Glass-ceramics with Yb, Tm:YNbO4 nanocrystals: Novel NIR-to-NIR upconversion phosphor

摘要

Transparent lithium alumosilicate glass-ceramics containing nanosized (8-15 nm) crystals of rare-earth orthoniobates, Yb, Tm:YNbO4, and β-quartz solid solutions are synthesized. Under the near-IR excitation by an InGaAs diode, they demonstrate intense near-IR upconversion luminescence at ~800 nm. The efficiency of Yb3+ →Tm3+ energy transfer is ~90%.