Bulky Iridium NHC Complexes for Bright, Efficient Deep-Blue OLEDs

Article Materials Science, Multidisciplinary

High Performance Solution-Processed Deep-Blue Phosphorescence Organic Light-Emitting Diodes with EQE Over 24% by Employing New Carbenic Ir(III) Complexes

Raja Kumaresan et al.

Summary: The introduction of new carbene-based Ir(III) complexes for solution-processed PHOLEDs has led to efficient devices with high EQE values and color purity.

ADVANCED OPTICAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Dipole Moment- and Molecular Orbital-Engineered Phosphine Oxide-Free Host Materials for Efficient and Stable Blue Thermally Activated Delayed Fluorescence

Soo-Ghang Ihn et al.

Summary: In order to achieve stable and efficient blue TADF devices, a novel approach for designing host molecules is proposed in this study, which involves adjusting factors such as molecular geometry and dipole moments to enhance the delayed fluorescence efficiency of TADF emitters. By engineering the hosts, significant improvements in both efficiency and stability of TADF devices can be achieved.

ADVANCED SCIENCE (2022)

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Article Nanoscience & Nanotechnology

Why Do We Still Need a Stable Long Lifetime Deep Blue OLED Emitter?

Andrew Monkman

Summary: This paper discusses the demand and potential applications of deep blue organic emitters. It highlights the advantages of the hyperfluorescence scheme based on new multiresonance boron nitrogen molecules, such as DABNA type emitters. The key requirements for suitable sensitizer hosts, especially the photophysical requirements for optimal performance, are also described.

ACS APPLIED MATERIALS & INTERFACES (2022)

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Article Chemistry, Inorganic & Nuclear

Regioselective Syntheses of Imidazo[4,5-b]pyrazin-2-ylidene-Based Chelates and Blue Emissive Iridium(III) Phosphors for Solution-Processed OLEDs

Jie Yan et al.

Summary: Six novel homoleptic Ir(III) complexes with imidazo-[4,5-b]pyrazin-2-ylidene chelates have been successfully designed and synthesized. These complexes exhibit narrowband blue and broadened green emission in degassed toluene solution, with high photoluminescent quantum yields. The tert-butylphenyl cyclometalate is found to be more electron donating than the N-phenyl cyclometalate, resulting in a red-shifted emission. Furthermore, OLED and hyper-OLED devices utilizing these complexes as dopants or sensitizers have demonstrated high external quantum efficiencies and narrowband emissions.

INORGANIC CHEMISTRY (2022)

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Article Chemistry, Multidisciplinary

Blue Phosphorescence and Hyperluminescence Generated from Imidazo[4,5-b]pyridin-2-ylidene-Based Iridium(III) Phosphors

Xilin Yang et al.

Summary: Four isomeric iridium metal complexes were successfully synthesized, and acid-induced isomerization was discovered to transform one isomer to another. Different isomers showed different effects on emission spectra. High photoluminescent efficiency and color coordinates were achieved in devices based on two isomeric compounds. OLEDs with one of the isomeric compounds as a sensitizing phosphor also exhibited high luminescence efficiency.

ADVANCED SCIENCE (2022)

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Article Materials Science, Multidisciplinary

Iridium(III) Phosphors-Bearing Functional 9-Phenyl7,9-dihydro-8H-purin-8-ylidene Chelates and Blue Hyperphosphorescent OLED Devices

Jibiao Jin et al.

Summary: In this research, a series of blue-emitting Ir(III) phosphors based on cyclometalating N-heterocyclic carbenes (NHCs) were reported. Experimental and theoretical characterization showed that these emitters have high photoluminescence quantum yields, short radiative lifetimes, and excellent photophysical characteristics. Furthermore, high-efficiency blue and true-blue hyperphosphorescent OLEDs were successfully achieved by utilizing these phosphors.

ADVANCED PHOTONICS RESEARCH (2022)

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Article Nanoscience & Nanotechnology

Homoleptic Ir(III) Phosphors with 2-Phenyl-1,2,4-triazol-3-ylidene Chelates for Efficient Blue Organic Light-Emitting Diodes

Caifa You et al.

Summary: In this study, two series of deep-blue-emitting homoleptic iridium(III) phosphors were synthesized using a different strategy to achieve high yields. The phosphors were examined through various spectroscopic and structural analysis methods, revealing their potential as deep-blue emitters for OLEDs. OLED devices based on these phosphors showed promising external quantum efficiencies and emission characteristics.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Review Materials Science, Multidisciplinary

Blue Emissive fac/mer-Iridium (III) NHC Carbene Complexes and their Application in OLEDs

Muazzam Idris et al.

