Browse Prior Art Database

Photoinduced Electrochromism Panel

IP.com Disclosure Number: IPCOM000086128D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Seki, H: AUTHOR

Abstract

An improved PIE (photoinduced electrochromic) panel is described suitable for providing complimentary colors. A double-layered panel permits the use of several types of molecules with different color and electrochemical potential, which are used to achieve different color combinations. By controlling the light intensity a single color or the sum of colors is obtained.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 73% of the total text.

Page 1 of 2

Photoinduced Electrochromism Panel

An improved PIE (photoinduced electrochromic) panel is described suitable for providing complimentary colors. A double-layered panel permits the use of several types of molecules with different color and electrochemical potential, which are used to achieve different color combinations. By controlling the light intensity a single color or the sum of colors is obtained.

As shown in the figure, the outer layer contains a solution containing donor and acceptor molecules which provide a blue-green color under certain conditions. The device also contains an inner layer with a solution containing donor and acceptor molecules which provide red-orange-yellow colors under certain conditions. For example, the outer layer can contain a solution having a solvent CHC(13), an acceptor molecule CC(14) and a donor molecule DEASP (1-phenyl-3-diethylaminostyrl-5-diethyl- aminophenyl-2-pyrazoline).

The colored species has been identified as the stable radical cation DEASP/+2/. DEASP is oxidized at 0.16V (Ag/Ag/+/ ref. electrode in acetonitrile) to give a blue solution. However, diethylamino-triphenyl pyrazolines are oxidized at a slightly higher voltage, 0.17V (Ag/Ag/+/ ref. electrode in acetonitrile) to give a reddish solution. By the proper choice of molecules the appropriate colors and the electrochemical potential can be selected.

Initially a voltage is applied on the outer layer. A pattern is then written with a laser at an intensity level suf...