Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1994-01-24
1995-06-06
Hannaher, Constantine
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
2504861, 2504871, G01J 158
Patent
active
054224896
ABSTRACT:
A glowing device comprises a substrate which is substantially transparent to radiation in a first spectral region and supports a nanoparticle or nanocrystal active layer, which is a thin layer constituted of separated tiny particles with nanometer dimensions, typically 100 .ANG. or less in size. When the nanocrystal layer comprises one of certain luminescent materials activated with certain activators, the layer when excited will efficiently emit radiation characteristic of the activator. Since the particles making up the active layer are very small, the layer can be made very thin, of the order of 1000 .ANG. or less. With this small thickness, the layer will be substantially transparent to radiation except for a narrow range of radiation capable of being absorbed by the active layer and thus capable of exciting the nanocrystal layer. When thus excited, the active layer will emit radiation in a narrow wavelength range. When the incident radiation extends over a broad spectral region, then part of the spectral energy will be absorbed and converted to the radiation characteristic of the nanocrystal layer, and the rest will pass through the nanocrystal layer and substantially transparent substrate, which to an observer will appear to glow with light in the narrow wavelength range. By providing multiple layers of nanocrystals, each responsive to a different part of the spectrum, a larger part of the incident radiation energy will be converted to glowing light.
REFERENCES:
patent: 3525864 (1970-08-01), Leach
patent: 4647399 (1987-03-01), Peters et al.
patent: 4772417 (1988-09-01), Pappalardo et al.
patent: 4931312 (1990-06-01), De Leeuw et al.
Glick Edward J.
Hannaher Constantine
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