Saturation Mechanisms in Common LED Phosphors
Marie Anne van de Haar, Mohamed Tachikirt, Anne C. Berends, Michael R. Krames, Andries Meijerink, Freddy T. Rabouw
Abstract
, and unravel their saturation mechanisms. Experiments with square-wave-modulated laser excitation reveal the dynamics of absorption and decay of the luminescent centers. By modeling these dynamics and linking them to the saturation of the phosphor output intensity, we distinguish saturation by ground-state depletion, thermal quenching, and ionization of the centers. We discuss the implications of each of these processes for LED applications. Understanding the saturation mechanisms of popular LED phosphors could lead to strategies to improve their performance and efficiency or guide the development of new materials.
Topics & Concepts
PhosphorLight-emitting diodeBlue lightOptoelectronicsMaterials scienceDiodeOrange (colour)Saturation (graph theory)Green-lightOpticsPhysicsMathematicsCombinatoricsLuminescence Properties of Advanced MaterialsGas Sensing Nanomaterials and SensorsPerovskite Materials and Applications