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Synthesis and photoluminescence of perovskite-type Ca2MgWO6: Eu3+ micrometer phosphor

F. LEI1, B. YAN1,*

Affiliation

  1. Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, China

Abstract

Red micrometer phosphor Ca2MgWO6: Eu3+ with double perovskite structure has been synthesized via conventional solid-state reaction of stoichiometric amounts of CaCO3, WO3, MgO and Eu2O3, which is characterized by powder X-ray diffraction (XRD), Scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), thermogravimetry - differential scanning calorimeter (TG-DSC) and Fourier transform infrared spectroscopy (FT-IR). At room temperature, the crystal structure of Ca2MgWO6: Eu3+ is orthorhombic, space group Pmm2, with lattice parameters a = 7.715 Å, b = 5.413 Å, c = 5.549 Å. The structure contains alternating MgO6 and WO6 octahedra. TG-DSC measurements as a functional of temperature indicate a structural transition and crystallization temperature. The TG-DSC curve is agree well with the theoretical value, the mass loss within the temperature ranging from 600 ~ 800 ℃ is associated with the decomposition of CaCO3, and the crystallization temperature is at 1224 ℃. The UV-vis DRS shows that the absorption band in the 200 ~ 350 nm is the charge transfer transition of tungstate group. The photoluminescent spectrum (PL) and lifetime are discussed in details. The emission spectrum includes 5D0 → 7FJ (J = 1, 2, 3 and 4) emissions appearing at 535, 613, 651 and 700 nm, respectively. The peak at 613 nm is dominant, since Eu3+ is at a site lack of inversion symmetry (S4), the blue band emissions peaking at 465 and 487 nm were the charge transfer state of WO6 6- group. Especially the lifetimes and quantum efficiency are estimated..

Keywords

Tungstate, Ca2MgWO6: Eu3+, Double perovskite structure, A2B’B”O6, Photoluminescence.

Submitted at: Dec. 1, 2007
Accepted at: Jan. 18, 2008

Citation

F. LEI, B. YAN, Synthesis and photoluminescence of perovskite-type Ca2MgWO6: Eu3+ micrometer phosphor, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 1, pp. 158-163 (2008)