The impacts of green LaBSiO5: Tb3+, Ce3+ phosphor on lumen output of white LEDs

Ha Thanh Tung (Vinh Long University of Technology Education)
Huu Phuc Dang (Industrial University of Ho Chi Minh City)
Phung Ton That (Industrial University of Ho Chi Minh City)

Bulletin of Electrical Engineering and Informatics
Vol 12, No 3: June 2023

The traditional solid-state technique was used to create LaBSiO5 phosphors doped with Ce3+ and Tb3+ at 1,100 °C. These phosphors' phase purity and luminous characteristics are looked at. Under ultraviolet (UV) light stimulation, LaBSiO5: Tb3+ phosphors emit bright green light, whereas LaBSiO5 samples incorporated with Ce3+ emit blue-violet light. With UV ray stimulation, LaBSiO5 samples incorporated with Ce3+ as well as Tb3+ emit blue-violet as well as green illumination. The 5d-4f shift for Ce3+ is responsible for the blue-violet radiation, while the 5D4→7F5 transition of Tb3+ is responsible for the green radiation. The mechanism for power conversion between Ce3+ and Tb3+ was examined since there is a spectral overlap among the stimulation line for Tb3+ and the emitting line for Ce3+.