Emergency lighting element
AssigneeLufthansa Technik AG
InventorWolfgang Sutter
Life of this patent
Estimating the term…
Abstract
An emergency lighting element includes a planar, electrically operable radiation source for planar emission of electromagnetic radiation at a front side of the radiation source; and a long-afterglow layer over a whole area on the front side of the radiation source. A penetration depth into the long-afterglow layer for radiation emitted by the radiation source corresponds at least to a thickness of the long-afterglow layer. The long-afterglow layer comprises phosphorescent material, an absorption spectrum of the long-afterglow layer at least partly overlaps an emission spectrum of the radiation source and an emission spectrum of the long-afterglow layer lies substantially in a visible range.
Claims15
An emergency lighting element, comprising:
- a planar, electrically operable radiation source for planar emission of electromagnetic radiation at a front side of the radiation source, wherein the radiation source is configured to emit electromagnetic radiation in the UV range;
- a long-afterglow layer over a whole area on the front side of the radiation source;
- and
- a UV filter tuned to the radiation of the radiation source is disposed on a side of the long-afterglow layer facing away from the radiation source,
- wherein a penetration depth into the long-afterglow layer for radiation emitted by the radiation source corresponds at least to a thickness of the long-afterglow layer,
- wherein the long-afterglow layer comprises phosphorescent material, an absorption spectrum of the long-afterglow layer at least partly overlaps an emission spectrum of the radiation source and an emission spectrum of the long-afterglow layer lies substantially in a visible range, and
- wherein emission of visible light by the emergency lighting element is effected solely by the long-afterglow layer.
Dependencies are inferred from the claim text.