The invention relates to an aqueous colorant preparation for coloring thermoplastic plastics.

A composition and a wavelength converter are provided. The composition includes at least: quantum dots having an emission peak wavelength in a visible light region; and quantum dots having an emission peak wavelength in an ultraviolet region or in a near-ultraviolet region. The wavelength converter includes, in a polymer: quantum dots having an emission peak wavelength in a visible light region; quantum dots having an emission peak wavelength in an ultraviolet region or in a near-ultraviolet region; and an oxide formed by oxidizing at least a part of the quantum dots having an emission peak wavelength in an ultraviolet region or in a near-ultraviolet region.

Nanoscale stress-sensing can be used across fields ranging from detection of incipient cracks in structural mechanics to monitoring forces in biological tissues. We demonstrate how tetrapod quantum dots (tQDs) embedded in block-copolymers act as sensors of tensile/compressive stress. Remarkably, tQDs can detect their own composite dispersion and mechanical properties, with a switch in optomechanical response when tQDs are in direct contact. Using experimental characterizations, atomistic simulations and finite-element analyses, we show that under tensile stress, densely-packed tQDs exhibit a photoluminescence peak shifted to higher energies (blue-shift) due to volumetric compressive stress in their core; loosely-packed tQDs exhibit a peak shifted to lower energies (red-shift) from tensile stress in the core. The stress-shifts result from the tQD's unique branched morphology in which the CdS arms act as antennas that amplify the stress in the CdSe core. Our nanocomposites exhibit excellent cyclability and scalability with no degraded properties of the host polymer. Colloidal tQDs allow sensing in many materials to potentially enable auto-responsive, smart structural nanocomposites that self-predict impending fracture.

The present invention discloses a color photoresist and its use, a color film substrate, a display panel and a liquid crystal display, which pertains to the field of photosensitive materials. The color photoresist comprises a photoinitiator and QDs. The photoinitiator is a first photoinitiator containing no electron-rich group or a second photoinitiator containing an electron-rich group. The second photoinitiator comprises a conjugation structure, and the conjugation structure consists of the electron-rich group and an adjacent group of the electron-rich group. The color photoresist provided in embodiments of the present invention contains QDs which emit light normally. The color film substrate prepared by using the color photoresist has a high color gamut and can effectively improve the picture quality of the liquid crystal display.

A dual-modal information storage and anti-counterfeiting material, and its preparation method are provided. The dual-modal information storage and anti-counterfeiting material uses cadmium sulfide quantum dots (CdS QDs) as information storage material, and uses the controllable photocorrosion of CdS QDs to achieve dual-modal optical information storage and anti-counterfeiting applications. Firstly, the type of ligands and modification degree of CdS QDs are precisely controlled during the aqueous phase synthesise process, so as to effectively control the photocorrosion phenomenon under UV light irradiation. Subsequently, the CdS QDs are loaded in the hydrogel network, and they are also loaded on the substrates such as cloth and paper by spray coating, dip coating or 3D printing, and the information is stored by digital light patterning. Different from the photochromic function of traditional anti-counterfeiting material, the CdS QDs shows dual-modal patterning characteristics in a wide wavelength range.