Abstract:
The present invention generally relates to a field emission light source and specifically to a compact field emission light source configured for two-stage light conversion. The field emission light source comprises a field emission cathode (106) comprising a plurality of nanostructures (104) formed on a wafer, an electrically conductive anode structure (108) comprising a first wavelength converting material (118) arranged to cover at least a portion of the anode structure, and means for forming an hermetically sealed and subsequently evacuated cavity (306) between the substrate of the field emission cathode and the anode structure. In a preferred embodiment, the anode structure includes a first wavelength converting material (118) comprising a phosphor material (e.g. ZnS), and a second wavelength converting material (120) comprising quantum dots generating light at a second wavelength range when receiving light at the first wavelength range, where the second wavelength range is at least partly higher than the first wavelength range.
Abstract:
An electron/photon source based on field emission, cathodoluminescence and photo-enhanced field emission, comprising an evacuated chamber inside a housing, further comprising an anode and a cathode arranged inside said evacuated chamber. Furthermore, the cathode is arranged to emit electrons when a voltage is applied between the anode and cathode, said anode being arranged to emit light at a first wavelength range when receiving electrons emitted from said cathode, and a wavelength range converting material arranged to receive said emitted light of said first wavelength range and emit light at a second wavelength range. In a novel way, the present invention makes it possible to, in two steps, convert the electrons emitted from the cathode to visible light. The invention has shown to be advantageous, and makes it possible to select new emission materials, manufactured at a fraction of the cost associated with the earlier used materials where the electron to visible light conversion was done in one step.
Abstract:
An electron/photon source based on field emission, cathodoluminescent and photo-enhanced field emission, comprising an evacuated chamber inside a housing, further comprising an anode and a cathode arranged inside said evacuated chamber. Furthermore, the cathode is arranged to emit electrons when a voltage is applied between the anode and cathode, said anode being arranged to emit light at a first wavelength range when receiving electrons emitted from said cathode, and a wavelength range converting material arranged to receive said emitted light of said first wavelength range and emit light at a second wavelength range. In a novel way, the present invention makes it possible to, in two steps, convert the electrons emitted from the cathode to visible light. The invention has shown to be advantageous, and makes it possible to select new emission materials, manufactured at a fraction of the cost associated with the earlier used materials where the electron to visible light conversion was done in one step.
Abstract:
The present invention generally relates to a field emission light source and specifically to a miniaturized field emission light source that is possible to manufacture in large volumes at low cost using the concept of wafer level manufacturing, i.e. a similar approach as used by IC's and MEMS. The invention also relates to a lighting arrangement comprising at least one field emission light source. The field emission light source comprises: - a field emission cathode (106) comprising a plurality of nanostructures (104) formed on a substrate; - an electrically conductive anode structure (108) comprising a first wavelength converting material (118) arranged to cover at least a portion of the anode structure, wherein the first wavelength converting material is configured to receive electrons emitted from the field emission cathode and to emit light of a first wavelength range, and - means for forming an hermetically sealed and subsequently evacuated cavity (106) between the substrate of the field emission cathode and the anode structure, including a spacer structure (302, 110) arranged to encircle the plurality of nanostructures, wherein the substrate for receiving the plurality of nanostructures is a wafer (102').
Abstract:
Dispositif pour émettre de la lumière ultraviolette comprenant un barreau (13) muni de nanotubes de carbone, une première couche (11) composée d'un premier matériau cathodoluminescent dans le domaine des radiations lumineuses ultraviolettes UV-C pour une excitation de ce premier matériau cathodoluminescent par des électrons d'énergie comprise entre 1keV et 8keV, une seconde couche (12), composée d'un second matériau métallique, conducteur pour l'électricité, et une chambre (10) composée d'un troisième matériau, transparent pour les radiations lumineuses ultraviolettes UV-C. La première couche (11) est disposée en contact mécanique avec la chambre (10), le long d'une paroi intérieure de la chambre. La seconde couche(12) est disposée en contact mécanique avec la première couche (11). Le barreau(13) est disposé à l'intérieur de la chambre(lO), en regard de la seconde couche (12). La seconde couche métallique(12) est d'une épaisseur adaptée à la rendre partiellement transparente pour les électrons d'énergie comprise entre 1keV et 8keV.