Bright Warm White Emission of Nd_0.9Yb_0.1AlO₃ Nanocrystals under High Power Density Infrared Excitation

Laser induced white emission (LIWE) occurs when exciting a material with a focused infrared laser and it is characterized by an emission of warm white light and a non-linear intensity increase with excitation power, to cite a few. Therefore, it can be used as a new source for indoor lighting. Herein, we describe the LIWE for Nd 0.9 Yb 0.1 AlO 3 nanocrystals with both 808 nm and 975 nm focused excitation in vacuum and atmospheric pressure and its light characteristics, with a correlated color temperature (CCT) around 2200 K. Additionally, an intervalence charge transfer (IVCT) mechanism is proposed to explain the origin of such emission.