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Simultaneous Thermally Stimulated Delayed Phosphorescence (TSDP) and Thermally Activated Delayed Fluorescence (TADF) in a Two-Coordinated Au(I) Bimetallic Complex Featuring a Tandem Carbene Structure
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DOI：10.1021/jacs.4c02930.png)
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Abstract
En 中文
A bimetallic, two-coordinated carbene-metal-amine (cMa) Au(I) complex featuring a twisted tandem carbene structure (NHC1-Au-NHC2-Au-carbazolyl) was synthesized. The molecular structure in single crystals revealed a large dihedral angle between the two carbene ligands, while the bridged carbene NHC2 and carbazolyl (Cz) ligands were coplanar. A bluish green thermally stimulated delayed phosphorescence (TSDP) was observed in crystals with an emission lifetime over 70 mu s, which can be attributed to the spin allowed diabatic population of a high-lying emissive triplet state from the (LE)-L-3 characterized low-lying ones. The small rotation energy barrier of Cz along the coordination bond allowed conformers with large dihedral angles between NHC2 and Cz. The ICT characterized S-1 state was consequently stabilized to achieve a thermally accessible energy gap to facilitate ISC between triplets and the S-1, leading to the thermally activated delayed fluorescence (TADF). Simultaneous TSDP and TADF dual emission can be recorded in its doped polymer film owing to the coexistence of these different conformers.
Keywords:
LIGHT-EMITTING-DIODES
CIRCULARLY-POLARIZED ELECTROLUMINESCENCE
EMISSION COLOR TUNABILITY
DESIGN
EFFICIENCY
PROBES
Journal
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15.6
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20.0W
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60.2W