A5017774112- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Luminescence and Fluorescent Materials
- Conducting polymers and applications
- Green IT and Sustainability
- GaN-based semiconductor devices and materials
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- Molecular Sensors and Ion Detection
- 2D Materials and Applications
- Solid-state spectroscopy and crystallography
- Semiconductor materials and interfaces
- Photochromic and Fluorescence Chemistry
- Radio Frequency Integrated Circuit Design
- Thin-Film Transistor Technologies
- Color Science and Applications
- Image and Video Quality Assessment
- Molecular Junctions and Nanostructures
- Ga2O3 and related materials
- Catalytic Alkyne Reactions
- Thermal Radiation and Cooling Technologies
Solid State Physics Laboratory
2014-2024
ETH Zurich
2016-2024
Institute for Biomedical Engineering
2016-2023
Bioengineering (Switzerland)
2015-2023
Charles Humbert 8
2019-2021
École Polytechnique Fédérale de Lausanne
2018-2019
National Tsing Hua University
2011-2018
Metal-halide perovskites have rapidly emerged as one of the most promising materials 21st century, with many exciting properties and great potential for a broad range applications, from photovoltaics to optoelectronics photocatalysis. The ease which metal-halide can be synthesized in form brightly luminescent colloidal nanocrystals, well their tunable intriguing optical electronic properties, has attracted researchers different disciplines science technology. In last few years, there been...
Colloidal lead halide perovskite nanocrystals (NCs) have recently emerged as versatile photonic sources. Their processing and optoelectronic applications are hampered by the loss of colloidal stability structural integrity due to facile desorption surface capping molecules during isolation purification. To address this issue, herein, we propose a new ligand strategy utilizing common inexpensive long-chain zwitterionic such 3-(N,N-dimethyloctadecylammonio)propanesulfonate, resulting in much...
Highly efficient OLEDs are extremely demanded for the design of highly competitive energy-saving displays and lightings. In this article, we have systematically reviewed some most effective organic materials, eleven device architectural approaches, outcoupling techniques to realize high efficiency OLEDs.
Colloidal nanocrystals (NCs) of APbX3-type lead halide perovskites [A = Cs+, CH3NH3+ (methylammonium or MA+) CH(NH2)2+ (formamidinium FA+); X Cl-, Br-, I-] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., display backlighting) to light-emitting diodes. From the perspective spectral coverage, a formidable challenge facing use these materials is how obtain stable emissions in red and infrared regions...
Solution-processed hybrid organic-inorganic lead halide perovskites are emerging as one of the most promising candidates for low-cost light-emitting diodes (LEDs). However, due to a small exciton binding energy, it is not yet possible achieve an efficient electroluminescence within blue wavelength region at room temperature, necessary full-spectrum light sources. Here, we demonstrate LEDs based on colloidal, quantum-confined 2D perovskites, with precisely controlled stacking down...
Pure green light-emitting diodes (LEDs) are essential for realizing an ultrawide color gamut in next-generation displays, as is defined by the recommendation (Rec.) 2020 standard. However, because human eye more sensitive to spectral region, it not yet possible achieve ultrapure electroluminescence (EL) with a sufficiently narrow bandwidth that covers >95% of Rec. standard CIE 1931 space. Here, we demonstrate efficient, EL based on colloidal two-dimensional (2D) formamidinium lead bromide...
Hybrid organic-inorganic and fully inorganic lead halide perovskite nanocrystals (NCs) have recently emerged as versatile solution-processable light-emitting light-harvesting optoelectronic materials. A particularly difficult challenge lies in warranting the practical utility of such semiconductor NCs red infrared spectral regions. In this context, all three archetypal A-site monocationic perovskites-CH3NH3PbI3, CH(NH2)2PbI3, CsPbI3-suffer from either chemical or thermodynamic instabilities...
Quantum dot (QD) light-emitting diodes (LEDs) are emerging as one of the most promising candidates for next-generation displays. However, their intrinsic light outcoupling efficiency remains considerably lower than organic counterpart, because it is not yet possible to control transition-dipole-moment (TDM) orientation in QD solids at device level. Here, using colloidal lead halide perovskite anisotropic nanocrystals (ANCs) a model system, we report directed self-assembly approach form...
