Blue-green tunable color of Ce3+/Tb3+ coactivated NaBa3La3Si6O20 phosphor via energy transfer

Abstract

A series of color tunable phosphors NaBa3La3Si6O20:Ce3+, Tb3+ were synthesized via the high-temperature solid-state method. NaBa3La3Si6O20 crystallizes in noncentrosymmetric space group Ama2 with the cell parameters of a = 14.9226(4) Å, b = 24.5215(5) Å and c = 5.6241(2) Å by the Rietveld refinement method. The Ce3+ ions doped NaBa3La3Si6O20 phosphors have a strong absorption band from 260 to 360 nm and show near ultraviolet emission light centered at 378 nm. The Ce3+ and Tb3+ ions coactivated phosphors exhibit color tunable emission light from deep blue to green by adjusting the concentration of the Tb3+ ions. An energy transfer of Ce3+ → Tb3+ investigated by the photoluminescence properties and lifetime decay, is demonstrated to be dipole–quadrupole interaction. These results indicate the NaBa3La3Si6O20:Ce3+, Tb3+ phosphors can be considered as potential candidates for blue-green components for white light emitting diodes.

Luminescence Properties of Ca19Ce(PO4)14:A (A = Eu3+/Tb3+/Mn2+) Phosphors with Abundant Colors: Abnormal Coexistence of Ce4+/3+–Eu3+ and Energy Transfer of Ce3+ → Tb3+/Mn2+ and Tb3+–Mn2+

“…Different from Eu 3+ ions, an effective ET can occur between Ce 3+ and Tb 3+ /Mn 2+ , which has been reported in many Ce 3+ - and Tb 3+ /Mn 2+ -codoped phosphors, such as NaBa 3 La 3 Si 6 O 20 :Ce 3+ ,Tb 3+ , Ca 3 Y­(GaO) 3 (BO 3 ) 4 :Ce 3+ ,Tb 3+ ,Mn 2+ , Y 2 SiO 5 :Ce 3+ ,Tb 3+ , and CaSr 2 Al 2 O 6 :Ce 3+ ,Mn 2+ . So, we doped Tb 3+ and Mn 2+ ions into the CCPO host lattice in our experiment.…”

Photon avalanche assisted upconversionviacustomizing the green emission

“…This implied that the concentration quenching of Ho 3+ ions in the SnWO 4 phosphors is caused by electric dipolequadrupole interaction. 53,61 However, by considering the concentration of Mn 4+ ions, the energy transfer process from Ho 3+ to Mn 4+ can be identied. The found value of R c is 3.2 Å, which is less than 5 Å.…”

Morphology and optical properties of wet chemistry synthesized submicron CePO4:Tb3+ hollow spheres

“…Tb 3+ energy levels were compatible with energy transfered from the allowed absorption on Ce 3+ ion upon excitation with an UV source. The green emission transition ( 5 D4-7 F5) at ~ 543 nm was considerd as the magnetic dipole transition with ΔJ = ±1 with more intense than other transitions [22][23][24][25]. The emission characteristic of CePO4:Tb 3+ hollow spheres was investigated through the photoluminescence emission (PL) spectrum as shown in Figure 7.…”