Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 17, Pages 6706-6714Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b01208
Keywords
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Funding
- UGC by The University of Hong Kong (HKU)
- HKU University Research Committee Strategically Oriented Research Theme on Functional Materials for Molecular Electronics Towards Materials and Energy Applications
- University Grants Committee Areas of Excellence (AoE) Scheme from the Hong Kong Special Administrative Region, China [AoE/P-03/08]
- HKU
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A new class of red- to near-infrared (NIR)-emitting cyclometalated alkynylgold(III) complexes was designed and synthesized. Red to NIR emission in the alkynylgold(III) complexes was realized, with the emission band maxima of the complexes in both solution and solid-state thin films found to extend to 823 and 730 nm, respectively. A small energy gap of down to 1.51 eV was achieved in the NIR-emitting complexes, as revealed from the electro-chemical studies. Moreover, a large bathochromic shift of similar to 1370 cm(-1) can be obtained by simply changing the alkynyl ligand. NIR-emitting solution-processable organic light-emitting devices (OLEDs) were also realized, as exemplified by the electro-luminescence properties with band maximum at 720 nm and Commission International de L'Eclairage coordinates of (0.67, 0.33) for devices based on complex 1b. This work not only demonstrates a design strategy to extend the emission of gold(III) complexes into the NIR regime but also represents the first report on gold(III)-based NIR-emitting OLEDs.
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