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Surface Textured Epitaxial Luminescent Films with High Optical Efficiency for Projection Cathode Ray Tubes

IP.com Disclosure Number: IPCOM000050434D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chang, IF: AUTHOR [+4]

Abstract

A screen for a projection CRT including a transparent single crystal substrate, a micro-faceted layer formed on the substrate, and a phosphor layer formed thereon, and supported by the substrate whereby light trapping in the screen is reduced. In particular, the micro-faceted layer is formed by immersion of a garnet layer in fluxed melts above their saturation temperature.

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Surface Textured Epitaxial Luminescent Films with High Optical Efficiency for Projection Cathode Ray Tubes

A screen for a projection CRT including a transparent single crystal substrate, a micro-faceted layer formed on the substrate, and a phosphor layer formed thereon, and supported by the substrate whereby light trapping in the screen is reduced. In particular, the micro-faceted layer is formed by immersion of a garnet layer in fluxed melts above their saturation temperature.

Epitaxial phosphor layers are potentially useful as projection CRT screens due to their excellent resistance to electron beam degradation. The smooth continuous character of the epitaxial layer, however, gives rise to light trapping which appreciably lowers the efficiency of light emission from the layer.

This article discloses a convenient and effective method for forming ing a micro-faceted layer with greatly reduced light trapping.

It has been found that epitaxial garnet layers may become deeply faceted by immersion in fluxed melts above their saturation temperature. The resulting structure consists of faceted "hemispherical" forms with a repeat distance of approximately 2 Mum and has desirable characteristics for maximizing light emission from the layer.

For example, Tb-doped GGC(Gd(3) Ga(5) O(12) garnet) epitaxial films 1 to 5 Mum thick grown from fluxed melts could ge greatly improved for use as a projection CRT screen by immersion after growth into a melt above the saturation (liqui...