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An LED coated with a yellow “phosphor” is shown turned off (left) and then turned on (right). This “green” LED is inexpensive and provides warm white light (Credit: Zhichao Hu, Ph.D.)https://www.led-professional.com/media/technology_light-generation_researchers-propose-new-technology-without-rare-eart-metals-for-led-lighting_New%20type%20of%20phosphor%20converted%20LED.jpg/viewhttps://www.led-professional.com/media/technology_light-generation_researchers-propose-new-technology-without-rare-eart-metals-for-led-lighting_New%20type%20of%20phosphor%20converted%20LED.jpg/@@images/image-1200-c2463b19b6a4b308291a2df1f5995636.jpeg
An LED coated with a yellow “phosphor” is shown turned off (left) and then turned on (right). This “green” LED is inexpensive and provides warm white light (Credit: Zhichao Hu, Ph.D.)
