Semiconductors can emit light {electroluminescence}| across pn junctions when current flows. Phosphors can glow if AC current passes through. Machine sprays glass panel with thin transparent metal layer, adds a phosphor layer, and adds thin metal foil. Electroluminescence is efficient and cool but allows only low light levels.
Physical Sciences>Physics>Electromagnetism>Conductivity>Semiconductor
5-Physics-Electromagnetism-Conductivity-Semiconductor
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Date Modified: 2022.0224