A5087951236- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Luminescence and Fluorescent Materials
- Conducting polymers and applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Perovskite Materials and Applications
- Molecular Junctions and Nanostructures
- Thin-Film Transistor Technologies
- Lanthanide and Transition Metal Complexes
- Quantum Dots Synthesis And Properties
- Advanced Memory and Neural Computing
- Green IT and Sustainability
- Photochemistry and Electron Transfer Studies
- Crystallography and molecular interactions
- Catalytic Cross-Coupling Reactions
- Semiconductor Lasers and Optical Devices
- Semiconductor materials and devices
- Photonic Crystals and Applications
- Nanomaterials and Printing Technologies
- Graphene research and applications
- Magnetism in coordination complexes
- Molecular Sensors and Ion Detection
- Nanofabrication and Lithography Techniques
- Analytical Chemistry and Sensors
South China University of Technology
2016-2025
State Key Laboratory of Luminescent Materials and Devices
2017-2025
Southwest Forestry University
2025
Shenzhen Institute of Information Technology
2024
Beijing Technology and Business University
2021-2023
Key Laboratory of Guangdong Province
2019-2021
Hong Kong University of Science and Technology
2018-2021
University of Hong Kong
2005-2021
State Council of the People's Republic of China
2015-2021
Chinese Academy of Sciences
2011-2020
Abstract In an organic electroluminescent (EL) device, the recombination of injected holes and electrons produces what appears to be ion‐pair or charge‐transfer (CT) exciton, this CT exciton decays produce one photon directly, relaxes a low‐lying local (LE). Thus full utilization both energy LE should pathway for obtaining high‐efficiency EL. Here, twisting donor‐acceptor (D‐A) triphenylamine‐imidazol molecule, TPA‐PPI, is reported: its synthesis, photophysics, EL performance. Prepared by...
In principle, the ratio (Φ) of maximum quantum efficiencies for electroluminescence (EL) to photoluminescence (PL) can be expected approach unity, if exciton (bound electron–hole pair) generated from recombination injected electrons and holes in OLEDs has a sufficiently weak binding energy. However, seldom are examples Φ > 25% reported because strongly bound excitons most organic semiconductors nature. Here, twisting donor–acceptor triphenylamine‐thiadiazol molecule (TPA‐NZP) exhibits...
We demonstrate the first white light-emitting device originating from single carbon dot components. A maximum external quantum efficiency of 0.083% at a current density 5 mA cm(-2) with color-rendering index 82 is realized, indicating that dots have great potential to be an alternative phosphor for fabricating light electroluminescent devices.
The excellent electroluminescent (EL) properties of 1,1-disubstituted 2,3,4,5-tetraphenylsiloles, 1-methyl-1,2,3,4,5-pentaphenylsilole (MPPS), and 1,1,2,3,4,5-hexaphenylsilole (HPS) have been found. Despite some studies devoted to these materials, very little is known about the real origin their unique EL properties. Therefore, we investigated structures, photoluminescence (PL), charge carrier transport 2,3,4,5-tetraphenylsiloles as well effect substituents on characteristics. single...
An enhanced performance: Electroluminescent devices incorporating a simple carbazole/oxadiazole hybrid as host for dopants show maximum external quantum efficiencies (ηEQE) high 20.2 % green and 18.5 deep red electrophosphorescence (see picture, J=current density). The can be conveniently prepared has good thermal morphological stabilities triplet energy level. Supporting information this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z803396_s.pdf or...
Abstract Photodetectors that convert a light signal into an electrical have wide applications in detection. As emerging candidate for next‐generation sensing, organic photodetectors compensate well the shortages of traditional inorganic terms ease processing, compatibility with flexible substrates, tunable absorption characteristics, low‐cost manufacturing, and being lightweight. Currently, regular improvements are made respect to their important figure‐of‐merit performances, which caught up...
