Premium
High Efficiency Sky‐Blue Gold(III)‐TADF Emitters **
Author(s) -
Zhou Dongling,
Cheng Gang,
Tong Glenna So Ming,
Che ChiMing
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202003855
Subject(s) - electroluminescence , dopant , oled , time dependent density functional theory , quantum efficiency , materials science , acceptor , full width at half maximum , density functional theory , optoelectronics , photochemistry , chemistry , doping , nanotechnology , physics , computational chemistry , layer (electronics) , condensed matter physics
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.