A color conversion film is provided. The film includes at least one narrow band emission phosphor dispersed within a binder matrix, wherein the narrow band emission phosphor has a D50 particle size from about 0.1 μm to about 15 μm and is selected from the group consisting of a green-emitting U.sup.6+-containing phosphor, a green-emitting Mn.sup.2+-containing phosphor, a red-emitting phosphor based on complex fluoride materials activated by Mn.sup.4+, and a mixture thereof. A device is also provided.

A light-emitting diode (LED) and a backlight-type display device are provided. The light-emitting diode includes: a multi-color light emitting chip, an emission spectrum thereof including a first peak in a wavelength range of a first primary-color light and a second peak in a wavelength range of a second primary-color light, and an absolute value of a wavelength difference between the first and second peaks being greater than 50 nm; and a phosphor-containing layer, disposed over the multi-color light emitting chip and used to be excited to emit a third primary-color light. Owing to the LED adopts the multi-color light emitting chip which has the first and second peaks in different wavelength ranges and the absolute valve of the wavelength difference is greater than 50 nm, RGB three-primary-color lights can be outputted by adopting a single-color light phosphor powder with relatively high reliability. The backlight-type display device can obtain a high NTSC level.

An optical member includes a first light guide member having an elongated shape and comprising an end surface and a lateral surface extending in a longitudinal direction from the end surface; and a wavelength conversion layer disposed on the lateral surface of the first light guide member and containing a phosphor.

Provided is a method for producing an inorganic fluoride luminescent material having excellent light emission characteristics by using a non-aqueous hydrogen fluoride-containing liquid.

The method for producing an inorganic fluoride luminescent material includes: bringing a first inorganic fluoride luminescent material and a non-aqueous hydrogen fluoride-containing liquid having a hydrogen fluoride content in a range of 20% by mass or more and 100% by mass or less into contact with each other to obtain a non-aqueous solution containing ions derived from the first inorganic fluoride luminescent material, and bringing the non-aqueous solution and a non-aqueous organic liquid having a hydrogen fluoride content of less than 20% by mass into contact with each other to precipitate a second inorganic fluoride luminescent material.

A display including a red subpixel, a green subpixel, a blue subpixel and a fourth subpixel including a teal subpixel or a saturated green pixel and an LED light source. Liquid crystal display devices including U.sup.6+-containing phosphors are also provided. Applications for the display include televisions, mobile phones and computer monitors.

A light emitting diode package includes: a housing; a light emitting diode chip arranged in the housing; a wavelength conversion unit arranged on the light emitting diode chip; a first fluorescent substance distributed inside the wavelength conversion unit and emitting light having a peak wavelength in the cyan wavelength band; and a second fluorescent substance distributed inside the wavelength conversion unit and emitting light having a peak wavelength in the red wavelength band, wherein the peak wavelength of light emitted from the light emitting diode chip is located within a range of 415 nm to 430 nm.

A fluoride phosphor, comprising fluoride particles having an average particle size of 0.1 μm to 7 μm and a maximum particle size of 1 μm to 18 μm, wherein a ratio of the maximum particle size with respect to the average particle size is higher than 1. The fluoride particles have a composition containing an element M containing at least one selected from the group consisting of Group 4 elements, Group 13 elements, and Group 14 elements; an alkali metal; Mn; and F. In the composition, when the number of moles of the alkali metal is 2, the number of moles of Mn is more than 0 but less than 0.2, the number of moles of the element M is more than 0.8 but less than 1, and the number of moles of F is more than 5 but less than 7.

A wavelength conversion member including a wavelength conversion layer containing a fluoride phosphor, quantum dots, a surfactant, and a resin. The fluoride phosphor contains fluoride particles having a specific composition and having particle size values within specific ranges. The quantum dots include at least one selected from a first crystalline nanoparticle and a second crystalline nanoparticle. The first crystalline nanoparticle has a specific composition. When irradiated with light having a wavelength of 450 nm, the first crystalline nanoparticle emits light having an emission peak at a wavelength in a range from 510 nm to 535 nm, and a full width at half maximum of the emission peak of the first crystalline nanoparticle is in a range from 10 nm to 30 nm. The second crystalline nanoparticle includes a chalcopyrite-type crystalline structure, and a full width at half maximum of the emission peak of the second crystalline nanoparticle is 45 nm or less.

A sol-gel process for synthesizing a luminescent material has a general formulation: AxByFz:Mn. A is an element of group 1, 2, 4, NR.sub.4 or a combination of elements belonging to those groups, with R═H or an alkyl chain or a combination of chains. B is an element of group 5, 6, 13, 14 and 0<x≤5, 0<y≤2, 5≤z≤7. The sol-gel process includes a) producing a liquid precursor (2, 3) in an alcohol solution by mixing metal reagents (1) with manganese, the mixture being made at pH<8; b) obtaining a solid precursor (5, 6) from the liquid precursor (2, 3) obtained in step a), by eliminating (4) the solvent; c) crystallizing (7, 70) the solid precursor (5, 6) obtained in step b) by thermal treatment in fluorinated atmosphere; and d) retrieving the fluorescent crystalline powder (8) obtained at an end of step c).

A light emitting diode package including: a housing; a light emitting diode chip arranged in the housing; a wavelength conversion unit arranged on the light emitting diode chip; a first fluorescent substance distributed inside the wavelength conversion unit and emitting light having a peak wavelength in the cyan wavelength band; and a second fluorescent substance distributed inside the wavelength conversion unit and emitting light having a peak wavelength in the red wavelength band, wherein the peak wavelength of light emitted from the light emitting diode chip is located within a range of 415 nm to 430 nm.