Abstract By incorporating two phosphorescent dyes, namely, iridium(III)[bis(4,6‐difluorophenyl)‐pyridinato‐N,C 2 ′]picolinate (FIrpic) for blue emission and bis(2‐(9,9‐diethyl‐9 H ‐fluoren‐2‐yl)‐1‐phenyl‐1 ‐benzoimidazol‐N,C 3 )iridium(acetylacetonate) ((fbi) Ir(acac)) orange emission, into a single‐energy well‐like emissive layer, an extremely high‐efficiency white organic light‐emitting diode (WOLED) with excellent color stability is demonstrated. This device can achieve peak...
A series of D-π-A-π-D type near-infrared (NIR) fluorescent compounds based on benzobis(thiadiazole) and its selenium analogues were synthesized fully characterized by 1H 13C NMR, high-resolution mass spectrometry, elemental analysis. The absorption, fluorescence, electrochemical properties also studied. Photoluminescence these chromophores ranges from 900 to 1600 nm their band gaps are between 1.19 0.56 eV. Replacing the sulfur can lead a red shift for emission reduce further. Interestingly,...
Mononuclear Cu I complexes with mixed ligands are used to fabricate green phosphorescent organic light‐emitting diodes. The electroluminescence (EL) maximum at 524 nm coincides well its photoluminescent (PL) spectrum in poly(methyl methacrylate) film (see Figure). A current efficiency of 10.5 cd –1 105 m –2 and a brightness up 1663 demonstrated.
Purely organic electroluminescent materials, such as thermally activated delayed fluorescent (TADF) and triplet-triplet annihilation (TTA) basically harness triplet excitons from the lowest excited state (T1 ) to realize high efficiency. Here, a material that can convert into singlet high-lying (T2 ), referred here "hot exciton" path, is reported. The energy levels of this compound are determined sensitization nanosecond transient absorption spectroscopy measurements, i.e., small splitting...
Abstract Development of highly efficient circularly polarized organic light‐emitting diodes (CPOLEDs) has gained increasing interest as they show improved luminous efficiency and high contract 3D images in OLED displays. In this work, a series binaphthalene‐containing luminogenic enantiomers with aggregation‐induced emission (AIE) delayed fluorescence properties is designed synthesized. These molecules can emit from green to red light depending on the solvent polarity due twisted...
Through adding two substituent phenyl groups on distyrylbenzene, we have obtained the cross stacking of 2,5-diphenyl-1,4-distyrylbenzene with trans double bonds (trans-DPDSB) in crystalline state. In such a cross-stacking mode, solid-state emission exhibits high-intensity, having characteristics similar to its single molecule. The organic light-emiiting diodes (OLEDs) attractive performance been achieved using trans-DPDSB as light-emitting layer, and amplified spontaneous needlelike crystals...
A series of NIR organic chromophores with donor–π–acceptor–π–donor structure are synthesized. Good thermal stability and strong photoluminescence in solid state render them suitable for application light-emitting diodes. Exclusive near-infrared emission at 1080 nm external quantum efficiency 0.28% is obtained from the nondoped OLEDs. The longest electroluminescence wavelength 1220 nm.
Abstract Four 4,4′‐bis(1,2,2‐triphenylvinyl)biphenyl (BTPE) derivatives, 4,4′‐bis(1,2,2‐triphenylvinyl)biphenyl, 2,3′‐bis(1,2,2‐triphenylvinyl)biphenyl, 2,4′‐bis(1,2,2‐triphenylvinyl)biphenyl, 3,3′‐bis(1,2,2‐triphenylvinyl)biphenyl and 3,4′‐bis(1,2,2‐triphenylvinyl)biphenyl ( o TPE‐ m TPE, p respectively), are successfully synthesized their thermal, optical, electronic properties fully investigated. By merging two simple tetraphenylethene (TPE) units together through different linking...
Metal halide perovskites have received much attention for their application in light-emitting diodes (LEDs) the past several years. Rapid progress has been made efficient green, red, and near-infrared perovskite LEDs. However, development of blue LEDs is still lagging far behind. Here, we report sky-blue by rearranging low-dimensional phase distribution quasi-2D perovskites. We incorporated sodium ions into mixed-Cl/Br with phenylethylammonium as organic spacer cesium lead inorganic...
