Nearly 282 million people faced hunger in 2023 — report
The number of people suffering acute food insecurity rose in 2023 for the fifth year in a row, according to a UN-led report...
Deutsche Welle
Light-emitting diode
Semiconductor and solid-state light source
A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light is determined by the energy required for electrons to cross the band gap of the semiconductor. White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device.
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