Novel Broadband Excited and Linear Red-Emitting Ba_2Y(BO_3)_2Cl: Ce~(3+), Tb~(3+), Eu~(3+) Phosphor: Luminescence and Energy Transfer

摘要

A series of Ce~(3+), Tb~(3+), Eu~(3+) tri-doped Ba_2Y(BO_3)_2Cl red-emitting phosphor have been synthesized by solid-state method. The Ce~(3+)→Tb~(3+) → Eu~(3+) energy-transfer scheme has been proposed to realize the sensitization of Eu~(3+) ion emission by Ce~(3+) ions. Following this energy-transfer model, near-UV convertible Eu~(3+)-activated red phosphors have been obtained in Ba_2Y(BO_3)_2Cl: Ce~(3+), Tb~(3+), Eu~(3+) phosphors. Energy transfers from Ce~(3+) to Tb~(3+), and Tb~(3+) to Eu~(3+), as well as corresponding energy-transfer efficiencies are investigated. The combination of narrow-line red emission and near-UV broadband excitation makes Ba_2Y(BO_3)_2Cl: Ce~(3+), Tb~(3+), Eu~(3+) as a novel and efficient red phosphor for NUV LED applications.