Keeping cool with quantum wells

University of Tokyo researchers have announced a new approach for electrical cooling without the need for moving parts. By applying a bias voltage to quantum wells made of the semiconductor aluminum gallium arsenide, electrons ...

Understanding high efficiency of deep ultraviolet LEDs

Deep ultraviolet light-emitting diodes (DUV-LEDs) made from aluminium gallium nitride (AlGaN) efficiently transfer electrical energy to optical energy due to the growth of one of its bottom layers in a step-like fashion. ...

EPA hits chemical maker for not notifying on new compounds

A chemical maker's North Carolina plant may have broken federal law by failing to notify the U.S. Environmental Protection Agency before it started manufacturing and repurposing new industrial compounds, the agency said this ...

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