Abstract
Mn4+- and Mn2+-activated red and yellowish-green phosphors have been synthesized by the wet chemical etching of Si wafers in aqueous HF/NaMnO4 · H2O and HF/Na2Cr2O7 · 2H2O/Mn solutions, respectively. X-ray diffraction patterns suggest that the synthesized powders are Na2SiF6:Mn4+ and Na2SiF6:Mn2+ with a trigonal structure (space group = D32-P321). Photoluminescence (PL) analysis, PL excitation (PLE) spectroscopy, and diffuse reflectance measurements were carried out to investigate the optical properties of the phosphors. Franck-Condon analyses of the PL and PLE spectra were performed to determine the zero-phonon energies of the Mn4+- and Mn2+-related transitions in Na2SiF6. Temperature-dependent PL and luminescence decay time measurements were performed from 20 to 300 K, and the obtained results are explained on the basis of the energy level diagram of the 3d3 (Mn4+) and 3d5(Mn2+) electrons in Na2SiF6, taking into account the thermal quenching effect. Electron spin resonance measurements were also performed. This is the first reported synthesis of a yellowish-green phosphor using Na2XF6 (X = a tetravalent metallic ion) as the host crystal.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
