Optical member, and backlight unit and liquid crystal display device using said optical member

An optical member, comprising, in the stated order:

• a polarizing plate which includes an absorption-type polarizer;
• a reflective polarizer;
• a second barrier layer,
• a second wavelength conversion layer;
• a first wavelength conversion layer;
• and
• a first barrier layer;
• wherein the first wavelength conversion layer includes a matrix and a first wavelength conversion material dispersed in the matrix and having a predetermined center emission wavelength,
• wherein the second wavelength conversion layer includes a matrix and a second wavelength conversion material dispersed in the matrix and having a center emission wavelength different from that of the first wavelength conversion material,
• wherein the matrix of the first wavelength conversion layer and the matrix of the second wavelength conversion layer each comprise a pressure-sensitive adhesive
• wherein one of the first wavelength conversion material and the second wavelength conversion material has a center emission wavelength in a wavelength band ranging from 515 nm to 550 nm, and another thereof has a center emission wavelength in a wavelength band ranging from 605 nm to 650 nm, and
• wherein the first wavelength conversion material and the second wavelength conversion material each comprise quantum dots.