全宽相对较窄。在OLED器件中,l形pyi型HLCT蓝色发射器的最大亮度(Lmax)为11060 cd m-2,最大外量子效率(ηext)为4.77%,效率滚降显著降低。因此,这项工作提供了详细的例子,证明PyI核上的取代位置如何显著影响HLCT材料的发射行为和OLED性能。此外,这项工作为制备高性能的高通量电子学材料提供了一种有价值的合成策略,可以有效地利用OLED器件中的三重态激子。
Structure-Dependent Pyrene[4,5-d]imidazole-Based Deep Blue-Emitters with High-Performance OLEDs
Hybridized local and charge-transfer (HLCT) excited-state emitters have garnered significant attention due to their ability to efficiently utilize triplet excitons. Pyreno[4,5-d]imidazole (PyI) is considered an outstanding building block for constructing HLCT blue emitters. To understand the influence of the substituent position, the electronic effect, and the steric effect of the PyI substituents on the optical behavior and the electronic transition in the excited state, herein, a set of L-shaped and V-shaped PyI-based blue emitters has been designed and synthesized. The L-shaped compounds exhibit HLCT-dominated characteristics, which demonstrate better electroluminescence properties, while the V-shaped compounds are primarily LE-dominated with a relatively narrower full width at half-maximum (FWHM, <60 nm) in their EL spectra. The L-shaped PyI-based HLCT blue emitters achieve a maximum brightness (Lmax) of 11060 cd m–2 and maximum external quantum efficiency (ηext) of 4.77% in the OLED devices, with significantly reduced efficiency roll-off. Thus, this work provides detailed examples demonstrating how the substitution positions on the PyI core can significantly influence the emission behavior and OLED properties of HLCT materials. Moreover, this work offers a valuable synthetic strategy for the preparation of high-performance HLCT materials that can efficiently harness triplet excitons in OLED devices.
期刊介绍:
ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.