Exciton emission from forward-biased zinc selenide Schottky diodes |
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Authors: | MD Ryall JW Allen |
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Institution: | Wolfson Institute of Luminescence, School of Physical Sciences, University of St. Andrews, Fife, Scotland |
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Abstract: | Exciton emission has been observed in the forward-biased electroluminesence of ZnSe Schottky diodes free of intentionally added luminescent centres. The emission has been studied from ≈ 95° K to room temperature and is attributed to the recombination of free excitons (zero-LO phonon line). No LO phonon side bands were observed. As with exciton photoluminescence in CdS the half-width of the emission line, although a linear function of temperature, is greater than that predicted by theory. At temperatures below ≈150°K pair emission was also observed. |
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