Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 10, Pages 3613-3623Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b05112
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Funding
- European Research Council
- Royal Society
- Academy of Finland
- ERC [338944-GOCAT]
- Agency of Science, Technology and Research (A*STAR, Singapore)
- EPSRC Cambridge NanoDTC [EP/L015978/1]
- Royal Society [URF\R1\180288, RGF\EA\181008, UF130278, RG140472]
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Light-emitting carbene-metal amide complexes bearing first- and second-generation carbazole dendron ligands are reported, (L-Ad)M(G(n)), (M = Cu and Au; G(n) carbazole dendrimer generation, where n = 1 and 2; L-Ad = adamantyl-substituted cyclic (alkyl)(amino)carbene). The thermal stability of the complexes increases with each dendrimer generation. Cyclic voltammetry indicates that the highest occupied molecular orbital/lowest unoccupied molecular orbital energy levels are largely unaffected by the size of the dendron, while first reduction and oxidation processes show a quasi-reversible character. The gold complexes in toluene at room temperature show photoluminescent quantum yields of up to 51.5% for the first and 78% for the second generation. Varied temperature transient photoluminescence decay is consistent with a thermally activated process, indicating a delayed fluorescence-type emission mechanism. Neat films show excited state lifetimes composed of prompt and dominant sub-microsecond delayed components, with radiative constants of up to 10(6) s(-1). Solution-processed organic light-emitting diodes for first-generation copper and gold dendrimers (L-Ad)M(G(1)) have been fabricated with external quantum efficiencies of 5.5% for copper and 10.3% for gold at practical brightness.
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