Influence of vanadium concentration on up-conversion luminescence in Er3+–Yb3+ and Tm3+–Yb3+ ions pair co-doped YVxP1−xO4 solid state solution. - Wujczyk, Marta; Watras, Adam; Szyszka, Katarzyna; Wiglusz, Rafal J. (Journal of Alloys & Compounds, 2021)