The first low-dimensional semiconductor nanocrystal system that increases the photoluminescence quantum yield in aggregates.
Solution-processed layered-controlled 2D metal halide perovskites are emerging as one of the most promising candidates for low-cost photovoltaics and optoelectronics.
A series of thienylphenothiazine decorated carbazoles were synthesized and characterized by optical, electrochemical, thermal, theoretical investigations. Absorption spectra the compounds are influenced substitution pattern chromophore number density. Compounds containing 2,7-substitution exhibited red-shifted absorption, while loading on other positions led to increment in molar extinction coefficients due increase Multiple substitutions resulted twisting chromophores affected conjugative...
This article describes the synthesis and characteristics of a cyanofluorene–acetylene conjugate based blue emitter C3FLA-2. In host doped device, C3FLA-2 shows an EQE 8.0% CIE<sub>xy</sub>of (0.156, 0.048).
There has been a tremendous amount of interest in developing high-efficiency light-emitting diodes (LEDs) based on colloidal nanocrystals (NCs) hybrid lead halide perovskites. Here, we systematically investigate the ligand effects EL characteristics by tuning hydrophobicity primary alkylamine ligands used NC synthesis. By increasing hydrophobicity, find (i) reduced size that induces higher degree quantum confinement, (ii) shortened exciton lifetime increases photoluminescence yield, (iii)...
Tuning emission color of molecular fluorophores is fundamental interest as it directly reflects the manipulation excited states at quantum mechanical level. Despite recent progress in design and engineering on single fluorophores, a systematic methodology to obtain multicolor aggregated or solid states, which gives rise practical implications, remains scarce. In this study, we present general strategy continuously tune single-fluorophore aggregate by polymerization-mediated through-space...
Gold(III) complexes are emerging as promising phosphorescent emitters for high-efficiency organic light-emitting diodes (OLEDs). However, despite recent advances in the coordination and organometallic chemistry of gold, only few compounds have been successful high-performance devices. Here, we disclose synthesis a new κ3-(N^C^C)-aminophenylalkynyl-N,N′-bisfluorenyl-Au(III) complex which exhibits current efficiency (ηCE) 56.4 cd A–1 an external quantum (ηext) 16.2% solution processable OLED...
Solution-processable molecular hole transporting materials (HTMs) are crucial to realize inexpensive fabrication of energy-efficient and large area organic light emitting diodes (OLEDs) for next-generation displays lighting.
A wet- and dry-process feasible host material is crucial to realize, respectively, low cost roll-to-roll fabrication of large area high performance organic light-emitting diodes (OLEDs) with precise deposition layers.
We report a high-efficiency blue organic light-emitting diode (OLED) with solution-processed emissive layer composed of an oligomeric host poly[3-(carbazol-9-ylmethyl)-3-methyloxetane] (PCMO) that possesses high triplet-energy and electron mobility. The device exhibited current efficiency 40.4 cd A−1 external quantum (EQE) 21.6% power 28.2 lm W−1 at 230 m−2 or 24.7 A−1, 10.3%, 15.5 1 000 m−2. may be attributed to the possessing mobility lower injection barrier, resulting in more balanced...
In this article, the impact of gamma (<inline-formula> <tex-math notation="LaTeX">$\gamma $ </tex-math></inline-formula>) irradiation on passivated and unpassivated AlGaN/GaN HEMT is presented in detail. Passivated GaN-HEMT devices have been exposed to <inline-formula> </tex-math></inline-formula>-radiations a total dose 10 kGy. Post-<inline-formula> </tex-math></inline-formula>-irradiation, refinement ohmic contact, which makes device source/drain, recorded. Alteration Schottky gate...
Pyrene–benzimidazole hybrids have been demonstrated as deep blue emitters for organic light-emitting diodes.
Colloidal perovskite nanocrystals are emerging as one of the most promising candidates for next-generation monochromatic light sources that require precise bandgap tunability. However, current efficiency (ηCE) and operational lifetime in their light-emitting diodes (LEDs) remain low due to impeded carrier transport exciton quenching through NC ligand layer. Here, we show fundamental limitation can be overcome superstructures containing polydisperse colloidal quantum wells organic–inorganic...