Miss Cathay Chai Au-Yeung


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.1 The isomeric effect and extended π-conjugation of the N-heterocycles has 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 the long device operational stabilities 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.


  1. Li, L.-K.; Au-Yeung, C. C.; Tang, M.-C.; Lai, S.-L.; Cheung, W.-L.; Ng, M.; Chan, M.-Y.; Yam, V. W.-W. Materials Horizons, 2022, 9, 281 – 293. 

University: HKU

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