Photoluminescent properties of Ba2ZnS3:Mn phosphors

• Published in: Journal of alloys and compounds Vol. 421; no. 1-2; pp. 268 - 272
• Main Authors: LIN, Yu-Feng, CHANG, Yen-Hwei, CHANG, Yee-Shin, TSAI, Bin-Siang, LI, Yu-Chun
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier 14.09.2006
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other solid inorganic materials; Photoluminescence; Physics; Zinc sulfides; Impurity density; Semiconductors; Doping; Photoluminescence; Luminescence; Manganese additions; XRD; Heat treatments; Luminescence decay; Barium sulfides; Phosphors; Solid state reaction; Orthorhombic lattices; Solid-state reaction; Absorption spectra
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2005.11.038

Mn2+ doped Ba2ZnS3 phosphor powders have been synthesized via the conventional solid-state reaction by the double-crucible method with ethanol as the reducing agent. XRD results indicate that the raw materials are completely sulfurized above 950 deg C and the crystallinity of the phosphors increases with the soaking time of the thermal treatment. The Ba2ZnS3:Mn2+ powders possess an orthorhombic crystal structure with doping concentration from 0 to 0.9 mol%. The photoluminescence (PL) spectra show that the emission peaks are at 611 nm (under excitation at lambda(ex) = 358 nm) independent of doping concentration. The high-luminance reddish orange emission results from the 4T(1) (4G)-6A(1) (6S) transition in the Mn2+ ion. These phosphors have broad emission spectra (550-700 nm) with FWHM (full width at half maximum broadband) about 55 nm. The Ba2ZnS3 doped with 0.5 mol% Mn2+ appears to have the highest luminescent intensity after thermal treatment at 950 deg C for 16 h and the CIE coordinate is x = 0.632, y = 0.368.