Preparation and properties of rare-earth silicate phosphor research

Title: Preparation and properties of rare-earth silicate phosphor research
Author: Chen Zhenmin
Degree-granting units: Beijing Jiaotong University
Keywords: portland;; a single matrix;; dysprosium ion;; europium ion;; solid state lighting;; white LED
Summary:
Silicate matrix has good chemical stability and thermal stability, a long time people have paid attention to the silicate matrix phosphor research and development. White phosphor matrix with a single lumen for high efficiency and good color reproduction characteristics, so the significance of their research.
In this paper, high-temperature solid-phase synthesis of M2SiO4: Dy3, Eu3 (M = Mg, Ca) series LED with a phosphor, and the structural characteristics Strong magnets of the sample and the corresponding near-UV excitation of the luminescence properties are studied.
Series of samples M2SiO4: Dy3, Eu3 (M = Mg, Ca) X-ray powder diffraction data with the JCPDS standard cards are in good agreement, suggesting that our synthetic material is alkaline earth metal silicate, silicate system is working.
In the spectrum of the phosphor doped Dy3 can see, the sample absorption at 325nm, 350nm, 365nm and 386nm near, corresponding to the Dy3 ion 6H15 / 2 → 6P3 / 2,6 H15 / 2 → 6P7 / 2,6 H15 / 2 → 6P5 / 2,6 H15 / 2 → 4M21 / 2 transitions. The use of 386nm UV excitation, located in 480nm, 492nm, 575nm emission near the peak corresponding to the Dy3 ion 4F9 / 2 → 6H15 / 2 transitions, 579nm corresponding to the Dy3 ion 4F9 / 2 → 6H13 / 2 emission transition.
Prepared Dy3, Eu3 doped samples, the spectrum of its shows a marked increase in red light district in addition to the orange emission light 590nm, red light 616nm, 653nm, 704nm at the launch, more than are the 5D0 → 7FJ Eu3 (J = 1,2,3,4) transition http://www.chinamagnets.biz/ emission energy levels. Adding rare earth ions Eu3 luminescence of samples corresponding to the color coordinates and color temperature greater impact.
Synthesis and analysis of the binary system samples of alkaline earth metal cations (MgxCa1-x) 2SiO4: Dy3, Eu3 UV spectral characteristics, the proportion of the alkaline-earth ions in different spectra and color coordinates of the impact.
Figure 23 in this paper, Table 8, reference 45.
Degree Year: 2010