Efficient deep blue emitter based on carbazole-pyrene hybrid for non-doped electroluminescent device

Zhang, Ting; Ye, Jieyang; Luo, Ansheng; Liu, Di

doi:10.1016/j.optmat.2019.109632

Cited by 11 publications

(5 citation statements)

References 36 publications

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“…In addition, the NHC ligands’ characteristics of weak π-acceptance and strong σ-donation render them as excellent modulators for transition metals, imparting an enhanced stability to cyclometalated complexes that contain strong metal–NHC bonds. A second class of ligands that have been broadly used in the design of blue triplet emitters is based on carbazole, which is a well-known electron-rich molecule with high triplet state energy and excellent hole-transporting capacity. − The promising nature of these two ligand families underscores an interest in combining both types within a single architecture. Thus, we speculated that platinum complexes bearing both N -pyridyl carbazole and alkyl-bridged bis-NHC ligands may exhibit promising deep blue emission.…”

Section: Introductionmentioning

confidence: 99%

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

et al. 2022

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The utilization of deep blue phosphorescent materials in high-performance displays and solid-state lighting requires high quantum efficiencies and color purities. Here, we describe the preparation and luminescent properties of novel platinum triplet emitters featuring cyclometalated N-pyridyl-carbazole ligands functionalized with closo-monocarborane clusters [CB 11 H 12 ] − . All reported complexes were fully characterized by using standard small molecule techniques (UV−vis, cyclic voltammetry, nuclear magnetic resonance (NMR), high-resolution mass spectrometry (HRMS)), and their solid-state structures were elucidated by X-ray diffraction. These platinum phosphors emit in the blue region of the visible wavelength spectrum in both the solid and solution states. Complex 4a exhibits the highest luminous efficiency at λ em = 439 nm with a photoluminescent quantum yield (PLQY) of 60% by dispersing in a PMMA matrix. Electrochemical and computational studies of complexes 4a and 4b revealed that the blue phosphorescence originates mainly from intraligand 3 π → π* ( 3 ILCT) transitions with relatively small 3 MLCT mixing. A deep-blue OLED containing 4a as the light-emitting dopant was successfully fabricated using a solution-processed method, and the device exhibited blue photoluminescence with CIE coordinates of (0.17, 0.15) and a maximum external quantum efficiency (EQE max ) value of 6.2%. This article represents the pioneering study of a deep blue PhOLED using a Pt complex bearing a closo-monocarborane anion substituent, providing a new avenue into the preparation of novel triplet emitters based on boron-rich cluster anions.

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Section: Introductionmentioning

confidence: 99%

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

et al. 2022

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“…Palladium (Pd) catalyst has been currently used in modern organic syntheses in various fields, including the synthesis of advanced materials, 1 natural products 2 and ligands 3 through reduction reactions and cross-coupling reactions (such as Suzuki coupling, Negishi coupling, Heck reaction etc.) due to its high catalytic activity and high selectivity.…”

Section: Introductionmentioning

confidence: 99%

Palladium‐immobilized polymer‐coated magnetic nanocomposites as reusable catalysts for the reduction of 4‐nitrophenol

Mahanitipong

Rutnakornpituk

2022

Polymer International

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Palladium‐immobilized polymer‐coated magnetic nanoparticles (MNP@polymer‐Pd) were successfully synthesized for use as reusable catalysts for the reduction of 4‐nitrophenol (4NP) in water. The homopolymers and copolymers (e.g. poly(poly(ethylene glycol) methacrylate), PPEGMA; poly(2‐dimethylamino)ethyl methacrylate, PDMAEMA; and poly(2‐diethylamino)ethyl methacrylate, PDEAEMA) were well designed to chemically graft on the surface of the magnetite nanoparticles (MNPs) with the rationalization that PPEGMA improved their water dispersibility and the amino‐containing polymers, e.g. PDMAEMA and PDEAEMA, enhanced the coordinating interaction with Pd and essentially improved their recycling efficiency. The presence of Pd and Fe in the nanocomposites was confirmed via energy‐dispersive X‐ray spectroscopy. The nanocomposites possessed Pd loadings ranging between 0.7006 and 0.8442 mmol g–1. The nanocomposites containing PDMAEMA or PDEAEMA showed higher immobilization efficiency of Pd on their surface than those without these amino‐containing polymers. Interestingly, the nanocomposites having PDEAEMA exhibited an improved catalytic activity for the 4NP reduction compared to those having PDMAEMA. They displayed sustainable reusability for the 4NP reduction after eight cycles without a significant loss in their catalytic performance (99% conversion). © 2022 Society of Industrial Chemistry.

