Field emission light source

A field emission light source chip configured to emit ultraviolet (UV) light, comprising:

• a field emission cathode comprising a plurality of zinc oxide (ZnO) nanostructures formed on a substrate, the substrate being adapted for a modular manufacturing process;
• an anode structure comprising:
• a transparent substrate,
• a first wavelength converting material arranged to cover at least a portion of the anode structure, wherein the first wavelength converting material is arranged directly adjacent to the transparent structure and is configured to receive electrons emitted from the field emission cathode and to emit light of a first wavelength range, and
• a conductive anode layer composed of a light reflective aluminum layer deposited onto the first wavelength converting material, wherein the conductive anode layer during use is arranged to have a voltage potential differing from the field emission cathode, whereby the electrons emitted from the field emission cathode will pass through the conductive anode layer before being received by the first wavelength converting material;
• and
• a spacer structure arranged to:
• encircle the plurality of nanostructures,
• set a predetermined distance between the anode structure and the field emission cathode, and
• form a hermetically sealed and subsequently evacuated cavity between the substrate of the field emission cathode and the anode structure.