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Fabrication and properties of gallium phosphide variable colour displaysThe unique properties of single-junction gallium phosphide devices incorporating both red and green radiative recombination centers were investigated in application to the fabrication of monolithic 5 x 7 displays capable of displaying symbolic and alphanumeric information in a multicolor format. A number of potentially suitable material preparation techniques were evaluated in terms of both material properties and device performance. Optimum results were obtained for double liquid-phase-epitaxial process in which an open-tube dipping technique was used for n-layer growth and a sealed tipping procedure for subsequent p-layer growth. It was demonstrated that to prepare devices exhibiting a satisfactory range of dominant wavelengths which can be perceived as distinct emission colors extending from the red through green region of the visible spectrum involves a compromise between the material properties necessary for efficient red emission and those considered optimum for efficient green emission.
Document ID
19740004321
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Effer, D. (Bowmar Canada Ltd. Ottawa Ontario, Canada)
Macdonald, R. A. (Bowmar Canada Ltd. Ottawa Ontario, Canada)
Macgregor, G. M. (Bowmar Canada Ltd. Ottawa Ontario, Canada)
Webb, W. A. (Bowmar Canada Ltd. Ottawa Ontario, Canada)
Kennedy, D. I. (Bowmar Canada Ltd. Ottawa Ontario, Canada)
Date Acquired
September 3, 2013
Publication Date
July 1, 1973
Subject Category
Physics, Solid-State
Report/Patent Number
NASA-CR-132311
Accession Number
74N12434
Funding Number(s)
CONTRACT_GRANT: NAS1-11523
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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