Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 28, Issue 67, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202202439
Keywords
gold alkynyl complex; high emission efficiency; high EQEs; metal TADF; solution-processed OLEDs
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Funding
- Natural Science Foundation of China [22170513, 21971250, 21801170]
- CAS-Croucher Funding Scheme for Joint Laboratories
- Beijing Municipal Science & Technology Commission [Z211100007921020]
- Department of Science and Technology of Guangdong Province [2019QN01C617]
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A series of green to yellow TADF gold(I) complexes with alkynyl ligands have been developed for the first time, showing high photoluminescence quantum yields. By modifying the alkynyl ligands with electron-donating amino groups and using electron-deficient carbene ligands, the excited-state properties have been tuned to achieve TADF emission, leading to high external quantum efficiency in OLEDs.
Two-coordinate donor-metal-acceptor type coinage metal complexes displaying efficient thermally activated delayed fluorescence (TADF) have been unveiled to be highly appealing candidates as emitters for organic light-emitting diodes (OLEDs). Herein a series of green to yellow TADF gold(I) complexes with alkynyl ligands has been developed for the first time. The complexes exhibit high photoluminescence quantum yields (PLQYs) of up to 0.76 in doped films (5 wt % in PMMA) at room temperature. The modifications of alkynyl ligands with electron-donating amino groups together with the use of electron-deficient carbene ligands induce ligand-to-ligand charge transfer excited states that give rise to TADF emission. Spectroscopic and density functional theory (DFT) calculations reveal the roles of electron-donating capability of the alkynyl ligand in tuning the excited-state properties. Solution-processed organic light-emitting diodes (OLEDs) using the present complexes as emitters achieve maximum external quantum efficiency (EQE) of up to 20 %.
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