Scientists at the University of Georgia develop new materials for warm white LED lights
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Pan Zheng, an associate professor at the University of Georgia, has two main indicators for measuring the quality of artificial light: correlated color temperature and color reproduction. The correlated color temperature is used to measure the warmth and cold of light. For indoor lighting, the color temperature is lower than 4000K (Kelvin temperature) is ideal, and the correlated color temperature is higher than 5000K, the illuminator will emit a light blue cold light like a white LED light. Another important indicator is the degree of color reproduction, the ability of a light source to simulate natural light. A reduction of more than 80 is ideal for indoor lighting, and below this value the color will appear distorted.
Pan Zhengwei said that by applying a different color of phosphor to the outer layer of the blue LED chip, warm white light can be emitted, so that a phosphor-based white LED lamp can be made. However, it is laborious and costly to match these raw materials in precise proportions, and the resulting color will vary, as each raw material reacts differently to temperature changes.
In order to develop a new phosphor, Pan Zhengwei and his team selected cerium oxide, aluminum oxide, cerium oxide and graphite powder, each of which was mixed in small amounts. They then placed the powdered material in a tube furnace and heated it to 1450 degrees Celsius. The vacuum in the furnace causes the vaporized material to fall onto the disk, depositing yellow luminescent compounds, and then loading them into the bulb.
Pan Zhengwei emphasized that the light efficiency of the new material is much lower than the current light blue white LED lamp. In addition, large-scale production will also face challenges. 