Title
Crystal-site engineering approach for preparation of Mg B2O4:Mn2+, Mn4+ (B = Al, Ga) phosphors: control of green/red luminescence properties
Author
Yoshinori Wakui, Yue Jin Shan, Keitaro Tezuka, Hideo Imoto, Mariko Ando
Year
2017
Journal
Materials Research Bulletin
Abstract
The luminescence color (green/red) of Mg B2O4:Mn (B = Al, Ga) phosphors was controlled by crystal-site engineering approach through adjusting the quantity of MgO in raw materials. Though the stoichiometric samples (Mg/B = 1:2) indicated both green and red luminescence, the samples prepared with deficient-MgO and excess-MgO showed only green and red emission, respectively. The green and red luminescence were caused by Mn2+ in tetrahedral A-site and Mn4+ in octahedral B-site. The excess-MgO suppressed the substitution of Mn2+ dopant for Mg2+ in tetrahedral A-site and also acted as charge compensation agent for Mn4+ which replaced the B3+ ion (B = Al, Ga). We proposed the mechanism of green/red luminescence in Mn-doped Mg B2O4 (B = Al, Ga) phosphors with several Mg quantities.
Instrument
FP-6500
Keywords
Fluorescence, Photoluminescence, Materials, Solid state