Electroluminescence of Sm3+ ions in semiconducting polycrystalline zinc oxide
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 2 (7) , 727-732
- https://doi.org/10.1039/jm9920200727
Abstract
Characteristic emissions at 575, 615 and 665 nm have been observed in a three-electrode electrochemical cell under anodic polarization for Sm3+ ions inserted into a semiconducting zinc oxide electrode. The electroluminescence intensity varies with the square-root of the reciprocal of the applied potential according to the Alfrey–Taylor equation. The intensity of the light emitted increases with dopant concentration and reaches a maximum for ca. 0.5 atom% of Sm3+ in ZnO; above this concentration the light intensity decreases. Structural analysis of a polycrystalline sample by scanning electron microscopy indicates that the inserted rare-earth ions induce important dislocations in the polycrystalline structure and do not substitute for zinc in the crystal lattice.Keywords
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