Wei Liu, Siwei Zhang, Tao Jiang, Shaoling Li, Zhixin Xie, Yu Zhao, Jianyu Zhang, Carl Redshaw, Xing Feng, Jacky W. Y. Lam, Ben Zhong Tang
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引用次数: 0
摘要
实现优异的窄带发射和提高三重态激子利用率是提高有机发光二极管电致发光效率的关键。本文利用芘环的交错能级，合成了具有聚集诱导发射（AIE）特性的新型1,3-不对称取代芘基蓝色“热激子”材料，用于高性能oled。三苯胺修饰的芘基蓝色发射体在半最大值处表现出窄的全宽度（FWHM） <；而四苯乙烯修饰的化合物在薄膜状态下具有更高的荧光量子产率和更宽的FWHM发射。这些AIE发光源（AIEgens）在非掺杂OLED器件中表现出良好的EL效率和较高的激子利用率（>35.6%）。同时，三苯胺修饰和四苯乙烯修饰的芘进一步用作发射层，在热激活延迟荧光（TADF）敏化蓝色oled中具有良好的发光性能。此外，tpe修饰的芘基TPE-m2Ph的最大亮度、最大电流效率、最大功率效率和最大外量子效率分别为35230 cd m−2、42 cd a−1、48 lm W−1和14.9%。
Pyrene-Based Blue Aggregation-Induced Emission Luminogens: The Synergistic Effect of Through-Space Conjugation for High Exciton Utilization Efficiency and Narrow-Band and Blue OLEDs
Achieving outstanding narrow-band emission and improving the triplet exciton utilization efficiency is crucial for high organic light-emitting diodes (OLEDs) electroluminescence (EL) efficiency. Herein, novel 1,3-asymmetrical substituted pyrene-based blue “hot exciton” materials with aggregation-induced emission (AIE) characteristics are synthesized, utilizing the pyrene ring's staggered energy levels for high-performance OLEDs. The triphenylamine-decorated pyrene-based blue emitters exhibited narrow full width at half maxima (FWHM) < 60 nm, while the tetraphenylethylene-decorated compounds displayed a higher fluorescence quantum yield but broader FWHM emission in the film state. These AIE luminogens (AIEgens) show good EL efficiency and high exciton utilization efficiency (>35.6%) in nondoped OLED devices. Meanwhile, both triphenylamine-decorated and tetraphenylethylene-decorated pyrenes are further utilized as an emitter layer in thermally activated delayed fluorescence (TADF)-sensitized blue OLEDs with great EL performance. Moreover, the TPE-decorated pyrene-based TPE-m2Ph demonstrated a maximum brightness, maximum current efficiency, maximum power efficiency, and maximum external quantum efficiency of 35230 cd m−2, 42 cd A−1, 48 lm W−1, and 14.9%, respectively.
期刊介绍：
Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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