Near-infrared luminescence of Bi2ZnOB2O6:Nd3+/PMMA composite

Mechanism for the long afterglow in Eu2O3 and Nd2O3 co-doped SrAl2O4 single crystals

“…However, the energies of the Eu 2+ emission and the Nd 3+ excitation peak have good overlap in the visible region, 24 and the absence of any emission from Nd 3+ with other excitation wavelengths supports the proposal for energy transfer from Eu 2+ to Nd 3+ . Energy transfer from Eu 2+ to Nd 3+ has also been reported by Tai et al , 24 and this conclusion is further supported by the absence of either absorption 25 or emission 26 associated with Nd 3+ at 421 nm. The PL spectra in the near infrared region consist mainly of three groups of emission peaks, which correspond to the Nd 3+ 4 F 3/2 → 4 I 9/2 (880/907 nm), 4 F 3/2 → 4 I 11/2 (1062/1114 nm) and 4 F 3/2 → 4 I 13/2 (1332 nm) transitions.…”