A light emitting device includes a light emitting element adapted to emit blue light, quantum dots that absorb part of the blue light emitted from the light emitting element to emit green light, and at least one of a KSF phosphor adapted to absorb part of the blue light emitted from the light emitting element to emit red light and a MGF phosphor adapted to absorb part of the blue light emitted from the light emitting element to emit red light.

A nanocrystal composition can include a nanocrystal and an outer layer including a ligand bound to the nanocrystal, wherein the ligand includes a norbornene group and a carboxyl group.

A light emitting device includes a light emitting element adapted to emit blue light, quantum dots that absorb part of the blue light emitted from the light emitting element to emit green light, and at least one of a KSF phosphor adapted to absorb part of the blue light emitted from the light emitting element to emit red light and a MGF phosphor adapted to absorb part of the blue light emitted from the light emitting element to emit red light.

The present disclosure discloses a quantum-dot display substrate, a method for preparing the same, and a display panel. The quantum-dot display substrate includes a substrate and a plurality of light emitting sub-pixels disposed on the substrate, in which each of the light emitting sub-pixels includes a quantum-dot light emitting layer, and the quantum-dot light emitting layer includes a crosslinked network formed by crosslinking quantum dots having a crosslinkable ligand with a crosslinking agent.

The present invention provides photoluminescent iron-doped barium stannate materials absorbing ultraviolet (UV) light and exhibiting strong near-infrared (NIR) luminescence. Such materials exhibit increased integrated photoluminescence intensity in comparison to known BaSnO.sub.3 and iron-doped barium stannate materials, and therefore they are particularly useful for the production of photoluminescent security ink compositions and transparent covert security features with improved anti-counterfeiting resistance that can be used for protection of documents and articles against counterfeit and illegal reproduction.

Security of a printed matter is enhanced, and a visual image is made to clear if a latent image formed by a coat printed on a matter to be printed for a security enhancement of the printed matter becomes the visual image. A security ink pigment contains a powder. A main constituent of the powder is a perovskite-type oxide. The perovskite-type oxide has a composition expressed as a general formula of ABO.sub.3. A is mainly made of Ba. B is mainly made of Sn. The powder emits infrared fluorescence when being irradiated with ultraviolet excitation light. The perovskite-type oxide has a crystal lattice constant having a difference equal to or smaller than 0.002 angstrom from a theoretical crystal lattice constant of the perovskite-type oxide having a composition expressed as a composition formula of BaSnO.sub.3.

Security of a printed matter is enhanced, a coat printed on a matter to be printed for a security enhancement of the printed matter is printed by a normal printing process, and the coat is flattened and smoothed. A security ink pigment contains a powder. A main constituent of the powder is a perovskite-type oxide. The perovskite-type oxide has a composition expressed as a general formula of ABO.sub.3. A is mainly made of Ba. B is mainly made of Sn. A median diameter of the powder is equal to or smaller than 10 m. The powder emits infrared fluorescence when being irradiated with ultraviolet excitation light.

A fluorescent material includes at least one fluorescent compound having a structure formula of ABX.sub.ZY.sub.3-Z as defined in the specification, a plurality of NH.sub.3.sup.+ group-containing ions bound to the fluorescent compound through protonation of amine groups of an amine composition, and a plurality of COO.sup. group-containing ions bound to the fluorescent compound through deprotonation of carboxyl groups of an acid composition. The amine composition has a total hydrogen bonding Hansen solubility parameter (T.sub.H) ranges from 2.4 to 3.3 (cal/cm.sup.3).sup.1/2, and the acid composition has a total polar Hansen solubility parameter (T.sub.P) which is less than 1.4 (cal/cm.sup.3).sup.1/2.

A luminescent substance particle including BaSnO.sub.3 having a perovskite-type structure, wherein the luminescent substance particle contains one of 0.07% by mass or less of Fe (iron), 0.005% by mass or less of Cr (chromium) and 0.02% by mass or less of Ni (nickel). A wavelength conversion film including the luminescent substance particle for converting a light in an ultraviolet region to a light in an infrared region. A wavelength conversion device including a substrate and the wavelength conversion film formed on the substrate.

A vehicle applique is provided that includes a substantially transparent substrate defining first and second surfaces, a decorative film positioned on the first surface of the substrate, and an over-mold positioned over the film. The over-mold defines at least one diffraction grating and a light source is positioned proximate the second surface of the substrate. The light source is configured to emit light through the substrate and the over-mold.