Recent progress in functionalized electrophosphorescent iridium(III) complexes

Han, Fuquan; Han, Chunmiao; Xu, Hui

doi:10.1016/j.cclet.2016.07.009

Cited by 13 publications

(3 citation statements)

References 67 publications

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“…Among the most common and best efficient emitters, there are three types named phosphorescent, fluorescent and TADF emitters. Due to impressively high efficiencies reported in the recent years [2][3][4], phosphorescent and TADF emitters may appear to be best suited for high-brightness microdisplay applications. However, the choice is not simple because high efficiencies are typically accompanied by broad spectra, tremendous efficiency roll-off at higher brightness and low lifetimes.…”

Section: Green Oled Featuring High Brightness and Narrow Spectramentioning

confidence: 99%

OLED microdisplays in near-to-eye applications: challenges and solutions

et al. 2017

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Wearable augmented-reality (AR) has already started to be used productively mainly in manufacturing industry and logistics. Next step will be to move wearable AR from "professionals to citizens" by enabling networked, everywhere augmented-reality (in-/outdoor localisation, scene recognition, cloud access,…) which is non-intrusive, exhibits intuitive user-interaction, anytime safe and secure use, and considers personal privacy protection (user's and others). Various hardware improvements (e.g., low-power, seamless interactivity, small form factor, ergonomics,…), as well as connectivity and network integration will become vital for consumer adoption.Smart-Glasses (i.e., near-to-eye (NTE) displays) have evolved as major devices for wearable AR, that hold potential to become adopted by consumers soon. Tiny microdisplays are a key component of smart-glasses, e.g., creating images from organic light emitting diodes (OLED), that have become popular in mobile phone displays. All microdisplay technologies on the market comprise an image-creating pixel modulation, but only the emissive ones (for example, OLED and LED) feature the image and light source in a single device, and therefore do not require an external light source. This minimizes system size and power consumption, while providing exceptional contrast and color space.These advantages make OLED microdisplays a perfect fit for near-eye applications. Low-power active-matrix circuitry CMOS backplane architecture, embedded sensors, emission spectra outside the visible and high-resolution sub-pixel micro-patterning address some of the application challenges (e.g., long battery life, sun-light readability, user interaction modes) and enable advanced features for OLED microdisplays in near-to-eye displays, e.g., upcoming connected augmented-reality smart glasses. This report is to analyze the challenges in addressing those features and discuss solutions.

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Section: Green Oled Featuring High Brightness and Narrow Spectramentioning

confidence: 99%

OLED microdisplays in near-to-eye applications: challenges and solutions

et al. 2017

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“…For instance, red, green or blue emissive phosphorescent Ir complexes in OLEDs with relatively high triplet energy typically show little or no absorption in the visible to near-infrared light range, where solar energy covers most. 18,19 On the other hand, Ir complexes with broad and strong optical absorption inevitably exhibit large ligand conjugation and strengthened intra-ligand charge transfer (CT), which induced severe triplet CT state energy loss to greatly reduce the PCE for the relevant D/A blended OSCs. 20,21 Therefore, it is challenging to develop highly efficient photovoltaic materials based on small-molecule heavy metal Ir complexes.…”

Section: Introductionmentioning

confidence: 99%

Significant differences in photophysical and photovoltaic properties of flexible chain terminated homoleptic tris-Ir(iii) complexes

You,

Yang,

Zhou

et al. 2024

J. Mater. Chem. C

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“…During electrolysis, iridium catalyses the oxygen evolution half reaction [3,4]. Although homoleptic tris( β -diketonato)iridium(III) complexes are almost unheard of in literature with only a handful of reports available [5,6], heteroleptic Ir(III) complexes containing a chelating β -diketonato ligand in addition to N- and C- bonding ligands have been extensively studied [7]. Complexes incorporating heavy transition metals such as platinum [8], osmium [9] and iridium [10,11] have been employed as emitters in electroluminescence devices, of which the iridium complexes are generally the most effective.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Spectroscopy and Electrochemistry in Relation to DFT Computed Energies of Ferrocene- and Ruthenocene-Containing β-Diketonato Iridium(III) Heteroleptic Complexes. Structure of [(2-Pyridylphenyl)2Ir(RcCOCHCOCH3]

et al. 2019

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A series of new ferrocene- and ruthenocene-containing iridium(III) heteroleptic complexes of the type [(ppy)2Ir(RCOCHCOR′)], with ppy = 2-pyridylphenyl, R = Fc = FeII(η5-C5H4)(η5-C5H5) and R′ = CH3 (1) or Fc (2), as well as R = Rc = RuII(η5-C5H4)(η5-C5H5) and R′ = CH3 (3), Rc (4) or Fc (5) was synthesized via the reaction of appropriate metallocene-containing β-diketonato ligands with [(ppy)2(μ-Cl)Ir]2. The single crystal structure of 3 (monoclinic, P21/n, Z = 4) is described. Complexes 1–5 absorb light strongly in the region 280−480 nm the metallocenyl β-diketonato substituents quench phosphorescence in 1–5. Cyclic and square wave voltammetric studies in CH2Cl2/[N(nBu)4][B(C6F5)4] allowed observation of a reversible IrIII/IV redox couple as well as well-resolved ferrocenyl (Fc) and ruthenocenyl (Rc) one-electron transfer steps in 1−5. The sequence of redox events is in the order Fc oxidation, then IrIII oxidation and finally ruthenocene oxidation, all in one-electron transfer steps. Generation of IrIV quenched phosphorescence in 6, [(ppy)2Ir(H3CCOCHCOCH3)]. This study made it possible to predict the IrIII/IV formal reduction potential from Gordy scale group electronegativities, χR and/or ΣχR′ of β-diketonato pendent side groups as well as from DFT-calculated energies of the highest occupied molecular orbital of the species involved in the IrIII/IV oxidation at a 98% accuracy level.

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Recent progress in functionalized electrophosphorescent iridium(III) complexes

Cited by 13 publications

References 67 publications

OLED microdisplays in near-to-eye applications: challenges and solutions

OLED microdisplays in near-to-eye applications: challenges and solutions

Significant differences in photophysical and photovoltaic properties of flexible chain terminated homoleptic tris-Ir(iii) complexes

Synthesis, Spectroscopy and Electrochemistry in Relation to DFT Computed Energies of Ferrocene- and Ruthenocene-Containing β-Diketonato Iridium(III) Heteroleptic Complexes. Structure of [(2-Pyridylphenyl)2Ir(RcCOCHCOCH3]

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