Enhancing quantum efficiency and tuning photoluminescence properties in far-red-emitting phosphor Ca14Ga10Zn6O35:Mn4+ based on chemical unit engineering

Mn4+ activated Ca14Ga10Zn6O35 (CGZO) have attracted much attention for the usages of white light-emitting-diodes (WLEDs), solar cells and plant growth LEDs. In this paper, we conducted chemical unit engineering in CGZO:Mn4+ by substituting Ge4+-M+ (M = Li, Na, K) for Ga3+-Ca2+. The impacts of Ge4+-M+ (M = Li, Na, K) substitution on the crystal structure, photoluminescence properties, quantum efficiency (QE) and thermal stability were...