Design principles for phosphors

Phosphor-converted white-light-emitting diodes (pc-WLEDs) are efficient light sources used in lighting, high-tech displays, and electronic devices. A long- standing in this field concerns understanding the variation of the color of the emitted light with temperature. A detailed vibrational analysis of the prototypical phosphor material YAG:Ce that was just published in Chemistry of Materials, now reveals the intricate coupling between the local distortions around Ce atoms and vibrational modes. On this basis it was then possible to formulate design principles that are applicable to a broad class of phosphors.