The ink composition for this stereo-lithographic method of printing contains a photo-curable polymer with dispersible light converting sub-micron particles capable of crosslinking by photoactivation. This UV photoactivation forms a uniform and solid quantum dot composite film. The film takes advantage of the numerous benefits of monochrome pixelated LEDs as a substrate and adds the capacity to convert blue pixels to red and green pixels using the printed phosphor layer of quantum dot converters.
The apparatus uses projection micro-stereolithography, allowing for increased control over the dose of UV exposure, through the projection time and power. This optimally cures the polymer and quantum dot composite, resulting in a wavelength converting film.