(076004)Review--The K_2SiF_6:Mn~(4+) (PFS/KSF) Phosphor

摘要

In the modern-day phosphor-converted light emitting diodes (pc-LEDs), white-light for general illumination is generated by combiningblue light from the InGaN chip with the yellow-green emission of Ce doped garnet phosphor and a red emitter. The red emitter is required to induce a “warm-white” color temperature (2700-3500 K). The optical properties of the red emitter are critical to achieving high luminous ef?cacy (lumens per watt or LPW) and high color rendering index (CRI) of the white light. The red emitter must display both strong absorption at 450 nm and sharp line emission in the range of 610 nm - 650 nm. Currently, the red emitter that satis?es these requirements is the K_2SiF_6:Mn~(4+) (PSF/KFS) phosphor. This review summarizes the fundamental aspects of the Mn~(4+) ion luminescence in solids, the spectroscopic properties of the Mn~(4+) ion in K_2SiF_6 and the manufacturing procedures with particular emphasis on post-synthesis processes that are required to produce phosphor with acceptable reliability. The review also discusses alternate compositions, future improvements, and challenges.