A5058196543- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Lanthanide and Transition Metal Complexes
- Organic Electronics and Photovoltaics
- Molecular Sensors and Ion Detection
- Molecular Junctions and Nanostructures
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Conducting polymers and applications
Yamagata University
2017-2025
Yamagata Research Institute Of Technology
2018
Yamagata University Hospital
2017
All inorganic perovskites quantum dots (PeQDs) have attracted much attention for used in thin film display applications and solid-state lighting applications, owing to their narrow band emission with high photoluminescence yields (PLQYs), color tunability, solution processability. Here, we fabricated low-driving-voltage high-efficiency CsPbBr3 PeQDs light-emitting devices (PeQD-LEDs) using a washing process an ester solvent containing butyl acetate (AcOBu) remove excess ligands from the...
Cesium lead halide (CsPbX3, X = Cl, Br, or I) perovskite quantum dots (QDs) are known as ionic nanocrystals, and their optical properties greatly affected by the washing solvent used during purification process. Here, we demonstrate process of CsPbBr3 QDs using low-dielectric-constant solvents to completely remove impurities, such reaction desorbed ligands. The use ether diethylene glycol dimethyl (diglyme), having a low dielectric constant ε 7.23, poor for reprecipitation allowed multiple...
Abstract A highly luminescent mononuclear Al complex with β-diketone ligands exhibiting superior thermally activated delayed fluorescence (TADF) properties was developed in this work. The showed yellow emission promising photofunctions, including a near-unity photoluminescence quantum yield (PLQY), rapid radiative decay rate, and short lifetime the solid state. When applied solution-processed organic light-emitting device, an external efficiency (EQE) exceeding 18% low turn-on voltage of 2.9...
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The transition dipole moments of a heteroleptic iridium complex are actively controlled by using cyano-containing carbazole-based hosts. orientation ratio ( Θ ) is improved from 65% to 78%. value correlated with the T g host material.
Abstract Ubiquitous metal complexes with superior thermally activated delayed fluorescence (TADF) properties have emerged as promising candidates for light‐emitting materials due to their earth‐abundant nature and tunable optoelectronic characteristics. However, complexation often results in unfavorable solubility issues, which limit application solution‐processed OLEDs. Moreover, achieving a short‐delayed lifetime (τ d ) is essential further enhancing device performance small efficiency...
Abstract Although Earth‐abundant, ubiquitous, metal‐based thermally activated delayed fluorescence (TADF) complexes are among the most promising candidate materials for next‐generation organic light‐emitting devices (OLEDs), few explored. Herein, a highly emissive aluminum(III)‐TADF complex— Al(MCzDBM) 3 —with three β‐diketone ligands is presented as sensitizer multiresonance (MR)‐TADF emitters. This complex exhibited green emission with suitable photophysical functions sensitizer, such high...
Abstract The horizontal orientation of the emissive transition dipole moment (TDM) molecules is a crucial factor in improving efficiency organic light‐emitting diodes (OLEDs). However, mechanism this remains unclear. Herein, to elucidate TDM thermally activated delayed fluorescent (TADF) emitters, relationship between ratio (Θ) and key parameters stick‐like TADF emitters dispersed carbazole‐based host materials systematically quantitatively investigated. introduction functional groups...
Three phenylene-bridged MR-TADF emitters with different numbers of carbazole units are developed. These exhibit sky-blue emission around 480 nm a small FWHM ∼31 nm, near-unity PLQY, and an EQE nearly 30%.
A series of β-diketone-based TADF emitters named MCzX derivatives are designed and prepared. Among these emitters, MCzDBM exhibits a PLQY 79%, horizontal emission dipole orientation ratio 88%, high EQE approximately 25%.
Abstract In this study on perovskite solar cells (PVSCs), we incorporate N-benzylhydroxylamine (N-BzHoA) as an additive into the precursor solution. The addition of N-BzHoA suppressed formation unwanted PbI 2 and δ-phase without affecting band gap, confirming uniform large grains in film. fabricated inverted PVSCs exhibited remarkably improved properties compared to control device, with a power conversion efficiency 17.49%, reduced hysteresis, more than 89% retention initial capacity after...
All inorganic cesium lead halide perovskite with CsPbX <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (X = Cl - , Br <sup xmlns:xlink="http://www.w3.org/1999/xlink">-</sup> or I ) have been demonstrated a novel classified colloidal quantum dots (QDs). Perovskite QDs also expected great potential for the application in light-emitting devices (LEDs) due to their superior chemical stability, narrow emission spectra enable coverage next...
Here, we demonstrate anion-exchange red perovskite QDs CsPb(Br/I)3 from pristine CsPbBr3 using ammonium-iodine salts, long alkyl-based oleylammonium iodide (OAM-I) and aryl-based aniline hydoroiodide (An-HI), for use in highly efficient light-emitting devices (LEDs). The films exhibit a strong red-shift their of photoluminescence (PL) spectrum the green emission at 508 nm case to one deep-red region 649 owing replacement Br– anions by I–¬ QDs. LEDs formed based on OAM-I show an remarkable...