A5083479306- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Organic Electronics and Photovoltaics
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Molecular Junctions and Nanostructures
- Conducting polymers and applications
- Spectroscopy and Chemometric Analyses
- Advanced Chemical Sensor Technologies
- Nanowire Synthesis and Applications
- Lanthanide and Transition Metal Complexes
- Optical Network Technologies
- Perovskite Materials and Applications
- Piezoelectric Actuators and Control
- Quantum and electron transport phenomena
- Nanofabrication and Lithography Techniques
- Force Microscopy Techniques and Applications
- Iterative Learning Control Systems
- Advanced Photocatalysis Techniques
- Plasmonic and Surface Plasmon Research
- Photochromic and Fluorescence Chemistry
- Spectroscopy Techniques in Biomedical and Chemical Research
- Metamaterials and Metasurfaces Applications
Ji Hua Laboratory
2020-2025
Jinhua Academy of Agricultural Sciences
2024
Harvard University
2020-2021
Technical University of Munich
2012-2021
Harbin Institute of Technology
2015-2020
Harvard University Press
2020
Harbin University
2015
Jilin University
2009-2011
State Key Laboratory of Supramolecular Structure and Materials
2009-2011
The University of Texas at Austin
2004-2008
Abstract While the development of solution‐processed organic light‐emitting diodes (sOLEDs) utilizing multiple resonance‐induced thermally activated delayed fluorescence (MR‐TADF) is highly significant, it restricted by limited solubility and film‐forming property resulting from rigid conjugate planarity MR‐TADF materials. Herein, an effective strategy presented to obtain narrowband emitters introducing inert steric bulky hindrance group into resonance skeleton, thereby mitigating issues...
Abstract B‐ and N‐heterocyclic fluorophores have reveal promising efficiency in blue organic light‐emitting diodes (OLEDs) with small full‐width‐at‐half‐maximum (FWHM). However, their structural determinants for spectral broadening operating stability are still needed to be investigated further. Herein, a novel multi‐N‐heterocycles Diindolo[3,2,1jk:3′,2′,1′jk]dicarbazole[1,2‐b:4,5‐b] (DIDCz) is proposed manipulate the emission color toward pure region by extending π‐conjugation of N‐π‐N...
Abstract Exciplex, characterized by intermolecular charge transfer and thermally activated delayed fluorescence (TADF) properties, plays a significant role in organic light‐emitting diodes (OLEDs), particularly as co‐hosts. The rapid rate of reverse intersystem crossing (RISC) balanced carrier mobility contribute to improved efficiency suppressive roll‐off at high current density. Despite these advantages, the fabrication devices using two‐component exciplexes is challenging, especially when...
We have designed and synthesized a series of 9-anthrylpyrazole derivatives 1,4-bis(3-(9-anthryl)-1-pyrazolylmethyl)benzene (1), 1-(3-(9-anthryl)-1-pyrazolylmethyl)-4-(5-(9-anthryl)-1-pyrazolylmethyl)benzene (2), 1,4-bis(3-(9-anthryl)-1-pyrazolyl)benzene (3), 1-(3-(9-anthryl)-1-pyrazolyl)-4-(5-(9-anthryl)-1-pyrazolyl)benzene (4). All compounds formed two types crystals that exhibited anthracene-arrangement-dependent emission colors. For instance, crystal 1a with strong π-overlap between...
A high-efficiency and pure white OLED has been realized by only doping one novel phosphorescent orange-light-emitting complex (bzq)2Ir(dipba) into a suitable deep-blue-emitting fluorescent Bepp2 as an emissive layer. The highest efficiency for OLEDs with simple HTL-EML-ETL architecture, peak power (PE) of 48.8 lm W−1 external quantum (EQE) 27.8%, employing both singlet triplet excitons emission. PE EQE at the applicable brightness 1000 cd m−2 are 37.5 36.8%, respectively.
With the high energy ball milling method, a Co<sub>9</sub>S<sub>8</sub>-decorated reduced graphene oxide (RGO) composite, which shows excellent hydrogen storage capacity, has been successfully fabricated with well-organized layered structure.
Abstract Free of noble-metal and high in unit internal quantum efficiency electroluminescence, organic molecules with thermally activated delayed fluorescence (TADF) features pose the potential to substitute metal-based phosphorescence materials serve as new-generation emitters for mass production light emitting diodes (OLEDs) display. Predicting function TADF beyond classic chemical synthesis material characterization experiments remains a great challenge. The advances deep learning (DL)...
