A5063917801- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Luminescence and Fluorescent Materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Perovskite Materials and Applications
- Low-power high-performance VLSI design
- Ionic liquids properties and applications
- Thin-Film Transistor Technologies
- Crystallography and molecular interactions
- Advanced Battery Technologies Research
- Surfactants and Colloidal Systems
- Pickering emulsions and particle stabilization
- Advancements in Battery Materials
- Lanthanide and Transition Metal Complexes
- Integrated Circuits and Semiconductor Failure Analysis
- Luminescence Properties of Advanced Materials
- Synthesis and Biological Evaluation
- Conducting polymers and applications
- Innovative Microfluidic and Catalytic Techniques Innovation
- Interactive and Immersive Displays
- Bluetooth and Wireless Communication Technologies
- Electrostatic Discharge in Electronics
- Catalytic Cross-Coupling Reactions
- Wireless Networks and Protocols
Kyushu University
2020-2025
National Tsing Hua University
2014-2024
Soochow University
2023
National Taipei University of Technology
2022
National Hsinchu University of Education
2021
Siemens (United States)
2020
University of Washington
2017-2019
Seattle University
2018
Mentor Technologies
2017
National Taiwan University of Science and Technology
2016
Organic light‐emitting diodes (OLEDs) exhibiting thermally activated delayed fluorescence (TADF) have attracted great interest because of their excellent exciton harvesting ability in electroluminescence (EL). While TADF‐OLEDs show a high EL efficiency, the device operational stability is not necessarily satisfactory for commercial applications. Herein, isotope effect host material on investigated. It unveiled that deuterated host, i.e., PYD2Cz‐ d 16 , forms denser film than nondeuterated...
Two new deep-blue narrowband multi-resonant emitters, 1B-DTACrs and 2B-DTACrs, one of which shows TADF, based on boron, nitrogen, oxygen doped nanographenes are reported.
In lithium-ion batteries (LIBs), conversion-based electrodes such as transition-metal oxides and sulfides exhibit promising characteristics including high capacity long cycle life. However, the main challenge for conversion to be industrialized remains on voltage hysteresis. this study, Mn3O4 powder was used an anode material LIBs investigate root cause of First, electrochemical reaction paths were found dominated by Mn/Mn2+ redox couple after first lithiation from galvanostatic...
Long-persistent luminescence (LPL) materials have applications from safety signage to bioimaging; however, existing organic LPL (OLPL) systems do not align with human scotopic vision, which is sensitive blue light. We present a strategy blueshift the emissions in binary OLPL by upconverting charge-transfer (CT) locally excited (LE) singlet state. Through rigorous steady-state and time-resolved photoluminescence spectroscopy wavelength-resolved thermoluminescence measurements, we provide...
Multiple‐resonance thermally activated delayed fluorescent (MR‐TADF) emitters have emerged as promising candidates for organic laser applications due to the potential simultaneously achieving large oscillator strength and triplet utilization. In this study, we investigate impact of peripheral tert‐butyl (t‐Bu)‐ phenyl (Ph)‐substituents on typical 9‐(phenylcarbazol‐3‐yl)‐9H‐carbazole‐3‐carbonitrile (CzBN) MR framework. While these modifications preserve frontier molecular orbital distribution...
Multiple‐resonance thermally activated delayed fluorescent (MR‐TADF) emitters have emerged as promising candidates for organic laser applications due to the potential simultaneously achieving large oscillator strength and triplet utilization. In this study, we investigate impact of peripheral tert‐butyl (t‐Bu)‐ phenyl (Ph)‐substituents on typical 9‐(phenylcarbazol‐3‐yl)‐9H‐carbazole‐3‐carbonitrile (CzBN) MR framework. While these modifications preserve frontier molecular orbital distribution...
Liquid crystalline 1-acetamido-3-alkylimidazolium bromide, hexafluorophosphate and tetrafluoroborate salts with 3-alkyl chains of carbon number n = 10, 12, 14, 16 18 were prepared. The single crystal structure the PF6− salt 12 self-organizes to form a framework hydrogen bonded ribbon polymer. mesomorphic behaviors these compounds studied by polarized optical microscopy, differential scanning calorimetry powder X-ray diffraction. presence extended bonding interactions in acetamidoimidazolium...
Carboxylic acid functionalized imidazolium salts, their deprotonated carboxylate zwitterions and acid-zwitterion adducts have been studied, are denoted as [N-Cn,N′-CO2H-Im][X] (Cn = CnH2n+1; X Cl−, Br−, BF4− PF6−), [N-Cn,N′-CO2-Im] [(N-Cn,N′-CO2-Im)2H][anion] (anion NO3− Br−), respectively. Crystal structures of [N-C10,N′-CO2-Im]Br [N-Cn,N′-CO2-Im]·2H2O studied by single-crystal X-ray diffraction indicate that carboxylic groups provide rich C–H⋯Br and/or C–H⋯O hydrogen bonding interactions...
