Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1999-07-01
2000-09-12
Ben, Loha
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359270, 359275, 345105, G02F 115
Patent
active
061185728
ABSTRACT:
A light activated photoelectrochromic device is formed of a two-component system formed of a photoactive charge carrier generating material and electrochromic material (plus an elecrolyte). Light interacts with a semiconductive material to generate hole-electron charge carriers which cause a redox reaction in the electrochromic material. One device is formed of hydrated nickel oxide as the electrochromic layer and polycrystalline titanium dioxide as the charge generating material. The materials may be formed as discrete layers or mixed together. Because of the direct charge transfer between the layers, a circuit to apply a voltage to drive the electrochromic reaction is not required, although one can be used to enhance the reaction. The hydrated nickel oxide-titanium dioxide materials can also be used to form a photovoltaic device for generating electricity.
REFERENCES:
patent: 4599614 (1986-07-01), DeBerry et al.
patent: 5307201 (1994-04-01), Passerini et al.
patent: 5604626 (1997-02-01), Teowee et al.
patent: 5805330 (1998-09-01), Byker et al.
Kostecki Robert
McLarnon Frank R.
Ben Loha
Sartorio Henry P.
The Regents of the University of California
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