Abstract
Mn 2+ doped Ba 2ZnS 3 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 °C and the crystallinity of the phosphors increases with the soaking time of the thermal treatment. The Ba 2ZnS 3:Mn 2+ 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 λ 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 Mn 2+ ion. These phosphors have broad emission spectra (550–700 nm) with FWHM (full width at half maximum broadband) about 55 nm. The Ba 2ZnS 3 doped with 0.5 mol% Mn 2+ appears to have the highest luminescent intensity after thermal treatment at 950 °C for 16 h and the CIE coordinate is x = 0.632, y = 0.368.
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