Four diboron-contained ladder-type pi-conjugated compounds 1-4 were designed and synthesized. Their thermal, photophysical, electrochemical properties, as well density functional theory calculations, fully investigated. The single crystals of 1 3 grown, their crystal structures determined by X-ray diffraction analysis. Both have a framework. Compounds 2 possess high thermal stabilities, moderate solid-state fluorescence quantum yields, stable redox indicating that they are possible...
Highly efficient, low driving-voltage, red phosphorescent OLEDs with a wide range of doping concentrations or even without are successfully fabricated by use an easily available amidinate-ligated iridium complex.
Four diboron-bridged ladder molecules 1–4 have been designed and synthesized. X-ray diffraction analysis revealed that the bulky phenyl substituents on boron centers efficiently prevented π stacking of luminescent unit. Characterizations these complexes demonstrated construction diboron-containing ladder-type skeletons endowed materials with good thermal stability, high fluorescence quantum yields, strong electron affinity. The highly efficient nondoped organic light-emitting diodes using 1...
A facile double-film annealing approach has been developed to prepare fac-Alq3 nano/microstructures (see figure) as well a uniform thin film. More noteworthy is that this not only enables the synthesis of high-quality nanostructures and films but also provides possibility evaluate transporting nature Current–voltage characterization film implies typical p-type semiconductor. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed,...
Precisely controlling well-defined, stable single-molecule junctions represents a pillar of electronics. Early attempts to establish computing with molecular switching arrays were partly challenged by limitations in the direct chemical characterization metal–molecule–metal junctions. While cryogenic scanning probe studies have advanced mechanistic understanding current- and voltage-induced conformational switching, conformations are still largely inferred from indirect evidence. Hence,...
This paper presents the latest progress toward fully embedded board-level optical interconnects in aspect of waveguide fabrication and device integration. A one-step pattern transfer method is used to form a large cross-section multimode array with 45deg micromirrors by silicon hard molding method. Optimized novel spin-coating surface smoothing for master mold, propagation loss reduced 0.09 dB/cm. The coupling efficiency metal-coated reflecting mirror, which thin-film waveguide, simulated an...
A novel green emissive Alq(3) solid with a facial isomeric form has been obtained by grinding the typical blue luminescent fac-Alq(3) crystalline powder. This is first report, to best of our knowledge, that isomer emits light.
Abstract The advent of multi‐resonance thermally activated delayed fluorescence (MR‐TADF) materials, heralding cutting‐edge emitters with superior efficiency and color fidelity, represents a momentous stride in the realm organic light‐emitting diodes (OLEDs). In this particular investigation, substantial advancements have been made by enhancing, synthesizing, characterizing three distinct MR‐type through meticulous control peripheral decorations using frontier molecular orbital engineering....
Vibrational excitations provoked by coupling effects during charge transport through single molecules are intrinsic energy dissipation phenomena, in close analogy to electron–phonon solids. One fundamental challenge molecular electronics is the quantitative determination of charge-vibrational (electron–phonon) for single-molecule junctions. The ability record phenomena at level a key prerequisite fully rationalize and optimize charge-transport efficiencies specific configurations currents....
Complete absorption of electromagnetic waves is paramount in today's applications, ranging from photovoltaics to cross-talk prevention into sensitive devices. In this context, we use a genetic algorithm (GA) strategy optimize properties periodic arrays truncated square-based pyramids made alternating stacks metal/dielectric layers. We target ultra-broadband quasi-perfect normally incident radiations the visible and near-infrared ranges (wavelength comprised between 420 1600 nm). compare...
The narrowband emission of multi-resonance thermally activated delayed fluorescence (MR-TADF) molecules is associated with the surrounding group dominated vibronic transitions.
An array of 50μm×50μm polymer waveguides with 45° total internal reflection (TIR) wideband coupling mirrors were fabricated by soft molding to achieve fully embedded boardlevel optoelectronic interconnects. The TIR formed at the ends provide surface normal light between and devices. Three-dimensional interconnects replicated in one-step transfer technique. measured propagation loss multimode waveguide was 0.16dB∕cm 850nm wavelength. efficiency silver-coated micromirrors buried under top...