On the excitation spectra of Cr3+/Cr2+ and V3+ co-doped ZnAl2S4 single crystals

A ratiometric luminescence pH sensor based on YAG:V3+,V5+ nanoparticles

“…Correspondingly, they are attributed to the O 2À -V 5+ ligand-metal charge transfer (LMCT) and 3 T 1g ( 3 F) -3 A 1g1 ( 3 F) d-d electronic transitions. 58 Aiming at verifying the optical response of YAG:V 3+ , V 5+ phosphors to pH changes, their emission spectra were measured in the pH range from 1 to 12 upon l exc = 266 nm excitation at room temperature (Fig. 4(a) and (b)).…”

“…Correspondingly, they are attributed to the O 2− → V 5+ ligand–metal charge transfer (LMCT) and 3 T 1g ( 3 F) → 3 A 1g1 ( 3 F) d–d electronic transitions. 58…”