2020年12月23日 星期三

Tuneable white-emitting LED needs no phosphor

Researchers in Saudi Arabia have demonstrated white light emission from a phosphor-less LED. Generally, ‘white’ LEDs have a blue-emitting die topped with phosphors that convert some of that blue to broad-spectrum amber – which combined with the residual blue is seen by humans as cool white. Adding a red-emitting phosphor in the mix produces warm white ...

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