Utilization of Multi-Heterodonors in Thermally Activated Delayed Fluorescence Molecules and Their High Performance Bluish-Green Organic Light-Emitting Diodes.,ACS Applied Materials & Interfaces

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Utilization of Multi-Heterodonors in Thermally Activated Delayed Fluorescence Molecules and Their High Performance Bluish-Green Organic Light-Emitting Diodes.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-02-14 , DOI: 10.1021/acsami.9b20020
Umamahesh Balijapalli ₁ , Masaki Tanaka ₁ , Morgan Auffray ₁ , Chin-Yiu Chan ₁ , Yi-Ting Lee ₁ , Youichi Tsuchiya _{1,

2} , Hajime Nakanotani _{1,

2} , Chihaya Adachi _{1,

2}

Affiliation

We report a series of pentacarbazolyl-benzonitrile derivatives such as 2,4,6-tri(9H-carbazol-9-yl)-3,5-bis(3,6-di(pyridin-3-yl)-9H-carbazol-9-yl)benzonitrile (mPyBN), 3,5-bis(3,6-bis(4-(trifluoromethyl)phenyl)-9H-carbazol-9-yl)-2,4,6-tri(9H-carbazol-9-yl)benzonitrile (pCF3BN), 2,4,6-tri(9H-carbazol-9-yl)-3-(3,6-di(pyridin-3-yl)-9H-carbazol-9-yl)-5-(3,6-diphenyl-9H-carbazol-9-yl)benzonitrile (PyPhBN), 3-(3,6-bis(4-(trifluoromethyl)phenyl)-9H-carbazol-9-yl)-2,4,6-tri(9H-carbazol-9-yl)-5-(3,6-di(pyridin-3-yl)-9H-carbazol-9-yl)benzonitrile (PyCF3BN), and 3-(3,6-bis(4-(trifluoromethyl)phenyl)-9H-carbazol-9-yl)-2,6-di(9H-carbazol-9-yl)-5-(3,6-di(pyridin-3-yl)-9H-carbazol-9-yl)-4-(9H-pyrido[3,4-b]indol-9-yl)benzonitrile (CbPyCF3BN) in which some of the carbazoles are substituted with modified 3,5-diphenyl carbazoles, exhibiting thermally activated delayed fluorescence (TADF) properties. These emitters comprised two, three, and four different types of donors, capable of bluish-green emission of around 480 nm with relatively high photoluminescence quantum yields over 90% in solution. Emitters, namely, PyPhBN, PyCF3BN, and CbPyCF3BN, composed of three and four different types of donors endowed a rather short delayed lifetime (τd) of 4.25, 5.01, and 3.65 μs in their film state, respectively. Bluish-green organic light-emitting diodes based on PyPhBN, PyCF3BN, and CbPyCF3BN exhibit a high external quantum efficiency of 20.6, 19.5, and 19.6%, respectively, with unsurpassed efficiency roll-off behavior. These results indicate that the TADF properties of multidonor type molecules can be manipulated by controlling the types and number of electron donor units.

中文翻译：

在热激活延迟荧光分子及其高性能蓝绿色有机发光二极管中使用多杂配子。

具有热激活延迟荧光（TADF）特性。这些发射器包括两种，三种和四种不同类型的供体，能够以大约480 nm的蓝绿色发射，并且溶液中的相对较高的光致发光量子产率超过90％。由三种和四种不同类型的供体组成的发射体PyPhBN，PyCF3BN和CbPyCF3BN在其薄膜状态下分别具有4.25、5.01和3.65μs的相当短的延迟寿命（τd）。基于PyPhBN，PyCF3BN和CbPyCF3BN的蓝绿色有机发光二极管分别具有20.6、19.5和19.6％的高外部量子效率，并具有无与伦比的效率衰减特性。这些结果表明，可以通过控制电子供体单元的类型和数量来控制多供体型分子的TADF特性。

更新日期：2020-02-17

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