LAUSR

A narrow-band red emission is a seminal issue for establishing the color-rendering index and color gamut of phosphor-converted white light emitting diode (pc-WLED) applications. In this regard, Mn4+-activated K2SiF6 phosphors (referred to as K216) have recently attracted a great deal of attention after their successful commercialization. As with K216 phosphors, Mn4+-activated K3SiF7 (referred to as K317) phosphors perform in a manner that is similar to that of K216 phosphors and have been introduced as a narrow-band red phosphor. Despite the acceptable performances of both versions of phosphors, slower decay remains a shortcoming for applications to high-powered LEDs. We introduced K317 derivatives by replacing K with Rb and Cs. As a result, Mn4+-activated (Rb,Cs)3SiF7 phosphors were synthesized with different Rb:Cs ratios and exhibited faster decay times by comparison with both the K216 and the K317 phosphors. The present study involved both structural and luminescent investigations along with density fu...