Photo-/cathodoluminescence and energy transfer properties of novel Ce3+ singly doped and Ce3+/Tb3+ codoped NaBaScSi2O7 phosphors

摘要

A series of novel Ce3+ singly doped and Ce3+/Tb3+ codoped color -tunable NaBaScSi2O7 phosphors were synthesized via the solid state method. The morphology, UV-vis reflectance, photoluminescence emission and excitation spectra, the Lifetime and the thermal quenching properties were investigated in detaiL. NaBaScSi2O7:Ce3+ phosphors showed intense bLue emission at about 425 nm, corresponding to the transitions from the Lowest 5d excited state to the F-2(5/2) and F-2(7/2) spin orbit 4f ground states of Ce3+ ions, under optimal excitation of 349 nm. Under excitation of Ce3+ ions at 349 nm, the emission spectra of NaBaScSi2O7:Ce-3,Tb3+ phosphors consisted of a bLue emission band of Ce3+ ions at 425 nm and a series of strong green emission Lines at 488, 542, 582, and 625 nm due to the D-5(4) -> F-7(3) (J = 6, 5, 4, and 3) characteristic transitions of Tb3+ ions. A possible energy transfer mechanism was proposed and ascribed to the dipole-dipole interaction on the basis of the experimental resuLts and analysis. In addition, the cathodoLuminescence properties of NaBaScSi207:Ce3,Tb3+ were also studied in detaiL. The current resuLts indicate that NaBaScSi2O7:Ce-3,Tb3+ can serve as a potential phosphor for application in UV-WLEDs and FEDs.