Synthesis and luminescence of β-SrGe（PO₄）₂:RE(RE=Eu²⁺,Eu³⁺,Tb³⁺) phosphors for UV light-emitting diodes

【摘要】 A new series of β-Sr Ge（PO₄）₂:RE(RE=Eu²⁺,Eu³⁺,Tb³⁺) phosphors were synthesized and characterized by using X-ray powder diffraction as well as excitation, and emission spectroscopy. The results exhibited that the singly doping Eu2+, Tb³⁺ and Eu³⁺ of β-Sr Ge（PO₄）₂ emit strong blue, green and red light under UV irradiation, respectively. Based on the charge transfer transitions of O^2–→RE³⁺, an overlapping excitation band of the as-obtained phosphors could be found in UV region, which made β-Sr Ge（PO₄）₂:RE(RE=Eu²⁺,Eu³⁺,Tb³⁺) serve as a new series of RGB phosphors. Meanwhile, these phosphors could also be excited by 380 nm excitation simultaneously, and hence the three phosphors mixed physically could achieve the tunable hues from blue to white region by adjusting the mixed ratios.更多还原

【Abstract】 A new series of β-Sr Ge（PO₄）₂:RE(RE=Eu²⁺,Eu³⁺,Tb³⁺) phosphors were synthesized and characterized by using X-ray powder diffraction as well as excitation, and emission spectroscopy. The results exhibited that the singly doping Eu2+, Tb³⁺ and Eu³⁺ of β-Sr Ge（PO₄）₂ emit strong blue, green and red light under UV irradiation, respectively. Based on the charge transfer transitions of O^2–→RE³⁺, an overlapping excitation band of the as-obtained phosphors could be found in UV region, which made β-Sr Ge（PO₄）₂:RE(RE=Eu²⁺,Eu³⁺,Tb³⁺) serve as a new series of RGB phosphors. Meanwhile, these phosphors could also be excited by 380 nm excitation simultaneously, and hence the three phosphors mixed physically could achieve the tunable hues from blue to white region by adjusting the mixed ratios.更多还原