Summary: The photophysical and electrochemical properties of N-heterocyclic carbene complexes of Iridium (III) were studied, showing differences in emission maxima and quantum yield in different solvents. The complexes exhibited efficient emission in polystyrene at room temperature and low temperatures. Notably, fac-Ir(tpz)(3) showed high external electroluminescence efficiency and brightness in blue phosphorescent organic light emitting diodes.

ADVANCED OPTICAL MATERIALS (2021)

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Article Chemistry, Inorganic & Nuclear

DFT vs. TDDFT vs. TDA to simulate phosphorescence spectra of Pt- and Ir-based complexes

Romain Schira et al.

Summary: This paper presents a comprehensive quantum investigation of the optical properties of twelve transition metal complexes using state-of-the-art (TD)DFT computations, with a focus on Pt-based and Ir-based complexes. The study found that unrestricted DFT and TDA outperformed TDDFT, especially in the presence of an Ir center, and the AH model accurately reproduced phosphorescence spectra. The simulation and experimental data are represented on a CIE chromaticity horseshoe in the end.

DALTON TRANSACTIONS (2021)

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Article Chemistry, Multidisciplinary

External Quantum Efficiency Exceeding 24% with CIEy Value of 0.08 using a Novel Carbene-Based Iridium Complex in Deep-Blue Phosphorescent Organic Light-Emitting Diodes

Ho-Yeol Park et al.

ADVANCED MATERIALS (2020)

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Review Chemistry, Inorganic & Nuclear

PhosphorescentTris-Bidentate IrIIIComplexes with N-Heterocyclic Carbene Scaffolds: Structural Diversity and Optical Properties

Anna Bonfiglio et al.

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (2020)

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Article Chemistry, Physical

Theoretical investigation on green emitting heteroleptic cyclometalated iridium(III) complexes with fluorinated 2-phenylpyridine ligands

Mohamed Naoui et al.

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY (2020)

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Review Materials Science, Multidisciplinary

Charge carrier traps in organic semiconductors: a review on the underlying physics and impact on electronic devices

Hamna F. Haneef et al.

JOURNAL OF MATERIALS CHEMISTRY C (2020)

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Article Chemistry, Multidisciplinary

A bipolar host based high triplet energy electroplex for an over 10 000 h lifetime in pure blue phosphorescent organic light-emitting diodes

Mina Jung et al.

MATERIALS HORIZONS (2020)

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Article Chemistry, Multidisciplinary

Efficient Blue Phosphorescent OLEDs with Improved Stability and Color Purity through Judicious Triplet Exciton Management

Kody Klimes et al.

ADVANCED FUNCTIONAL MATERIALS (2019)

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Article Materials Science, Multidisciplinary

Simultaneous Achievement of High Efficiency and Long Lifetime in Deep Blue Phosphorescent Organic Light-Emitting Diodes

Kyung Hyun Choi et al.

ADVANCED OPTICAL MATERIALS (2019)

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Editorial Material Optics

Best practices for measuring emerging light-emitting diode technologies

Miguel Anaya et al.

NATURE PHOTONICS (2019)

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Article Chemistry, Physical

Photophysical properties of structural isomers of homoleptic Ir-complexes derived from xylenyl-substituted N-heterocyclic carbene ligands

Bo-Sun Yun et al.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS (2019)

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Article Chemistry, Multidisciplinary

Accurate computations to simulate the phosphorescence spectra of large transition complexes: simulated colors match experiment

Adrien Stoliaroff et al.

NEW JOURNAL OF CHEMISTRY (2019)

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Article Chemistry, Medicinal

Computational simulation of vibrationally resolved spectra for spin-forbidden transitions

Franco Egidi et al.

CHIRALITY (2018)

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Article Chemistry, Applied

Pure blue phosphorescence by new N-heterocyclic carbene-based Ir(III) complexes for organic light-emitting diode application

Ganguri Sarada et al.

DYES AND PIGMENTS (2018)

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Article Chemistry, Inorganic & Nuclear

Nonradiative Decay and Stability of N-Heterocyclic Carbene Iridium(III) Complexes

Xiuwen Zhou et al.

INORGANIC CHEMISTRY (2018)

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Article Materials Science, Multidisciplinary

Theoretical study on the vibrationally resolved spectra and quantum yield of blue phosphorescent iridium(III) complexes with 2-(4-fluoro-3-(trifluoromethyl)-phenyl)pyridine as the cyclometalated ligand

Jiayi Guo et al.

ORGANIC ELECTRONICS (2018)

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Article Multidisciplinary Sciences

Degradation of blue-phosphorescent organic light-emitting devices involves exciton-induced generation of polaron pair within emitting layers

Sinheui Kim et al.

NATURE COMMUNICATIONS (2018)

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Article Multidisciplinary Sciences

Three-terminal RGB full-color OLED pixels for ultrahigh density displays

Markus Froebel et al.

