Wavelength conversion plate and light emitting device using the same
View Patent ↗Provided is a wavelength conversion plate having excellent luminous efficiency of a wavelength-converted light. The wavelength conversion plate includes a dielectric layer with nano pattern, a metal layer formed inside the nano pattern, and a wavelength conversion layer formed on the metal layer and having quantum dot or phosphor which wavelength-converts an excitation light to generate a wavelength-converted light.
1. A light emitting device comprising:
a light emitting element;
a groove part having a bottom surface where the light emitting element is mounted, and a side surface where a reflection part is formed;
a support part supporting the groove part and comprising an electrode part electrically connected to the light emitting element; and
a wavelength conversion plate disposed in at least one of the bottom surface and the side surface of the groove part, the wavelength conversion plate comprising:
a dielectric layer with a nano pattern, wherein the nano pattern comprises a plurality of nano scale grooves;
a metal layer formed on an inside wall of the nano scale grooves of the nano pattern; and
a wavelength conversion layer formed on the metal layer and comprising quantum dot or phosphor which wavelength-converts an excitation light to generate a wavelength-converted light.
2. The light emitting device of claim 1 , further comprising a wavelength conversion unit disposed on the light emitting element and comprising quantum dot or phosphor which wavelength-converts light from the light emitting element.
3. The light emitting device of claim 2 , wherein the wavelength conversion unit is implemented with a plurality of layers.
4. The light emitting device of claim 3 , wherein at least two wavelength conversion units among the plurality of wavelength conversion units comprise quantum dots or phosphors which convert the light emitted from the light emitting element into light having different wavelengths.
5. The light emitting device of claim 4 , wherein the light emitting element emits an infrared light;
the wavelength conversion plate emits a blue light;
a first wavelength conversion unit among the plurality of wavelength conversion units emits a red light; and
a second wavelength conversion unit different from the first wavelength conversion unit among the plurality of wavelength conversion units emits a green light.
6. The light emitting device of claim 2 , wherein the wavelength conversion unit is formed inside the groove part where the light emitting element is mounted.