Oxygen fluoride aluminosilicate white powders on conversion and spectral properties of

Title: Oxygen fluoride aluminosilicate white powders on conversion and spectral properties of
　　Author: Wu Qin
　　Degree-granting unit: Dalian Maritime University
　　Keywords: white;; conversion;; cross-relaxation;; oxyfluoride
　　Summary:
　　This article was prepared by solid-phase of a new substrate materials: fluorine oxygen aluminosilicate (44SiO2-28Al2O3-17NaF-11YF3) double-doped Yb3, Ho3; Yb3, Er3; Yb3, Tm3 and three trichromatic phosphors doped Yb3 , Tm3, Ho3; Yb3, Tm3, Er3 white powder.
　　In Yb3, Ho3 system, green (541nm), red (648nm) Magnetic lifter are attributed to Ho3 ion 5S2 (5F4) → 5I8 and 5F5 → 5I8 level transition. In Yb3, Er3 system, green (521nm, 540nm) and red (668nm) are attributed to Er3 ions 4S3 / 2 (2H11 / 2) → 4I15 / 2 and 4F9 / 2 → 4I15 / 2 transition energy levels . In Yb3, Tm3 system, blue (480nm) and red (648nm) are attributed to the 1G4 → 3H6 Tm3 ions and the energy levels of IG4 → 3F4 transition. Research of rare earth ion concentration on the luminescence of the three discussed the upconversion mechanism. Combined analysis of light-emitting mechanism in double-doped yb3, Er3 system, effects of rare earth ions due to join the energy transfer process is cross reasons for the higher doping concentration.
　　In the three doped system, the study of rare earth ion concentration on the luminescence properties, focused on two systems, and energy transfer upconversion process mechanism. Single near-infrared (980nm) laser diode matrix to achieve the same emission blue, green and red visible light, but also by adjusting the concentration of the doped rare earth ions to control the three primary colors of the emission intensity. Three doped Yb3, Tm3, Ho3 best sample W1 at a certain pump power under CIE1931 color coordinates (x = 0.337, y = 0.338) with the same amount of white light very close to the correlated color temperature of 5288K. However, Yb3, Tm3, Er3 three doped system can not achieve the same effect, and the best samples of W2's CIE1931 color coordinates (x = 0.231, y = 0.387), deviate from the white zone. Two systems in common, that is: with the pump power increases, the color coordinates are moving to the blue area. At the same time by analyzing http://www.999magnet.com/products/131-magnetic-lifter the light intensity output of two systems with the pump power of double logarithmic curve, Blu-ray emission are found in three-photon process, green and red emission belong to the two-photon process. The results showed that: In addition to Yb3 ion as a sensitizer of energy transfer outside, Tm3 ions with Ho3 / Er3 ions also cross-relaxation energy transfer, sensitized Ho3, Er3 luminescence.
　　In addition, X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR) characterization of the white sample (W1). XRD showed that the samples for the oxyfluoride phase, SEM shows the particle agglomeration more severe, with only a small amount of dispersed particles, between 1μm-5μm in size. For the three doped upconversion system has shown potential.
　　Degree Year: 2010