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Vacuum Deposition Films of Squarylium Dyes

IP.com Disclosure Number: IPCOM000085711D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Duran, J: AUTHOR

Abstract

The vacuum deposition squarylium dye in the past has been unsatisfactory due to the occurrence of thermal decomposition. Under the vacuum deposition conditions set forth below thermal decomposition is avoided.

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Vacuum Deposition Films of Squarylium Dyes

The vacuum deposition squarylium dye in the past has been unsatisfactory due to the occurrence of thermal decomposition. Under the vacuum deposition conditions set forth below thermal decomposition is avoided.

A thin layer of pulverized squarylium dye is placed on a glass surface. The thickness of the dye layer is critical and is between 20 to 50 microns. This is the order of a single layer of crystals. Squarylium dye has a low-thermal conductivity,
i.e., it has poor heat transfer characteristics. For this reason a very thin or single layer must be used, because layers having a thicker or stacked layer do not conduct the heat throughout the dye fast enough to avoid the thermal decomposition.

The temperature range is 90 degrees C to 260 degrees C. At temperatures above 260 degrees C thermal decomposition occurs. The pressure used is between 1 x 10/-3/ torr and 1 x 10/-6/ torr.

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