Patent ID: 8906713

Claim:
A method of forming a lighting device comprising: printing a first plurality of light emitting diode (LED) chips on a substrate, the first plurality of LED chips emitting a first peak emission wavelength and emitting blue light; printing a second plurality of LED chips on the substrate, the second plurality of LED chips emitting a second peak emission wavelength longer than the first peak emission wavelength and generating a light greener than the blue light, wherein the first plurality of LED chips and second plurality of LED chips are printed on a substrate as an LED ink; and providing a layer of the same wavelength-converting material over both the first plurality of LED chips and the second plurality of LED chips for converting the blue light and the greener light to longer wavelength light, wherein light generated by the lighting device is a mixture of blue light from the first plurality of LED chips, greener light from the second plurality of LED chips, and longer wavelengths of light from the wavelength-converting material to create a white light.