Increasing the Power: Absorption Bleach, Thermal Quenching, and Auger Quenching of the Red-Emitting Phosphor K_2TiF_6:Mn~(4+)

摘要

Mn~(4+)-doped fluorides are popular phosphors for warm-white lighting, convertingblue light from light-emitting diodes (LEDs) into red light. However,they suffer from droop, that is, decreasing performance at increasing power,limiting their applicability for high-power applications. Previous studieshighlight different causes of droop. Here, a unified picture of droop of Mn~(4+)-doped K_2TiF_6, accounting for all previously proposed mechanisms, is provided.Combining continuous-wave and pulsed experiments on samples ofdifferent Mn~(4+) content with kinetic Monte Carlo modeling, the contributionsof absorption bleach, thermal quenching, and Auger quenching at differentexcitation densities, are quantified. This work contributes to understandingthe fundamental limitations of these materials and may inspire strategies tomake Mn~(4+)-doped fluorides more efficient in high-power applications.