A light emitting device is provided. The light emitting device includes a light emitting element, which emits blue light, and a light transmissive member having a first principal face bonded to the light emitting element and a second principal face opposite the first principal face. The light transmissive member has a light transmissive base material and wavelength conversion substances, which are contained in the base material and which absorb the light from the light emitting element and emit light. The wavelength conversion substances are localized in the base material towards the first principal face, and include a first phosphor which emits green to yellow light and a second phosphor which emits red light. The first phosphor is more localized towards the first principal face than the second phosphor. The second phosphor is a manganese-activated fluoride phosphor.

A quantum dot includes a core-shell structure including a core including a first semiconductor nanocrystal and a shell disposed on the core, and including a material at least two different halogens, and the quantum dot does not include cadmium.

The present invention relates to a quantum dot light emitting device, a light emitting device package, and a backlight unit including a quantum dot nanostructure composed of I-VII compounds. The quantum dot light emitting device included first and second electrodes, a light emitting layer including the quantum dot nanostructure, a hole injection layer, a hole transport layer, an electron injection layer and an electron transport layer. The light emitting device package includes a housing, a light emitting device and a light converter, and the light emitting device is disposed in the housing. The light converter is disposed on the light emitting device, and the quantum dot nanostructure may be dispersed therein. The backlight unit includes a light source having the quantum dot light emitting device or the light emitting device package, and a light guide plate uniformly dispersing the direction of light emitted from the light source.

A quantum dot includes a core-shell structure including a core including a first semiconductor nanocrystal and a shell disposed on the core, and including a material at least two different halogens, and the quantum dot does not include cadmium.

The present invention addresses providing a novel narrowband red phosphor having a high internal quantum efficiency, a short afterglow time, and a large number of emission components in a short-wavelength region with high red visibility. This is solved by a phosphor characterized by including a crystalline phase that has a predetermined composition and having a specific peak in a powder X-ray diffraction pattern.

An embodiment provides a red phosphor satisfying the following structural formula and a light emitting device including the same.

K.sub.2M.sub.1-xMn.sup.4+.sub.XF.sub.6[Structural Formula]

Here, M is at least one element selected from the group consisting of a Group IV element and a Group XIV element, and X satisfies 0.028X0.055.

A light emitting device is provided. The light emitting device includes a light emitting element, which emits blue light, and a light transmissive member having a first principal face bonded to the light emitting element and a second principal face opposite the first principal face. The light transmissive member has a light transmissive base material and wavelength conversion substances, which are contained in the base material and which absorb the light from the light emitting element and emit light. The wavelength conversion substances are localized in the base material towards the first principal face, and include a first phosphor which emits green to yellow light and a second phosphor which emits red light. The first phosphor is more localized towards the first principal face than the second phosphor. The second phosphor is a manganese-activated fluoride phosphor.

A quantum dot includes a core-shell structure including a core including a first semiconductor nanocrystal and a shell disposed on the core, and including a material at least two different halogens, and the quantum dot does not include cadmium.

The present invention addresses providing a novel narrowband red phosphor having a high internal quantum efficiency, a short afterglow time, and a large number of emission components in a short-wavelength region with high red visibility. This is solved by a phosphor characterized by including a crystalline phase that has a predetermined composition and having a specific peak in a powder X-ray diffraction pattern.

A light emitting device is provided. The light emitting device includes a light emitting element, which emits blue light, and a light transmissive member having a first principal face bonded to the light emitting element and a second principal face opposite the first principal face. The light transmissive member has a light transmissive base material and wavelength conversion substances, which are contained in the base material and which absorb the light from the light emitting element and emit light. The wavelength conversion substances are localized in the base material towards the first principal face, and include a first phosphor which emits green to yellow light and a second phosphor which emits red light. The first phosphor is more localized towards the first principal face than the second phosphor. The second phosphor is a manganese-activated fluoride phosphor.