Photo-induced transferred charge in rare-earth-doped alkaline-earth sulfide electroluminescent thin films

The spectral response of the photo-induced transferred charge in Eu 2+ - or Ce 3+ -doped CaS and SrS thin-film electroluminescent (EL) devices has been studied. It is found that excitation spectra of the photo-induced transferred charge agree with those of photoluminescence. This result implies that...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 30; no. 6A; pp. L1021 - L1024
Main Authors TANAKA, S, YOSHIYAMA, H, NAKAMURA, K, WADA, S, MORITA, H, KOBAYASHI, H
Format Journal Article
LanguageEnglish
Published Tokyo Japanese journal of applied physics 01.06.1991
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
Optical properties of specific thin films
Physics
Impurity
Multiple layer
Cerium
Excitation spectrum
Electroluminescence
Strontium Sulfides
Experimental study
Charge transfer
Europium
Calcium Sulfides
Inorganic compound
Thin film
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Summary:The spectral response of the photo-induced transferred charge in Eu 2+ - or Ce 3+ -doped CaS and SrS thin-film electroluminescent (EL) devices has been studied. It is found that excitation spectra of the photo-induced transferred charge agree with those of photoluminescence. This result implies that the Eu 2+ or Ce 3+ luminescent centers are ionized by electric field when the centers are excited to the (4f) n -1 (5d) excited state. The dynamics of the EL emission are controlled by field-dependent ionization of the luminescent centers and by field-dependent trapping at the ionized centers, rather than by impact excitation of the luminescent centers.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.30.l1021