Jiahua Zhang

Competitionbetween Two Upconversion Mechanisms forRed Emission in Er3+ and Yb3+ Codoped Rare-EarthSesquioxides

Abstract Er3+/Yb3+ codoped rare-earth sesquioxides are widely used red upconversion (UC) phosphors under near-infrared (NIR) 980 nm excitation. Besides the old mechanism, a newly identified round-trip energy transfer (RTET) between Er3+ and Yb3+ accelerates relaxation from the gr...