Design and synthesis of yellow- to red-emitting gold(III) complexes containing isomeric thienopyridine and thienoquinoline moieties and their applications in operationally stable organic light-emitting devices,Materials Horizons

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Design and synthesis of yellow- to red-emitting gold(III) complexes containing isomeric thienopyridine and thienoquinoline moieties and their applications in operationally stable organic light-emitting devices
Materials Horizons ( IF 12.2 ) Pub Date : 2021-09-02 , DOI: 10.1039/d1mh00821h
Lok-Kwan Li ₁ , Cathay Chai Au-Yeung ₁ , Man-Chung Tang ₁ , Shiu-Lun Lai ₁ , Wai-Lung Cheung ₁ , Maggie Ng ₁ , Mei-Yee Chan ₁ , Vivian Wing-Wah Yam ₁

Affiliation

A new class of yellow- to red-emitting carbazolylgold(III) complexes containing isomeric thienopyridine or thienoquinoline moieties in the cyclometalating ligand has been designed and synthesized, which showed high photoluminescence quantum yields of over 80% in solid-state thin films. The isomeric effect and extended π-conjugation of the N-heterocycles have been found to remarkably perturb the photophysical, electrochemical and electroluminescence properties of the gold(III) complexes. In particular, the operational lifetimes of organic light-emitting devices based on that incorporated with thieno[2,3-c]pyridine are almost three orders of magnitude longer than that incorporated with thieno[3,2-c]pyridine. This has led to long device operational stability with a LT₇₀ value of up to 63 200 h at a luminance of 100 cd m⁻² and a long half-lifetime of 206 800 h, as well as maximum external quantum efficiencies of up to 8.6% and 14.5% in the solution-processed and vacuum-deposited devices, respectively. This work provides insights into the development of robust and highly luminescent gold(III) complexes and the identification of stable molecular motifs for designing efficient emitters.

中文翻译：

含有异构噻吩并吡啶和噻吩并喹啉部分的黄色至红色发光金 (III) 配合物的设计和合成及其在操作稳定的有机发光器件中的应用

设计并合成了一类新的黄色至红色发光咔唑基金（III）配合物，该配合物在环金属化配体中含有异构的噻吩并吡啶或噻吩并喹啉部分，其在固态薄膜中显示出超过 80% 的高光致发光量子产率。已发现N-杂环的异构效应和扩展的 π 共轭显着扰乱了金 ( III ) 配合物的光物理、电化学和电致发光特性。特别是，基于掺入噻吩并[2,3- c ]吡啶的有机发光器件的使用寿命比掺入噻吩并[3,2- c ]吡啶的有机发光器件的使用寿命长几乎三个数量级。]吡啶。这导致了长期的器件操作稳定性，在 100 cd m ^-2的亮度下，LT ₇₀值高达 63 200 小时，半衰期长达 206 800 小时，最大外部量子效率高达 8.6在溶液处理和真空沉积装置中分别为 % 和 14.5%。这项工作为开发稳健且高度发光的金 ( III ) 配合物以及用于设计高效发射体的稳定分子基序的鉴定提供了见解。

更新日期：2021-09-02

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