Copper and Gold Cyclic (Alkyl)(amino)carbene Complexes with Sub‐Microsecond Photoemissions: Structure and Substituent Effects on Redox and Luminescent Properties

Romanov, Alexander S.; Becker, Ciaran R.; James, Charlotte E.; Di, Dawei; Credgington, Dan; Linnolahti, Mikko; Bochmann, Manfred

doi:10.1002/chem.201605891

Cited by 111 publications

(152 citation statements)

References 69 publications

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“…The exciton binding energy of copper (I) iodide was reported as 62 meV, which is larger than that of CsPbX 3 (≈18 meV) . This result implies that high PLQY and high exciton binding energy will be attained if a compound consisting of the spatially isolated [CuI] polyhedra is chosen . Kitada and Ishida reported a high PLQY of 73% for polymeric CuI complexes .…”

Section: Comparison Of Plqy Values Of the Blue Luminescence Of Halidementioning

confidence: 97%

Lead‐Free Highly Efficient Blue‐Emitting Cs₃Cu₂I₅ with 0D Electronic Structure

et al. 2018

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Halide perovskites, including CsPbX (X = Cl, Br, I), have gained much attention in the field of optoelectronics. However, the toxicity of Pb and the low photoluminescence quantum yield (PLQY) of these perovskites hamper their use. In this work, new halide materials that meet the requirements of: (i) nontoxicity, (ii) high PLQY, and (iii) ease of fabrication of thin films via the solution process are explored. In particular, copper(I) halide compounds with low-dimensional electronic structures are considered. Cs Cu I has a 0D photoactive site and exhibits blue emission (≈445 nm) with very high PLQYs of ≈90 and ≈60% for single crystals and thin films, respectively. The large exciton binding energy of ≈490 meV explains well the 0D electronic nature of Cs Cu I . Blue electroluminescence of Pb-free halides is demonstrated using solution-derived Cs Cu I thin films.

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Section: Comparison Of Plqy Values Of the Blue Luminescence Of Halidementioning

confidence: 97%

Lead‐Free Highly Efficient Blue‐Emitting Cs₃Cu₂I₅ with 0D Electronic Structure

et al. 2018

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“…We have recently shown that cyclic (alkyl)(amino)carbene (CAAC) complexes of copper and gold show strong photoluminescence, with solid-state quantum yields of up to 96% [15,16]. We report here the syntheses, structures, reactivity and photoluminescence behavior of silver complexes with CAAC ligands with different degrees of steric hindrance, Me2 L, Et2 L, and Ad L (Chart I).…”

Section: Introductionmentioning

confidence: 97%

Synthesis, structures and photoluminescence properties of silver complexes of cyclic (alkyl)(amino)carbenes

Romanov

Bochmann

2017

Journal of Organometallic Chemistry

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Silver complexes of cyclic (alkyl)(amino)carbenes (CAACs), (RL)nAgX (n = 1, X = Cl, Br, I; n = 2, X = OTf; R = Me2, Et2, or adamantyl) are accessible in high yields by reacting free carbenes with silver salts. The smaller carbene ligand Me2L leads to the formation of a mixture of neutral (Me2L)AgCl and cationic [(Me2L)2Ag]+ products. The transmetallation of (AdL)AgCl with copper and gold halides gives the corresponding copper and gold compounds (AdL)MCl (M = Cu and Au) in a clean and quantitative reaction. Whereas (Me2L)AgCl is monomeric in the solid state, (Et2L)AgCl crystallizes as a Cl-bridged dimer. None of the compounds show metal-metal interactions. The complexes show blue photoluminescence, which consists of a fluorescence component with a lifetime of several nanoseconds, as well as a long-lived emission in the microsecond regime

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A recent report introduced a new class of solution-processable TADF-type dopants based on carbene-metal-amide (CMA) materials. [5] Both the exchange energy and the oscillator strength in CMA compounds are calculated to depend on the dihedral angle between the carbene and amide ligands about the CmetalN axis, and on deformation of the CmetalN bond. [5] Both the exchange energy and the oscillator strength in CMA compounds are calculated to depend on the dihedral angle between the carbene and amide ligands about the CmetalN axis, and on deformation of the CmetalN bond.

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confidence: 99%

Efficient Vacuum‐Processed Light‐Emitting Diodes Based on Carbene–Metal–Amides

et al. 2018

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Efficient vacuum-processed organic light-emitting diodes are fabricated using a carbene-metal-amide material, CMA1. An electroluminescence (EL) external quantum efficiency of 23% is achieved in a host-free emissive layer comprising pure CMA1. Furthermore external quantum efficiencies of up to 26.9% are achieved in host-guest emissive layers. EL spectra are found to depend on both the emissive-layer doping concentration and the choice of host material, enabling tuning of emission color from mid-green (Commission Internationale de l'Éclairage co-ordinates [0.24, 0.46]) to sky blue ([0.22 0.35]) without changing dopant. This tuning is achieved without compromising luminescence efficiency (>80%) while maintaining a short radiative lifetime of triplets (<1 μs).

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Copper and Gold Cyclic (Alkyl)(amino)carbene Complexes with Sub‐Microsecond Photoemissions: Structure and Substituent Effects on Redox and Luminescent Properties

Abstract: Table of Contents EntryCopper and gold complexes stabilized by cyclic (alkyl)(amino)carbene ligands ( R L)MX, where X = halide, pseudo-halide, amide or aryloxide represent a large class of photoluminescent materials, with emission lifetimes ranging from nanosecond to microsecond regimes.

Cited by 111 publications

References 69 publications

Lead‐Free Highly Efficient Blue‐Emitting Cs₃Cu₂I₅ with 0D Electronic Structure

Lead‐Free Highly Efficient Blue‐Emitting Cs₃Cu₂I₅ with 0D Electronic Structure

Synthesis, structures and photoluminescence properties of silver complexes of cyclic (alkyl)(amino)carbenes

Efficient Vacuum‐Processed Light‐Emitting Diodes Based on Carbene–Metal–Amides

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Copper and Gold Cyclic (Alkyl)(amino)carbene Complexes with Sub‐Microsecond Photoemissions: Structure and Substituent Effects on Redox and Luminescent Properties

Abstract: Table of Contents EntryCopper and gold complexes stabilized by cyclic (alkyl)(amino)carbene ligands ( R L)MX, where X = halide, pseudo-halide, amide or aryloxide represent a large class of photoluminescent materials, with emission lifetimes ranging from nanosecond to microsecond regimes.

Cited by 111 publications

References 69 publications

Lead‐Free Highly Efficient Blue‐Emitting Cs3Cu2I5 with 0D Electronic Structure

Lead‐Free Highly Efficient Blue‐Emitting Cs3Cu2I5 with 0D Electronic Structure

Synthesis, structures and photoluminescence properties of silver complexes of cyclic (alkyl)(amino)carbenes

Efficient Vacuum‐Processed Light‐Emitting Diodes Based on Carbene–Metal–Amides

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Lead‐Free Highly Efficient Blue‐Emitting Cs₃Cu₂I₅ with 0D Electronic Structure

Lead‐Free Highly Efficient Blue‐Emitting Cs₃Cu₂I₅ with 0D Electronic Structure