A5058896850- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Optical properties and cooling technologies in crystalline materials
- Nanoplatforms for cancer theranostics
- Perovskite Materials and Applications
- Photoacoustic and Ultrasonic Imaging
- Luminescence and Fluorescent Materials
- ZnO doping and properties
- Luminescence Properties of Advanced Materials
- Nonlinear Optical Materials Studies
- Advanced Photocatalysis Techniques
- Spectroscopy and Laser Applications
Zhejiang University
2020-2025
Abstract Phonon-assisted up-conversion photoluminescence can boost energy of an emission photon to be higher than that the excitation by absorbing vibration (or phonons) emitter. Here, power-conversion efficiency (power ratio between and photons) for CdSe/CdS core/shell quantum dots is observed beyond unity. Instead commonly known defect-assisted colloidal dots, temperature-dependent measurements single-dot spectroscopy reveal conventional down-conversion share same electron-phonon coupled...
Using CdSe/ZnSe core-shell quantum dots (QDs) as a model, we systematically investigate the photochemical properties of QDs with ZnSe shells under an ambient environment, which show almost opposite responses to either oxygen or water in comparison CdSe/CdS core/shell QDs. While provide efficient potential barrier for photoinduced electron transfer from core surface-adsorbed oxygen, they also act stepping stone hot-electron directly oxygen. The latter process is so effective and competes...
Localization of exciton wavefunctions away from the inorganic–organic interface is proposed for synthesizing colloidal spheroidal quantum dots (QDs) with an ultranarrow photoluminescence (PL) peak width. This strategy demonstrated by uniform-alloy CdxZn1–xSe and CdxZn1–xSe/ZnSe/ZnS core/shell QDs. For blue-emitting QDs, ensemble PL full width at half-maximum (fwhm) reaches 10.2 nm corresponding single-dot fwhm 5.2 nm. The values green-emitting QDs are 16.3 9.7 nm, respectively. These...
Abstract Bright anti-Stokes fluorescence (ASF) in the first near-infrared spectral region (NIR-I, 800 nm–900 nm) under excitation of a 915 nm continuous wave (CW) laser, is observed Indocyanine Green (ICG), dye approved by Food and Drug Administration for clinical use. The dependence intensity on light power temperature, together with lifetime measurement, establish this ASF to be originated from absorption thermally excited vibrational level (hot-band absorption), as shown our experiments,...
Abstract Quantum-dot optoelectronics, pivotal for lighting, lasing and photovoltaics, rely on nanocrystalline oxide electron-injection layer. Here, we discover that the prevalent surface magnesium-modified zinc layer possesses poor n-type attributes, leading to suboptimal encapsulation-resin-sensitive performance of quantum-dot light-emitting diodes. A heavily n-doped layer—exhibiting ohmic transport with 1000 times higher electron conductivity improved hole blockage—is developed via a...
Hot-band absorption (HBA)-induced anti-Stokes fluorescence (ASF) with longer-wavelength excitation is one effective pathway to deep penetration and low autofluorescence in intravital imaging, raising demands for fluorophores broad spectra, high absorption, strong emission. However, typical fluorescent dyes display some emission quenching when their concentration increased order obtain brighter fluorescence. In this work, the HBA-induced ASF of aggregation-induced (AIE) dots reported....
ConspectusThe invention of single-crystalline semiconductors and related devices allows us to manipulate electrons (or holes) as free charge carriers with ease. Photons are two types fundamental particles for electromagnetic interaction, optical/optoelectronic thus likely important semiconductor electronic devices. themselves have negligible direct interactions each other, manipulating photons─controlling their color purity accuracy, phase coherency polarity, conversion from/to other forms...
Abstract Anti-Stokes fluorescence was observed in ICG, a molecule approved by the FDA for clinical use. The wavelengths of its are mainly located near-infrared band 800 nm~900 nm, with high quantum yield up to 8%. In order know generation mechanism, based on multi-photon absorption (MPA) theory, thermally activated delayed (TADF) theory and hot power dependence, temperature dependence spectra spectra, lifetime were measured. Its mechanism finally determined be process. Since ICG showed...