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Polyphenylnaphthalene as a Novel Building Block for High‐Performance Deep‐Blue Organic Light‐Emitting Devices
Advanced Optical Materials ( IF 9 ) Pub Date : 2017-12-19 , DOI: 10.1002/adom.201700855
Wen-Cheng Chen 1 , Yi Yuan 2 , Ze-Lin Zhu 1 , Zuo-Quan Jiang 2 , Liang-Sheng Liao 2 , Chun-Sing Lee 1
Affiliation  

A new member of polycyclic aromatic hydrocarbons named 1,2,3,4‐tetraphenylnaphthalene (TNa) is exploited and used as a potential building block in deep‐blue organic light‐emitting devices (OLEDs) for the first time. By incorporating TNa with phenanthroimidazole, three blue emitters named TNa‐PI, TNa‐BPI, and TNa‐DPI featuring different length of phenyl linkers are designed and synthesized via a facile approach, and systematically characterized with thermal, morphological, theoretical, photophysical, electrical, and electroluminescent (EL) studies. The new fluorophores show intramolecular charge transfer properties in excited state evidenced by positive solvatochromic effect in emission. Theoretical calculation suggests that TNa serves as an electron acceptor in the new molecules. All the new materials can emit intense deep‐blue fluorescence in thin film and show bipolar carrier transport properties, with electron conductivity much better than that of hole. Nondoped OLEDs based on TNa‐DPI exhibit excellent EL performance with a maximum external quantum efficiency (EQE) of 5.78% and deep‐blue emission with color purity of (0.152, 0.085). Furthermore, in the 30 wt.% doped device, TNa‐PI emits efficient violet‐blue EL with Commission Internationale de l'Èclarage coordinates of (0.156, 0.043) and shows a decent EQE of 2.52% at a practical brightness of 1000 cd m−2.

中文翻译:

聚苯萘作为高性能深蓝色有机发光器件的新型构建基块

一种名为1,2,3,4-四苯基萘(TNa)的多环芳烃的新成员被首次开发,并被用作深蓝色有机发光器件(OLED)的潜在组成部分。通过将TNa与菲并咪唑结合在一起,通过一种简便的方法设计和合成了三种具有不同长度的苯基连接基团的蓝色发光体,分别为TNa‐PI,TNa‐BPI和TNa‐DPI,并通过热,形态,理论,光物理,电学进行了系统表征,以及电致发光(EL)研究。新的荧光团在激发态下表现出分子内电荷转移性质,这在发射中具有正的溶剂变色效应。理论计算表明,TNa在新分子中充当电子受体。所有这些新材料都可以在薄膜中发出强烈的深蓝色荧光,并显示出双极载流子传输特性,其电子传导性比空穴传导性好得多。基于TNa-DPI的非掺杂OLED具有出色的EL性能,最大外部量子效率(EQE)为5.78%,并且深蓝色发射的色纯度为(0.152,0.085)。此外,在掺杂30 wt。%的器件中,TNa-PI发出的紫蓝色EL的发光度高,国际声明委员会的坐标为(0.156,0.043),在1000 cd m的实际亮度下显示出不错的EQE为2.52%。78%的深蓝色发射,色纯度为(0.152,0.085)。此外,在掺杂30 wt。%的器件中,TNa-PI发射的紫蓝色EL的发光度高,国际声明委员会的坐标为(0.156,0.043),在1000 cd m的实际亮度下显示出不错的EQE为2.52%。78%的深蓝色发射,色纯度为(0.152,0.085)。此外,在掺杂30 wt。%的器件中,TNa-PI发射的紫蓝色EL的发光度高,国际声明委员会的坐标为(0.156,0.043),在1000 cd m的实际亮度下显示出不错的EQE为2.52%。−2
更新日期:2017-12-19
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