Tunable blue–green–emitting Na4CaSi3O9:Ce3+, Li+, Tb3+ phosphor with energy transfer for near-UV white LEDs. (September 2020) - Miao, S.
Abstract: Phosphor-converted white light emitting diodes ( w -LEDs), with high luminous efficiency, low energy consumption, extended lifetime, and eco-friendly nature, have revolutionized various industries. Among them, an alkaline earth silicate-based phosphor host, Na4 CaSi3 O9, shows good crystal structure stability and flexible properties for diverse application. Here, Ce 3+ /Li + singly doped and Ce 3+ /Li + /Tb 3+ co-doped Na4 CaSi3 O9 phosphors are fabricated by the standard solid-state reaction approach. The Ce 3+ /Li + -activated phosphors show strong absorption within 200–400 nm and exhibit a blue emission centered at 423 nm. The quenching concentration of Ce 3+ appears at x = 0.05 and can be attributed to the dipole–quadrupole interaction. When Tb 3+ ions are co-doped, the Na4 CaSi3 O9 :Ce 3+, Li +, Tb 3+ phosphor emission can be adjusted from blue to green under the irradiation of 365 nm through the dipole–dipole interaction induced energy transfer from Ce 3+ to Tb 3+ ions with a maximum value of 28.32%. This study highlights the Na4 CaSi3 O9 :Ce 3+, Li +, Tb 3+ phosphors as a new and efficient material for w -LED applications. Highlights: Ce 3+ /Li + singly doped and Ce 3+ /Li + /Tb 3+ co-doped Na4 CaSi3 O9 phosphors are fabricated by the standard solid-state reaction approach. The Na4 CaSi3 O9 :Ce 3+, Li +, Tb 3+ phosphor emission can be adjusted from blue to green under the irradiation of 365 nm through the dipole–dipole interaction induced energy transfer from Ce 3+ to Tb 3+ ions with a maximum value of 28.32%. This study highlights the Na4 CaSi3 O9 :Ce 3+, Li +, Tb 3+ phosphors as a new and efficient material for w -LED applications.