Highly efficient nondoped blue organic light-emitting diodes based on a star-group tetraphenylethylene-substituted aggregation-induced-emission-active organic fluorescent small molecules

Highly efficient nondoped blue organic light-emitting diodes based on a star-group tetraphenylethylene-substituted aggregation-induced-emission-active organic fluorescent small molecules
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基于星型四苯乙烯取代聚集诱导发射活性有机荧光小分子的高效非掺杂蓝色有机发光二极管

DOI:
10.1016/j.dyepig.2019.108082
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发表时间:
2020-04
期刊:
影响因子:
4.5
通讯作者:
Wenjun Yang
Wenjun Yang
中科院分区:
材料科学2区
文献类型:
--
作者:
Lei Xu;Yuan Yu;Jinjin Shi;Wei Cui;Xianhao Lv;Miao Cang;Qikun Sun;Shanfeng Xue;Wenjun Yang

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四苯乙烯(TPE)是一种具有优异聚集诱导发射(AIE)效应的星团。尽管基于TPE取代发射体的有机电致发光(EL)领域已经取得了重大进展,但具有AIE效应的高效、高色纯度TPE取代蓝色荧光团仍然非常罕见。在本文中,使用三苯胺(供体)、菲并咪唑(受体)和四苯乙烯(AIE 发生器)。在四氢呋喃溶液中,分子发光很少,量子效率较低(1.3%);然而,薄膜中的荧光增强(73%),表现出显着的 AIE 特性,从而使 TPETPAPI 能够用于有机发光二极管的未来应用。该非掺杂器件具有 3.0 V 的低开启电压、10780 cd m−2 的最大亮度、12.20 cd A−1 的最大电流效率和 11.95 lm W−1 的最大功率效率,EL 峰值位于 476 nm。 TPETPAPI 表现出迄今为止报道的具有 AIE 特性的 TPE 取代蓝色荧光团中最令人印象深刻的 EL 性能。
Tetraphenylethene (TPE) is a star group exhibiting an excellent aggregation-induced emission (AIE) effect. Although significant progress has been made in the field of organic electroluminescence (EL) based on TPE-substituted emitters, highly efficient and high-color-purity TPE-substituted blue fluorophores with the AIE effect are still very rare. In this paper, a simple and effective molecule—N-phenyl-N-(4-(1-phenyl-1H-phenanthro[9,10-d]imidazol-2-yl)phenyl)-4′-(1,2,2-triphenylvinyl)-[1,1′-biphenyl]-4-amine (TPETPAPI)—was designed and synthesized using triphenylamine (donor), phenanthroimidazole (acceptor), and tetraphenylethylene (AIE generator). In tetrahydrofuran solution, the molecule emits little light and the quantum efficiency is low (1.3%); however, the fluorescence is enhanced in the film (73%), exhibiting remarkable AIE properties, thus enabling TPETPAPI to be used in future applications in organic light-emitting diodes. The nondoped device exhibits a low turn-on voltage of 3.0 V, a maximum luminance of 10780 cd m−2, maximum current efficiency of 12.20 cd A−1, and maximum power efficiency of 11.95 lm W−1, with an EL peak at 476 nm. TPETPAPI exhibits the most impressive EL performance reported to date for a TPE-substituted blue fluorophore with AIE' characteristics.
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