White-emitting thin-film electroluminescence devices with SrS phosphor doubly activated with rare-earth ions

Thin-film electroluminescence (TFEL) devices with SrS-based phosphor layers have been investigated to obtain white emissions by mixing emissions of two different rare-earth activators, and new white-emitting phosphor layers, except for SrS:Pr, Ce, have been developed. SrS:Sm, Ce and SrS:Nd, Ho phosp...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1990-10, Vol.29 (10), p.1987-1990
Main Authors: OKAMOTO, S, NAKAZAWA, E, TSUCHIYA, Y
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other luminescence and radiative recombination
Physics
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Summary:Thin-film electroluminescence (TFEL) devices with SrS-based phosphor layers have been investigated to obtain white emissions by mixing emissions of two different rare-earth activators, and new white-emitting phosphor layers, except for SrS:Pr, Ce, have been developed. SrS:Sm, Ce and SrS:Nd, Ho phosphor layers show white El-emissions, whose color coordinates correspond to points in the white area on the CIE chromaticity diagram. The EL emissions of SrS:Pr, Ce, SrS:Nd, Ce, and SrS:Ho, Ce phosphor layers are not found in the white area, but are close to the area. Luminance of the emissions, for devices driven with a sinusoidal voltage of 5 kHz, are 200–750 cd/m 2 , The three primary colors, red, green and blue, can be extracted from the emission of all these devices with color filters. Relative intensities of the three extracted colors are evaluated.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.29.1987