Investigation of Photoconductivity in ZnS and CdS Phosphors with Microwave Methods

Microwave techniques are applied to measure the photoconductivity of activated CdS and ZnS phosphor powders. Polarization effects, which are a source of error in dc and low-frequency ac measurements, and surface effects introduced by electrodes are eliminated by the use of microwaves. The conduction...

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Bibliographic Details
Published in:Journal of applied physics 1968-01, Vol.39 (9), p.4252-4256
Main Authors: Kalikstein, Kalman, Kramer, Bernard, Gelfman, Samuel
Format: Article
Language:English
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Summary:Microwave techniques are applied to measure the photoconductivity of activated CdS and ZnS phosphor powders. Polarization effects, which are a source of error in dc and low-frequency ac measurements, and surface effects introduced by electrodes are eliminated by the use of microwaves. The conduction-band electron density is determined by a waveguide perturbation calculation from the measurement of wave-propagation characteristics in the phosphors. For radiation at 5150 Å and incident light intensity of 170 μW/cm2, there is a density of 1014 conduction electrons per unit volume (cm3) in a CdS (Cl, Cu) powder. In ZnS (Cl, Cu), the electron density is 3×1013 at 8700 μW/cm2 intensity in the 3600 to 6000 Å wavelength band. When long-wavelength ir radiation is added to the exciting light the photoconductivity is decreased.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1656956