Patent US6127989A successfully refreshed from Google Patents.
Patent US4605849A successfully refreshed from Google Patents.
US4605849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive devices having enhanced blue light response
Assignee: Polaroid Corp
•
Filing: 1984-10-31
•
Granted: 1986-08-12
•
Expires: 2004-10-31
Abstract
Abstract The blue light response of solid state photosensitive devices such as silicon based charge-coupled devices (CCDs), charged-injection devices, photovoltaic devices and the like is enhanced by applying to the surface thereof a thin layer which includes a first, or donor, dye which absorbs efficiently in the blue region of the spectrum and a second, or acceptor, dye which absorbs efficiently in the green region of the spectrum, there being substantial overlap between the emission spectrum of the donor and the absorption spectrum of the acceptor. The relative concentrations of the dyes are controlled such that the donor dye transfers energy nonradiatively to the acceptor dye which is caused to fluoresce thereby emitting light in the region where the device has substantial photoresponse.
Inventors
- 👤 Peter O. Kliem
- 👤 Alan B. Fischer
- 👤 Shai Inbar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:22
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/30; H10F77/306
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
A photosensitive element having enhanced blue light photoresponse comprising a solid state photosensitive device carrying on a surface thereof a thin layer comprising a donor dye and an acceptor dye uniformly dispersed in an optically transparent polymeric binder material, wherein said donor dye absorbs light in the blue region of the spectrum and said acceptor dye absorbs light in the green region of the spectrum, there is substantial overlap between the fluorescence emission spectrum of the donor dye and the absorption spectrum of the acceptor dye, said donor and acceptor dyes being present in relative amounts such that said donor dye is adapted to transfer at least a substantial portion of the energy from its singlet excited state nonradiatively to said acceptor dye.
Claim 2
Dependent Claim
123 words
A photosensitive element having enhanced blue light photoresponse comprising a solid state photosensitive device carrying on a surface thereof a thin layer comprising a donor dye and an acceptor dye uniformly dispersed in an optically transparent polymeric binder material, wherein said donor dye absorbs light in the blue region of the spectrum and said acceptor dye absorbs light in the green region of the spectrum, there is substantial overlap between the fluorescence emission spectrum of the donor dye and the absorption spectrum of the acceptor dye, said donor and acceptor dyes being present in relative amounts such that said donor dye is adapted to transfer at least a substantial portion of the energy from its singlet excited state nonradiatively to said acceptor dye.
Claim 3
Dependent Claim
18 words
The photosensitive element as defined in claim 1 wherein said photosensitive device comprises a silicon based charge-coupled device.
Claim 4
Dependent Claim
35 words
The photosensitive element as defined in claim 2 wherein said donor dye has λ max of about 450 nm and said acceptor dye has λ max of from about 500 nm to about 600 nm.
Claim 5
Dependent Claim
22 words
The photosensitive element as defined in claim 3 wherein said acceptor dye has a quantum fluorescence yield of at least about 0.9.
Claim 6
Dependent Claim
21 words
The photosensitive element as defined in claim 2 wherein said dye layer has a thickness of about 1 micron or less.
Claim 7
Dependent Claim
9 words
The photosensitive element as defined in polymethylmethacrylate or trifluoropolyvinylalcohol.
Claim 8
Dependent Claim
9 words
The photosensitive element as defined in polymethylmethacrylate or trifluoropolyvinylalcohol.
References Cited (Backward Citations)
US3622316A
Cited
US3730714A
Cited
US3622317A
Cited
US3799783A
Cited
US3912931A
Cited
US3887271A
Cited
US4088508A
Cited
US4051374A
Cited
US4367930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |