Patent ID: 8363307

Claim:
An optical device that emits monochromatic light of a wavelength tunable within a multicolor range comprising a light source that emits light at a short wavelength; a thermochromic fluorescent filter comprising a quantum confinement device that converts the short-wavelength light to a long wavelength within the multicolor range and emits the long-wavelength light; a heating device coupled with the thermochromic fluorescent filter; a cooling device coupled with the thermochromic fluorescent filter; a temperature sensor coupled with the thermochromic fluorescent filter; and a temperature regulating unit connected to each of the heating device, the cooling device and the temperature sensor, wherein the temperature regulating unit receives temperature data from the temperature sensor and sends control signals to the heating device and the cooling device to adjust the temperature of the thermochromic fluorescent filter and thereby select the wavelength of the long-wavelength light within the multicolor range.