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==Phosphor degradation==
Many phosphors tend to lose efficiency gradually by several mechanisms. The activators can undergo change of [[valence (chemistry)|valence]] (usually [[oxidation]]), the [[crystal lattice]] degrades, atoms – often the activators – diffuse through the material, the surface undergoes chemical reactions with the environment with consequent loss of efficiency or buildup of a layer absorbing
The degradation of electroluminescent devices depends on frequency of driving current, the luminance level, and temperature; moisture impairs phosphor lifetime very noticeably as well.
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