Enhancing and tuning broadband near-infrared (NIR) photoluminescence properties in Cr 3+ -doped Ca 2 YHf 2 Al 3 O 12 garnet phosphors via Ce 3+ /Yb 3+ -codoping for LED applications

NIR emission from 650 nm to 1100 nm in a novel Ca 2 YHf 2 Al 3 O 12 :Cr 3+ ,Yb 3+ garnet phosphor with good thermal stability and high internal quantum efficiency is designed for NIR pc-LEDs.