By using mixed hosts with bipolar transport properties for blue emissive layers, a novel phosphorescence/fluorescence hybrid white OLED without an interlayer between the fluorescent and phosphorescent regions is demonstrated. The peak EQE of device 19.0% remains as high 17.0% at practical brightness 1000 cd m−2.
A family of donor–acceptor–donor (D–A–D) type near-infrared (NIR) fluorophores containing rigid nonplanar conjugated tetraphenylethene (TPE) moieties was designed and synthesized through Stille coupling reactions with electron-deficient [1,2,5]thiadiazolo[3,4-g]quinoxaline (QTD) or benzo[1,2-c;4,5-c′]bis[1,2,5]thiadiazole (BBTD) as acceptors. The absorption, fluorescence, electrochemical properties were studied. These compounds exhibited good aggregation-induced emission enhancement (AIEE)...
Fluorescent emitters have regained intensive attention in organic light emitting diode (OLED) community owing to the breakthrough of device efficiency and/or new mechanism. This provides a good chance develop near‐infrared (NIR) fluorescent emitter and high‐efficiency device. In this work, D‐π‐A‐π‐D type compound with naphthothiadiazole as acceptor, namely, 4,4′‐(naphtho[2,3‐c][1,2,5]thiadiazole‐4,9‐diyl)bis( N,N ‐diphenylaniline) (NZ2TPA), is designed synthesized. The photophysical study...
This review summarizes recent advances in blue OLEDs based on fluorescence emitters, especially focusing the different mechanisms involving emitters and devices.
Tailor-made red thermally activated delayed fluorescence (TADF) molecules comprised of an electron-withdrawing pyrazino[2,3-f][1,10]phenanthroline-2,3-dicarbonitrile core and various electron-donating triarylamines are developed. They can form intramolecular hydrogen-bonding, which is conducive to improving emission efficiency promoting horizontal orientation show near infrared (NIR) emissions (692-710 nm) in neat films (606-630 with high photoluminescence quantum yields (73-90%) doped...
Abstract This roadmap includes the perspectives and visions of leading researchers in key areas flexible printable electronics. The covered topics are broadly organized by device technologies (sections 1–9), fabrication techniques 10–12), design modeling approaches 13 14) essential to future development new applications leveraging electronics (FE). interdisciplinary nature this field involves everything from fundamental scientific discoveries engineering challenges; synthesis materials via...
Abstract Actualizing full singlet exciton yield via a reverse intersystem crossing from the high‐lying triplet state to state, namely, “hot exciton” mechanism, holds great potential for high‐performance fluorescent organic light‐emitting diodes (OLEDs). However, incorporating comprehensive insights into mechanism and effective molecular design strategies still remains challenging. Herein, three blue emitters (CNNPI, 2TriPE‐CNNPI, 2CzPh‐CNNPI) with distinct local excited (LE) charge‐transfer...
Abstract Herein, we report a deep‐red TADF emitter p CNQ–TPA , composed of quinoxaline‐5,8‐dicarbonitrile ( CNQ) acceptor and triphenylamine (TPA) donor. supported its OLED with desired CIE coordinates (0.69, 0.31) the record maximum external quantum efficiency 30.3 %, which is best red diode Rec.2020 gamut for UHDTV. It showed that through tuning doping concentration, intra‐ inter‐molecular charge transfer are balanced to synchronously improve emission color saturation radiation, remedy...
Multi-resonance boron-nitrogen-containing thermally activated delayed fluorescence (MR-TADF) emitters have experienced great success in assembling narrowband organic light-emitting diodes (OLEDs). However, the slow reverse intersystem crossing rate (kRISC ) of MR-emitters (103 -105 s-1 that will lead to severe device efficiency roll-off has received extensive attention and remains a challenging issue. Herein, we put forward "space-confined donor-acceptor (SCDA)" strategy accelerate RISC...