Quantum dots based optical filter

A quantum dot based optical filter, comprising:

• a plurality of high refractive index layers;
• a plurality of low refractive index layers alternatingly disposed between the high refractive index layers, wherein the plurality of high refractive index layers and the plurality of low refractive index layers are configured to reflect a first wavelength of light;
• and
• a plurality of quantum dots dispersed in a plurality of layers, the plurality of layers selected from a group consisting of:
• the plurality of high refractive index layers and the plurality of low refractive index layers, the quantum dots capable of absorbing the first wavelength of light and emitting a second wavelength of light.

An apparatus comprising:

• a substrate having a first surface and a second surface opposite the first surface;
• means for converting a first wavelength light to a second wavelength of light, the converting means positioned on the first surface of the substrate;
• and
• means for reflecting the first wavelength of light, the reflecting means positioned on the second surface of the substrate, the reflecting means comprising:
• a plurality of high refractive index layers;
• and
• a plurality of low refractive index layers alternatingly disposed between the high refractive index layers, wherein the plurality of high refractive index layers and the plurality of low refractive index layers are configured to reflect the first wavelength of light.

A method of manufacturing a quantum dot based optical filter, comprising:

• forming a first high refractive index layer on a substrate;
• forming a first low refractive index layer on the first high refractive index layer;
• forming a second high refractive index layer on the first low refractive index layer, the second high refractive index layer being identical or substantially identical in thickness and composition as the first high refractive index layer;
• and
• forming a second low refractive index layer on the second high refractive index layer, the second low refractive index layer being identical or substantially identical in thickness and composition as the first low refractive index layer, wherein each of the high refractive index layers or each of the low refractive index layers include a plurality of quantum dots dispersed therein, the quantum dots capable of absorbing a first wavelength of light and emitting a second wavelength of light.