Abstract:A series of red-orange luminescent Y2-2xMgTiO6:2xSm3+( YMT: 2xSm3+, 0≤ x ≤0.11) phosphors were synthesized by sol-gel method. The samples were characterized and analyzed by powder X-ray diffractometer (XRD), scanning electron microscopy (SEM), photoluminescence excitation and emission spectroscopy. XRD show that the as-prepared YMT: Sm3+exhibit apure-phasestructure with no impurityphases. The SEM images show an average diameter of about 2-3μm for the particlesand good dispersibilitywithoutovert agglomerationphenomenon.Underthe excitation of a407nmnear-ultravioletlight, the emission spectrum of YMT: Sm3+ phosphors has three significant emission peaks in the wavelength range of 500-700nm, of which 603nm (4G5/2→6H7/2) Corresponding to the extremely strong orange-red light emission, the other two weaker emission peaks are at 569nm (4G5/2→6H5/2) and 650nm (4G5/2→6H9/2), respectively. The optimal doping concentration of Sm3+ ions is about 5 mol%, and the theoretically calculated critical transfer distance of Sm3+ ions is 1.619 nm. When the concentration of Sm3+ exceeds 5 mol%, there is an obvious concentration quenching effect, which is attributed to the electric quadrupole electric quadrupole (q-q) interaction between Sm3+ ions.The CIE chromaticity coordinates of YMT: Sm3+ phosphors are located in the orange-red region, indicating that it has potential application value in red phosphors for white LEDs.
