Luminescent Bimetallic Two-Coordinate Gold(I) Complexes Utilizing Janus Carbenes

Ma, Jie; Schaab, Jonas; Paul, Sritoma; Forrest, Stephen R.; Djurovich, Peter I.; Thompson, Mark E.

doi:10.1021/jacs.3c07743

Title: Luminescent Bimetallic Two-Coordinate Gold(I) Complexes Utilizing Janus Carbenes

Journal Article · 28 August 2023 · Journal of the American Chemical Society

DOI: https://doi.org/10.1021/jacs.3c07743 · OSTI ID:2204050

Ma, Jie ^[1]; Schaab, Jonas ^[2]; Paul, Sritoma ^[3];

^[3];

^[2];

^[2]

University of Southern California, Los Angeles, CA (United States); University of Michigan
University of Southern California, Los Angeles, CA (United States)
University of Michigan, Ann Arbor, MI (United States)

A series of bimetallic carbene-metal-amide (cMa) complexes have been prepared with bridging biscarbene ligands to serve as a model for the design of luminescent materials with large oscillator strengths and small energy differences between the singlet and triplet states (ΔE_ST). The complexes have a general structure (R₂N)Au(:carbene—carbene:)Au(NR₂). The bimetallic complexes show solvation-dependent absorption and emission that is analyzed in detail. It is found that the molar absorptivity of the bimetallic complexes is correlated with the energy barrier to rotation of the metal–ligand bond. The bimetallic cMa complexes also exhibit short emission lifetimes (τ = 200–300 ns) with high photoluminescence efficiencies (Φ_PL > 95%). The radiative rates of bimetallic cMa complexes are 3–4 times faster than that of the corresponding monometallic complexes. Analysis of temperature-dependent luminescence data indicates that the lifetime for the singlet state (τS₁) of bimetallic cMa complexes is near 12 ns with a ΔE_ST of 40–50 meV. Here the presented compounds provide a general design for cMa complexes to achieve small values for ΔE_ST while retaining high radiative rates. Solution-processed organic light-emitting devices (OLEDs) made using two of the complexes as luminescent dopants show high efficiency and low roll-off at high luminance.

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Research Organization:: University of Michigan, Ann Arbor, MI (United States); University of Southern California, Los Angeles, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: EE0009688; SC0016450

OSTI ID:: 2204050

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 36 Vol. 145; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

14 SOLAR ENERGY
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Janus carbene
absorption
bimetallic cMa
bimetals
carbene compounds
gold
high radiative rate
ligands
solution OLEDs
solvatochromism

CCDC 2206141: Experimental Crystal Structure Determination Jie, Ma,; Jonas, Schaab,; Peter, Djurovich, https://doi.org/10.5517/ccdc.csd.cc2d1nvz The current record is supplemented by this dataset	dataset	January 2023
CCDC 2206146: Experimental Crystal Structure Determination Jie, Ma,; Jonas, Schaab,; Peter, Djurovich, https://doi.org/10.5517/ccdc.csd.cc2d1p05 The current record is supplemented by this dataset	dataset	January 2023
CCDC 2216906: Experimental Crystal Structure Determination Jie, Ma,; Jonas, Schaab,; Peter, Djurovich, https://doi.org/10.5517/ccdc.csd.cc2ddw3t The current record is supplemented by this dataset	dataset	January 2023
CCDC 2216913: Experimental Crystal Structure Determination Jie, Ma,; Jonas, Schaab,; Peter, Djurovich, https://doi.org/10.5517/ccdc.csd.cc2ddwb1 The current record is supplemented by this dataset	dataset	January 2023
CCDC 2233511: Experimental Crystal Structure Determination Jie, Ma,; Jonas, Schaab,; Peter, Djurovich, https://doi.org/10.5517/ccdc.csd.cc2dz4r9 The current record is supplemented by this dataset	dataset	January 2023

Title: Luminescent Bimetallic Two-Coordinate Gold(I) Complexes Utilizing Janus Carbenes

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