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Improvement of the Nucleation and Growth of Thin Film Phosphors for Electroluminescent Flat Panel Displays

Published online by Cambridge University Press:  15 February 2011

T.S. Moss ,
B.F. Espinoza  and
R.C. Dye
T.S. Moss
Affiliation:
Los Alamos National Laboratory, M.S. E549, Los Alamos, NM 87545
B.F. Espinoza
Affiliation:
Los Alamos National Laboratory, M.S. E549, Los Alamos, NM 87545
R.C. Dye
Affiliation:
Los Alamos National Laboratory, M.S. E549, Los Alamos, NM 87545
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Abstract

The deposition of CaGa2S4:Ce has been accomplished using a commercial liquid delivery system on two substrate surfaces: ZnS and SrS. However, the film deposited on ZnS was not of satisfactory quality because of the formation of an amorphous layer and a high amount of residual porosity within the deposition. The use of a SrS layer on top of the ZnS improved the nucleation by reducing the interfacial energy between the substrate and deposition. It greatly reduced the porosity in the coating and reduced the formation of the amorphous layer. The crystallinity of the CaGa2S4 400 peak was also increased by a factor of ten when a layer of SrS was used. Further, the FWHM of the 400 peaks from the two depositions was not significantly different, indicating that the crystallite size and strain was approximately the same. The B40 was increased by a factor of two, from 1.84 cd/m2 for ZnS to 3.67 cd/m2 for SrS. This increase is an improvement in the performance of the films and is attributable to the increase in the crystallinity. To utilize these improvements, the ability to deposit both the SrS and CaGa2S4:Ce layers within the same reactor has been developed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 440: Symposia CA – Structure and Evolution of Surfaces , 1996 , 163
Copyright
Copyright © Materials Research Society 1997

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References

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