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“…Furthermore, there are known examples of carbazole−pyrene hybrid compounds for dye-sensitized solar cell applications, 24 OLEDs, 25−29 and electroluminescent devices. 30 In addition to the impressive impact of both chromophores in materials science, the major inspiration for our research was the fact that once they are bridged together by a dimethylsilyl linker, they exhibit dual ICT emission that spreads all over the visible range.…”

Section: Introductionmentioning

confidence: 99%

“…The components of the chosen dyad (carbazole derivative and pyrene) were selected because they play a pivotal role in many areas of photophysics and optoelectronics. − These popular polycyclic aromatic hydrocarbons and their various derivatives (including silicon-based carbazole ,− and pyrene-containing compounds − ) have found application in optoelectronics, solar cells, TADF and organic light-emitting diode (OLED) materials, or fluorescent probes for elucidation of the geometries of various biomolecules. , There are also interesting studies that report white-light emission from pyrene-based compounds, − and many of them are related to aggregation-induced emission. Furthermore, there are known examples of carbazole–pyrene hybrid compounds for dye-sensitized solar cell applications, OLEDs, − and electroluminescent devices …”

Section: Introductionmentioning

confidence: 99%

White Light from Dual Intramolecular Charge-Transfer Emission in a Silylene-Bridged Styrylcarbazole and Pyrene Dyad

et al. 2021

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Styrylcarbazole linked to pyrene by a dimethylsilyl bridge was synthesized in the search for new charge-transfer active materials for LED applications. In the course of a photophysical study, it turned out that such a donor-bridge-acceptor compound displayed three completely different types of emission depending on solvent polarity. The most attractive emission properties were found in acetonitrile in which two broad emission bands were observed. The resolved mechanism of the excited-state processes in acetonitrile was supported by singular value decomposition with self-modeling treatment of time-resolved emission spectra (ns-TCSPC). The data analysis revealed that there were two excited-state processes, that is, charge transfer within styrylcarbazole and electron transfer from styrylcarbazole to pyrene through a silylene bridge that was responsible for a broad dual emission. The general idea of designing compounds that display emission from more than one excited state covering a wide range of the visible spectrum can be a powerful tool in designing new white-light-emitting materials.

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Efficient deep blue emitter based on carbazole-pyrene hybrid for non-doped electroluminescent device

Cited by 11 publications

References 36 publications

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

Palladium‐immobilized polymer‐coated magnetic nanocomposites as reusable catalysts for the reduction of 4‐nitrophenol

White Light from Dual Intramolecular Charge-Transfer Emission in a Silylene-Bridged Styrylcarbazole and Pyrene Dyad

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Efficient deep blue emitter based on carbazole-pyrene hybrid for non-doped electroluminescent device

Cited by 11 publications

References 36 publications

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB11H12–)

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB11H12–)

Palladium‐immobilized polymer‐coated magnetic nanocomposites as reusable catalysts for the reduction of 4‐nitrophenol

White Light from Dual Intramolecular Charge-Transfer Emission in a Silylene-Bridged Styrylcarbazole and Pyrene Dyad

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Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)

Deep Blue Phosphorescence from Platinum Complexes Featuring Cyclometalated N-Pyridyl Carbazole Ligands with Monocarborane Clusters (CB₁₁H₁₂^–)