Upconversion enhancement in NaYF₄:Yb³⁺, Er³⁺ crystal via Bi³⁺ doping

Recent advances and prospects of persistent luminescent materials as inner secondary self-luminous light source for photocatalytic applications

“…This, as we will discuss further, is of particular interest and importance for the MPL@PCM composites design. In addition, the up-converting optical properties of the RE ions like the Yb 3+ [183,302], Er 3+ /Yb 3+ [303], and Er 3+ /Tm 3+ /Yb 3+ [304] can sometimes be modified by Bi 3+ ion. Although the number and type of Bi 3+ MPLs are also not plentiful as compared to those RE-based MPLs, they are desirable for the photocatalytic purposes due to the broad and host-dependent persistent range (Figure 8).…”

“…These compounds are referred to the up-converted MPLs (UC-MPLs), and they are mostly activated with the 808 nm and 980 nm NIR light. In this case, to realize the UC process in UC-MPLs, it generally needs an Yb 3+ ion that efficiently absorbs the 980 nm NIR photons or an Nd 3+ ion that can absorb the 808 nm NIR photons [40,135,143,193,[302][303][304][343][344][345][346][347][348][349][350][351][352][353][354][355][356][357][358][359].…”

Optical and magnetic properties of pure and Er, Yb-doped β-NaYF4 hexagonal plates for biomedical applications

“…28-1192, a = 5.960 Å, c = 3.510 Å, Space group P63/m). A shift in diffraction peaks towards lower angle may be attributed to the substitution of ion having a larger radii [26] Yb (0.93 Å) and Er (0.89 Å) into the host lattice Y (0.82 Å), which leads to expansion of the crystal on doping (Fig. 2).…”