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1996
Journal Article
Titel
Luminescence properties of SrS:Ce3+, Cl thin films
Abstract
Excitation spectroscopy and photoluminescence investigations have been carried out to evaluate the luminescence properties of SrS:Ce-based thin films. The results are compared with those obtained on efficient powders. The application of a model developed for cathodoluminescence leads to the assumption that the defect density in the thin films is much higher than in powders. These defects act as killers leading to a reduced photoluminescence yield. The nature of the defects is not clearly identified; however, Ce doping-induced Sr vacancies are proposed as possible candidates. As a consequence, Mn co-doping has been applied, leading to a significantly improved PL and EL performance of the luminescent layers. An EL efficacy of 1.8 lm/W at 1- mu C/cm2 transferred charge and 60-Hz driving frequency has been obtained.
Language
English
Tags
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cathodoluminescence
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cerium
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electroluminescence
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electroluminescent displays
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optical films
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phosphors
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photoluminescence
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powders
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strontium compounds
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excitation spectroscopy
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luminescence properties
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defect density
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photoluminescence yield
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defects
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sr vacancies
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mn co-doping
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driving frequency
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transferred charge
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tfel
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thin film phosphors
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phosphor doping
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60 hz