Zhou Dongling, Cheng Gang, Tong Glenna So Ming, Che Chi-Ming
State Key Laboratory of Synthetic Chemistry, HKU-CAS Joint, Laboratory on New Materials, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China.
Centre of Machine Learning for Energy Materials and Devices, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China.
Chemistry. 2020 Dec 1;26(67):15718-15726. doi: 10.1002/chem.202003855. Epub 2020 Nov 11.
Highly efficient sky-blue luminescent gold(III) complexes with emission quantum yields up to 82 %, lifetimes down to 0.67 μs and emission peak maxima at 470-484 nm were prepared through a consideration of pincer gold(III) donor-acceptor complexes. Photophysical studies and time-dependent density functional theory (TDDFT) calculations revealed that the emission nature of these gold(III) complexes is most consistent with TADF. Solution-processed OLEDs with these gold(III) complexes as dopants afforded electroluminescence maxima at 465-473 nm with FWHM of 64-67 nm and maximum external quantum efficiencies (EQEs) of up to 15.25 %. This research demonstrates the first example of gold(III)-OLEDs showing electroluminescence maxima at smaller than 470 nm, and highlights the potential of using gold(III)-TADF emitters in the development of high efficiency blue OLEDs and blue emissive dopant in WOLEDs.
通过对钳形金（III）供体-受体配合物的考虑，制备出了高效的天蓝色发光金（III）配合物，其发射量子产率高达82%，寿命低至0.67 μs，发射峰最大值在470 - 484 nm。光物理研究和含时密度泛函理论（TDDFT）计算表明，这些金（III）配合物的发射性质与热激活延迟荧光（TADF）最为一致。以这些金（III）配合物作为掺杂剂的溶液处理有机发光二极管（OLED）在465 - 473 nm处实现了电致发光最大值，半高宽为64 - 67 nm，最大外量子效率（EQE）高达15.25%。这项研究展示了金（III）-OLED在小于470 nm处显示电致发光最大值的首个实例，并突出了在高效蓝色OLED开发中使用金（III）-TADF发射体以及在白光OLED中作为蓝色发射掺杂剂的潜力。