We studied the photophysical and electroluminescent (EL) characteristics of a series azaborine derivatives having pair boron nitrogen aimed at multi-resonance (MR) effect. The computational study with STEOM-DLPNO-CCSD method clarified that combination BN ring-fusion terminal carbazole enhanced MR effect spin-orbit coupling matrix element (SOCME), simultaneously. Also, we second triplet excited state (T2) plays an important role in efficient MR-based thermally activated delayed fluorescence...
We demonstrate high-efficiency small-molecule-based white phosphorescent organic light emitting diodes (PHOLEDs) by single-active-layer solution-based processes with the current efficiency of 17.3 cdA-1 and maximum luminous 8.86 lmW-1 at a density 1 mA cm-2. The small-molecule based layers are codoped blue orange dyes. show that presence CsF/Al cathodes not only improves electron transport in oxadiazole-containing (ETLs), but also facilitates injection through reacted oxadiazole moiety to...
This work reports a new acceptor for constructing donor-acceptor type (D-A type) blue thermally activated delayed fluorescence (TADF) emitters with narrowed charge-transfer (CT) emissions. A core, carbazole-2-carbonitrile (CCN), is formed by the fusion of carbazole and benzonitrile. Three D-A TADF based on CCN acceptor, namely 3CzCCN, 3MeCzCCN, 3PhCzCCN, have been successfully synthesized characterized. These show deep-blue emissions from 439 to 457 nm high photoluminescence quantum yields...
In this study, three most commonly used commercial electrolyte compositions were selected to investigate the effect of different solvents on lithium-ion batteries (LIBs) with MnO2 anodes, including 1 M LiPF6 in EC/DEC = 1:1 (vol %), EC/EMC and EC/DMC/DEC 1:1:1 where EC, DEC, EMC, DMC represent ethylene carbonate, diethyl ethyl methyl dimethyl respectively. It was found that exhibits best performance solvents. Furthermore, adding 10 wt % fluoroethylene carbonate (FEC) additive into could...
An integrated low-output-ripple step-down DC-DC converter, which cascades a Buck converter with low-dropout regulator (LDO), is presented. The output of the can be used to supply digital circuits, while LDO power analog circuits. designed adaptively and automatically switch between pulse-width modulation (PWM) pulse-frequency (PFM) improve conversion efficiency over whole load current range. chip was implemented by TSMC 0.35μm 2P4M polycide CMOS process. measured maximal 280 mA, 100 mA.
We have probed under high pressure the C-H hydrogen bonds formed by N,N(')-disubstituted imidazolium ions having PF(6) (-) and Br(-) counterions. High-pressure infrared spectral profiles, x-ray crystallographic analysis, ab initio calculations allow us to make a vibrational assignment of these compounds. The appearance signal for free-NH unit (or weakly bonded N-H...F unit) in spectrum salt indicates that conventional N-H...O N-H...N do not fully dominate packing. It is likely...
Contrast-variation time-resolved small-angle neutron scattering (CV-SANS) was used to examine oil-exchange kinetics between identical mixtures of hydrogenated/deuterated hexadecane emulsion systems. Oil-exchange rates were estimated by transforming recorded profiles a relaxation function and fitting exponential decay models. We find that the process accelerated when droplets stabilized anionic surfactants even at concentrations well below surfactant critical micelle concentration. Moreover,...
Long-persistent luminescence (LPL) materials have applications from safety signage to bioimaging; however, existing organic LPL (OLPL) systems do not align with human scotopic vision, which is sensitive blue light. We reveal a ground-breaking strategy blueshift the emissions in binary OLPL by upconverting charge-transfer (CT) locally excited (LE) singlet state. Through rigorous steady-state and time-resolved photoluminescence spectroscopy wavelength-resolved thermoluminescence measurements,...
Narrowband emissive multiresonant thermally activated delayed fluorescence (MR-TADF) emit-ters are a promising solution to achieve the current industry targeted color standard, BT.2020, for blue without using optical filters, aiming high efficiency organic light-emitting di-odes (OLEDs). However, their long triplet lifetimes, largely affected by slow reverse inter-system crossing rates, adversely affect device stability. In this study, helical MR-TADF emitter (f-DOABNA) has been designed and...
Long-persistent luminescence (LPL) materials have applications from safety signage to bioimaging; however, existing organic LPL (OLPL) systems do not align with human scotopic vision, which is sensitive blue light. We reveal a ground-breaking strategy blueshift the emissions in binary OLPL by upconverting charge-transfer (CT) locally excited (LE) singlet state. Through rigorous steady-state and time-resolved photoluminescence spectroscopy wavelength-resolved thermoluminescence measurements,...
We designed and tested a calibrated ultrasound sample environment for<italic>in situ</italic>small-angle X-ray neutron scattering measurements.