SCIENTIFIC REPORTS (2018)

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Article Chemistry, Multidisciplinary

High Efficiency Deep-Blue Phosphorescent Organic Light-Emitting Diodes with CIE x, y (<= 0.15) and Low Efficiency Roll-Off by Employing a High Triplet Energy Bipolar Host Material

Athithan Maheshwaran et al.

ADVANCED FUNCTIONAL MATERIALS (2018)

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Article Chemistry, Inorganic & Nuclear

Facial and Meridional Isomers of Tris(bidentate) Ir(III) Complexes: Unravelling Their Different Excited State Reactivity

Sylvio Arroliga-Rocha et al.

INORGANIC CHEMISTRY (2018)

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Article Chemistry, Multidisciplinary

High-Efficiency Deep-Blue-Emitting Organic Light-Emitting Diodes Based on Iridium(III) Carbene Complexes

Amlan K. Pal et al.

ADVANCED MATERIALS (2018)

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Article Materials Science, Multidisciplinary

Degradation mechanism study and electron scattering device structure for long lifetime in blue phosphorescent organic light-emitting diodes

Wook Song et al.

ORGANIC ELECTRONICS (2017)

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Article Chemistry, Physical

Comprehensive approach to simulate vibrationally resolved phosphorescence spectra of gold(III) complexes using DFT including temperature effects

Hayat Ayache et al.

THEORETICAL CHEMISTRY ACCOUNTS (2017)

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Article Chemistry, Multidisciplinary

The short device lifetimes of blue PhOLEDs: insights into the photostability of blue Ir(III) complexes

Denis Jacquemin et al.

CHEMICAL SCIENCE (2017)

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Article Materials Science, Multidisciplinary

Probing photophysical properties of isomeric N-heterocyclic carbene Ir(III) complexes and their applications to deep-blue phosphorescent organic light-emitting diodes

Yang-Jin Cho et al.

JOURNAL OF MATERIALS CHEMISTRY C (2017)

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Article Chemistry, Multidisciplinary

An Alternative Host Material for Long-Lifespan Blue Organic Light-Emitting Diodes Using Thermally Activated Delayed Fluorescence

Soo-Ghang Ihn et al.

ADVANCED SCIENCE (2017)

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Article Nanoscience & Nanotechnology

Cyclometalated Iridium(III) Carbene Phosphors for Highly Efficient Blue Organic Light-Emitting Diodes

Zhao Chen et al.

ACS APPLIED MATERIALS & INTERFACES (2017)

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Article Chemistry, Multidisciplinary

Twist it! The acid-dependent isomerization of homoleptic carbenic iridium(III) complexes

Jaroslaw G. Osiak et al.

CHEMICAL COMMUNICATIONS (2017)

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Article Chemistry, Multidisciplinary

Lessons learned in tuning the optoelectronic properties of phosphorescent iridium(III) complexes

Adam F. Henwood et al.

CHEMICAL COMMUNICATIONS (2017)

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Article Chemistry, Physical

Deep blue phosphorescent organic light-emitting diodes with very high brightness and efficiency

Jaesang Lee et al.

NATURE MATERIALS (2016)

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Article Chemistry, Inorganic & Nuclear

Vibronic Coupling Investigation to Compute Phosphorescence Spectra of Pt(II) Complexes

Fanny Vazart et al.

INORGANIC CHEMISTRY (2015)

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Article Materials Science, Multidisciplinary

Exciton-Polaron-Induced Aggregation of Organic Electroluminescent Materials: A Major Degradation Mechanism in Wide-Bandgap Phosphorescent and Fluorescent Organic Light-Emitting Devices

Qi Wang et al.

ADVANCED OPTICAL MATERIALS (2015)

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Article Chemistry, Physical

In Situ Observation of Degradation by Ligand Substitution in Small-Molecule Phosphorescent Organic Light-Emitting Diodes

Matthew J. Jurow et al.

CHEMISTRY OF MATERIALS (2014)

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Article Chemistry, Inorganic & Nuclear

Structure-property relationships based on Hammett constants in cyclometalated iridium(III) complexes: their application to the design of a fluorine-free FIrPic-like emitter

Julien Frey et al.

DALTON TRANSACTIONS (2014)

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Article Multidisciplinary Sciences

Tenfold increase in the lifetime of blue phosphorescent organic light-emitting diodes

Yifan Zhang et al.

NATURE COMMUNICATIONS (2014)

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Article Chemistry, Physical

Phosphine oxide derivatives for organic light emitting diodes

Soon Ok Jeon et al.

JOURNAL OF MATERIALS CHEMISTRY (2012)

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Article Chemistry, Physical

Implementation and validation of a multi-purpose virtual spectrometer for large systems in complex environments

Vincenzo Barone et al.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS (2012)

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Article Chemistry, Multidisciplinary

Electrochemical Considerations for Determining Absolute Frontier Orbital Energy Levels of Conjugated Polymers for Solar Cell Applications

Claudia M. Cardona et al.

