Luminescence and energy transfer processes in LuNbO4:Bi, Eu

Designing stimuli-responsive and color-tunable indicators via the coexistence of dual emitting centers

“…The PLE spectra of the exhibited broad excitation bands stretching from 250 nm to 350 nm with maximums at 253 nm and 304 nm are mainly attributed to the charge transfer band from the O ligands to the central Nb atoms in the octahedrally coordinated NbO 6 groups and transitions of Bi 3+ emitting centers. 42,43 The two excitation bands partly overlap. Meanwhile, it is worth noting the shape of the excitation and emission bands of LuNbO 4 :Bi 3+ does not change with increasing contents of Bi 3+ .…”

“…Such features mainly originate from the fact that the host can effectively transfer its excitation energy to activators such as Bi 3+ , then the luminescence is significantly improved by host sensitization. 36,43,44 3.2. Coexistence of dual emitting centers in LuNbO 4 :Bi 3+ , Ln 3+ phosphors Fig.…”

Luminescence properties and energy-transfer behavior of Y2--Bi Eu MgTiO6 phosphors

“…However, the emission intensity varies noticeably. The absorption peak at about 340 nm is very weak when the doping concentration of Bi 3+ is 0.02, with the further increase of Bi 3+ doping concentration, the luminescence peak almost disappears, indicating that the 1 S→ 3 P 0 characteristic transition in Bi 3+ is significantly affected by the concentration quenching effect [ [25] , [26] , [27] ]. The illustration in Fig.…”