Optical spectroscopy of theNi2+-doped layer perovskitesRb2MCl4(M=Cd,Mn):Effects ofNi2+−Mn2+exchange interactions on theNi2+absorption, luminescence, and upconversion properties

Optical spectroscopy of theNi2+-doped layer perovskitesRb2MCl4(M=Cd,Mn):Effects ofNi2+−Mn2+exchange interactions on theNi2+absorption, luminescence, and upconversion properties