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
Autor: | Vivian Wing-Wah Yam, Cathay Chai Au-Yeung, Man-Chung Tang, Mei-Yee Chan, Lok-Kwan Li, Maggie Ng, Wai-Lung Cheung, Shiu-Lun Lai |
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Rok vydání: | 2022 |
Předmět: |
Photoluminescence
Materials science Ligand Process Chemistry and Technology Orders of magnitude (numbers) Electroluminescence Photochemistry Electrochemistry chemistry.chemical_compound chemistry Mechanics of Materials Pyridine General Materials Science Electrical and Electronic Engineering Thin film Luminescence |
Zdroj: | Materials Horizons. 9:281-293 |
ISSN: | 2051-6355 2051-6347 |
Popis: | 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. |
Databáze: | OpenAIRE |
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