New Technology Can Expand LED Lighting, Cutting Energy Use and Greenhouse Gas Emissions (image) American Chemical Society Share Print E-Mail Caption 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. Usage Restrictions Please credit Zhichao Hu. Ph.D. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.