A marker (100) for illuminating an area of an aircraft comprises a light emitting material (104) comprising: a persistent photoluminescent material arranged to emit light from a first region of the electromagnetic spectrum in response to an excitation; and a fluorescent or phosphorescent dye arranged to absorb light emitted by the persistent photoluminescent material, and emit light from a second, different, region of the electromagnetic spectrum, in response to the absorption of light of the first region of the electromagnetic spectrum. The fluorescent or phosphorescent dye absorbs substantially all of the light emitted by the photoluminescent material. The marker may in some cases two or more regions with light emitting material that have different fluorescent or phosphorescent dyes and emit light in different regions of the electromagnetic spectrum. The marker may be used in emergency exit signs, emergency path markers, seat markings etc.
Markers
2018-02-07
Patent
Electronic Resource
English
British Library Conference Proceedings | 2007
|NTIS | 2005
|