Investigation of luminescence properties and the energy transfer mechanism of Li₆Lu(BO₃)₃:Ce³⁺, Tb³⁺ green-emitting phosphors

Abstract

Novel green-emitting phosphor – Li6Lu(BO3)3:Ce3+, Tb3+ phosphors exhibit intense green emission via the energy transfer from Ce3+ to Tb3+. The data demonstrated that the phosphor is a promising green-emitting phosphor for UV LED applications.

Composition Control in Molecular Cluster-Aggregates: A Toolbox for Optical Output Tunability via Energy Transfer Pathways

“…Therefore, the position of this Yb-based LMCT state, right between Eu III 5 D 0 and Tb III 5 D 4 , leads to a higher probability of Eu III → LMCT → Tb III energy migration, a process in which the LMCT state acts as a bridge (Figure S35). Regarding the Ce-doped MCA boost of Tb III emission, although Ce III is well-known for presenting 4 f 1 → 4 f 0 5 d 1 transitions under UV excitation, − from which a hypothetical Ce III → Tb III ET could take place, the excitation spectra collected does not show any suggestion that this could be happening in our system (Figure S6A). In this case, we propose that the enhancement of Tb III emission bands happens due to the match between Ce III 2 F 7/2 and 2 F 5/2 energy level gap (≈3300 cm –1 ) and the energy difference between the emitting levels of Tb III and Eu III (≈3000 cm –1 ) (Figure F).…”