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

Abstract

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⁺.