Environmental Control of Triplet Emission in Donor–Bridge–Acceptor Organometallics

  title={Environmental Control of Triplet Emission in Donor–Bridge–Acceptor Organometallics},
  author={Jiale Feng and Lupeng Yang and Alexander S. Romanov and Jirawit Ratanapreechachai and Antti‐Pekka M. Reponen and Saul T. E. Jones and Mikko Linnolahti and Timothy J. H. Hele and Anna K{\"o}hler and Heinz B{\"a}ssler and Manfred Bochmann and Dan Credgington},
  journal={Advanced Functional Materials},
Carbene‐metal‐amides (CMAs) are a promising family of donor–bridge–acceptor molecular charge‐transfer (CT) emitters for organic light‐emitting diodes. A universal approach is demonstrated to tune the energy of their CT emission. A blueshift of up to 210 meV is achievable in solid state via dilution in a polar host matrix. The origin of this shift has two components: constraint of thermally‐activated triplet diffusion, and electrostatic interactions between guest and polar host. This allows the… 
20 Citations

Donor N‐Substitution as Design Principle for Fast and Blue Luminescence in Carbene‐Metal‐Amides

A series of gold‐centered carbene‐metal‐amide (CMA) complexes are synthesized with the carbazole donor ligand modified by substitution with nitrogen atoms in varying positions. The luminescence of

Matrix‐Free Hyperfluorescent Organic Light‐Emitting Diodes Based on Carbene–Metal–Amides

A wide‐gap host matrix is a major obstacle detrimentally influencing the performance of hyperfluorescent organic light‐emitting diodes since it substantially increases driving voltage. Moreover,

Thermally Activated Delayed Fluorescence from d10‐Metal Carbene Complexes through Intermolecular Charge Transfer and Multicolor Emission with a Monomer–Dimer Equilibrium

A series of two‐coordinate AuI and CuI complexes reported as new organometallic thermally activated delayed fluorescence (TADF) emitters, based on the carbene–metal–carbazole model with a pyridine‐fused 1,2,3‐triazolylidene (PyTz) ligand exhibit efficient TADF with microsecond lifetimes.

π-Extended Ligands in Two-Coordinate Coinage Metal Complexes.

Two-coordinate carbene-MI-amide (cMa, MI = Cu, Ag, Au) complexes have emerged as highly efficient luminescent materials for use in a variety of photonic applications due to their extremely fast

Influence of Heavy Atom Effect on the Photophysics of Coinage Metal Carbene‐Metal‐Amide Emitters

The effect of the heavy metal atom on the photophysics of carbene‐metal‐amide (CMA) photoemitters is explored, where the metal bridge is either Au, Ag, or Cu. Spectroscopic investigations reveal the

A quantum dynamics study of the hyperfluorescence mechanism

Triplet state harvesting using thermally-activated delayed fluorescence (TADF) combined with efficient Forster resonant energy transfer (FRET) to a narrow fluorescent emitter is seen as a promising

Excited-State Lifetime Modulation by Twisted and Tilted Molecular Design in Carbene-Metal-Amide Photoemitters

Carbene–metal–amides (CMAs) are an emerging class of photoemitters based on a linear donor–linker–acceptor arrangement. They exhibit high flexibility about the carbene–metal and metal–amide bonds,

Cyclometalated Spirobifluorene Imidazolylidene Platinum(II) Complexes with Predominant 3LC Emissive Character and High Photoluminescence Quantum Yields.

Two novel bidentate C^C*spiro cyclometalated platinum(II) complexes comprising a spiro-conjugated bifluorene ligand and different β-diketonate auxiliary ligands are synthesized and characterized.

Understanding and Designing Thermally Activated Delayed Fluorescence Emitters: Beyond the Energy Gap Approximation.

The significant progress that has been made in the development of molecules exhibiting Thermally Activated Delayed Fluorescence is highlighted, but the significant challenges which persist are outlined to achieve a full understanding of the TADF mechanism and improve the stability and performance of these materials.

Thiazoline Carbene-Cu(I)-Amide complexes: Efficient White Electroluminescence from Combined Monomer and Excimer Emission.

Luminescent carbene-metal-amide complexes bearing group 11 metals (Cu, Ag, Au) have recently attracted great attention due to their exceptional emission efficiency and high radiative decay rates



Highly efficient light-emitting diodes based on intramolecular rotation

The efficiency of an organic light-emitting diode (OLED) is fundamentally governed by the spin of recombining electron-hole pairs (singlet and triplet excitons), since triplets cannot usually emit

Mononuclear Silver Complexes for Efficient Solution and Vacuum‐Processed OLEDs

Carbene metal amides are a new class of highly efficient light‐emitting molecules based on a linear donor–metal–acceptor geometry. Here the synthesis, structure, and photo‐ and electroluminescence of

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

Electroluminescence (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 to sky blue without changing dopant.

Vibrationally Assisted Intersystem Crossing in Benchmark Thermally Activated Delayed Fluorescence Molecules.

Electrically injected charge carriers in organic light-emitting devices (OLEDs) undergo recombination events to form singlet and triplet states in a 1:3 ratio, representing a fundamental hurdle for

Carbene-Metal-Amide Bond Deformation, Rather Than Ligand Rotation, Drives Delayed Fluorescence.

It is clarified that the reverse intersystem crossing triggering delayed fluorescence occurs around the coplanar triplet geometric optimum.

The role of solid state solvation on the charge transfer state of a thermally activated delayed fluorescence emitter

The influence of solid state solvation is crucial for understanding the device properties of 3rd generation organic light emitting diodes (OLEDs) based upon thermally activated delayed fluorescence

Thermally Activated Delayed Fluorescence Materials Towards the Breakthrough of Organoelectronics

An overview of the quick development in TADF mechanisms, materials, and applications is presented, with a particular emphasis on their different types of metal-organic complexes, D-A molecules, and fullerenes.

Ultrafast Structure and Dynamics in the Thermally Activated Delayed Fluorescence of a Carbene-Metal-Amide.

Ultrafast time-resolved transient absorption and Raman studies of CMA photodynamics reveal complex structural evolution following intersystem crossing, and a change in the low-frequency vibrational spectrum between singlet and triplet states.

Transient analysis of organic electrophosphorescence. II. Transient analysis of triplet-triplet annihilation

In the preceding paper, Paper I [Phys. Rev. B 62, 10 958 (2000)], we studied the formation and diffusion of excitons in several phosphorescent guest-host molecular organic systems. In this paper, we

Highly efficient organic light-emitting diodes from delayed fluorescence

A class of metal-free organic electroluminescent molecules in which the energy gap between the singlet and triplet excited states is minimized by design, thereby promoting highly efficient spin up-conversion from non-radiative triplet states to radiative singlet states while maintaining high radiative decay rates.