文摘
A new orange-yellow-emitting Sr9Mg1.5(PO4)7:Eu2+ phosphor was prepared via high-temperature solid-state reaction. The structure and optical properties of it were studied systematically. Sr9Mg1.5(PO4)7:Eu2+ can be well-excited by 460 nm blue InGaN chips and exhibit a wide emission band covering from 470 to 850 nm with two main peaks centered at 523 and 620 nm, respectively, which originate from 5d鈥?f dipole-allowed transitions of Eu2+ in different crystallographic sites. The sites attribution, concentration quenching, fluorescence decay analysis, and temperature-dependent luminescence properties were investigated in detail. Furthermore, a warm white LED device was fabricated by combining a 460 nm blue InGaN chip with the optimized orange-yellow-emitting Sr9Mg1.5(PO4)7:Eu2+. The color coordinate, correlated color temperature and color rendering index of the fabricated LED device were (0.393, 0.352), 3437 K, and 86.07, respectively. Sr9Mg1.5(PO4)7:Eu2+ has great potential to serve as an attractive candidate in the application of blue light-excited warm white LEDs.