ADVANCED MATERIALS (2011)

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Article Chemistry, Multidisciplinary

External Quantum Efficiency Above 20% in Deep Blue Phosphorescent Organic Light-Emitting Diodes

Soon Ok Jeon et al.

ADVANCED MATERIALS (2011)

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Article Materials Science, Multidisciplinary

Effects of carrier trapping and scattering on hole transport properties of N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine thin films

Bixin Li et al.

ORGANIC ELECTRONICS (2011)

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Article Physics, Applied

Causes of efficiency roll-off in phosphorescent organic light emitting devices: Triplet-triplet annihilation versus triplet-polaron quenching

Dandan Song et al.

APPLIED PHYSICS LETTERS (2010)

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Review Chemistry, Multidisciplinary

Transition-metal phosphors with cyclometalating ligands: fundamentals and applications

Yun Chi et al.

CHEMICAL SOCIETY REVIEWS (2010)

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Article Chemistry, Inorganic & Nuclear

Synthesis and Photophysical Properties of Substituted Tris(phenylbenzimidazolinato) IrIII Carbene Complexes as a Blue Phosphorescent Material

Kazuyoshi Tsuchiya et al.

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (2010)

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Article Physics, Applied

Direct evidence for degradation of polaron excited states in organic light emitting diodes

N. C. Giebink et al.

JOURNAL OF APPLIED PHYSICS (2009)

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Article Chemistry, Physical

Fully Integrated Approach to Compute Vibrationally Resolved Optical Spectra: From Small Molecules to Macrosystems

Vincenzo Barone et al.

JOURNAL OF CHEMICAL THEORY AND COMPUTATION (2009)

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Article Chemistry, Inorganic & Nuclear

Fluorine cleavage of the light blue heteroleptic triplet emitter FIrpic

Varatharajan Sivasubramaniam et al.

JOURNAL OF FLUORINE CHEMISTRY (2009)

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Article Physics, Applied

Intrinsic luminance loss in phosphorescent small-molecule organic light emitting devices due to bimolecular annihilation reactions

N. C. Giebink et al.

JOURNAL OF APPLIED PHYSICS (2008)

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Article Physics, Applied

Reduced efficiency roll-off in phosphorescent organic light emitting diodes by suppression of triplet-triplet annihilation

Sebastian Reineke et al.

APPLIED PHYSICS LETTERS (2007)

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Article Chemistry, Multidisciplinary

Influence of substituents on the energy and nature of the lowest excited states of heteroleptic phosphorescent Ir(III) complexes: A joint theoretical and experimental study

Igor Avilov et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2007)

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Article Chemistry, Physical

Effective method to compute Franck-Condon integrals for optical spectra of large molecules in solution

Fabrizio Santoro et al.

JOURNAL OF CHEMICAL PHYSICS (2007)

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Article Physics, Applied

Operational degradation of organic light-emitting diodes: Mechanism and identification of chemical products

D. Y. Kondakov et al.

JOURNAL OF APPLIED PHYSICS (2007)

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Review Chemistry, Multidisciplinary

Highly efficient organic devices based on electrically doped transport layers

K. Walzer et al.

CHEMICAL REVIEWS (2007)

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Article Physics, Applied

Saturated deep blue organic electrophosphorescence using a fluorine-free emitter

RJ Holmes et al.

APPLIED PHYSICS LETTERS (2005)

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Article Chemistry, Inorganic & Nuclear

Blue and near-UV phosphorescence from iridium complexes with cyclometalated pyrazolyl or N-heterocyclic carbene ligands

T Sajoto et al.

INORGANIC CHEMISTRY (2005)

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Article Chemistry, Multidisciplinary

Encapsulated cores: Host-free organic light-emitting diodes based on solution-processible electrophosphorescent dendrimers

SC Lo et al.

ADVANCED MATERIALS (2005)

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Article Chemistry, Organic

Suzuki-Miyaura coupling with high turnover number using an N-acyl-N-heterocyclic carbene palladacycle precursor

H Palencia et al.

TETRAHEDRON LETTERS (2004)

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Article Chemistry, Multidisciplinary

Energies, structures, and electronic properties of molecules in solution with the C-PCM solvation model

M Cossi et al.

JOURNAL OF COMPUTATIONAL CHEMISTRY (2003)

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Article Chemistry, Physical

Time-dependent density functional theory for molecules in liquid solutions

M Cossi et al.

JOURNAL OF CHEMICAL PHYSICS (2001)

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Article Materials Science, Multidisciplinary

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

MA Baldo et al.

PHYSICAL REVIEW B (2000)

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Bulky Iridium NHC Complexes for Bright, Efficient Deep-Blue OLEDs

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