Crystal-site engineering approach for preparation of Mg B2O4:Mn2+, Mn4+ (B = Al, Ga) phosphors: Control of green/red luminescence properties. (June 2017)

• Record Type: Journal Article
• Authors: Wakui, Yoshinori; Shan, Yue Jin; Tezuka, Keitaro; Imoto, Hideo; Ando, Mariko
• Is Part Of: Materials research bulletin. Volume 90(2017)
• Page Start: 51
• Page End: 58
• Publication Date: 2017-06
• Subjects: Crystal-site engineering -- Photoluminescence -- Mn dopant (Mn2+, Mn4+) -- Spinel oxide -- ESR; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2017.02.001
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: The luminescence color (green/red) of Mg B 2 O4 :Mn ( B = Al, Ga) phosphors was controlled by crystal-site engineering approach through adjusting the quantity of MgO in raw materials. Digital photos of Mg x B 2 O4 :Mn ( B = Al, Ga) phosphors with different Mg quantity ( x ) under 254 nm or 365 nm (for x = 1.5) UV light excitation. (a) Mg x Al2 O4 :Mn 0.1 mol%, (b) Mg x Ga2 O4 :Mn 0.05 mol%. Highlights: The luminescence color of Mg B 2 O4 :Mn ( B = Al, Ga) was controlled by crystal-site engineering approach. The samples prepared through adjusting the quantity of MgO in raw materials. The samples with deficient-MgO and excess-MgO showed only green and red emission. The stoichiometric samples (Mg/ B = 1:2) indicated both green and red luminescence. We proposed the mechanism of green/red luminescence in Mn-doped Mg B 2 O4 ( B = Al, Ga) phosphors. Abstract: The luminescence color (green/red) of Mg B 2 O4 :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 Mn 2+ in tetrahedral A -site and Mn 4+ in octahedral B -site. The excess-MgO suppressed the substitution of Mn 2+ dopant for Mg 2+ in tetrahedral A -site and also acted as charge compensation agent for Mn 4+ which replaced the B 3+ ion ( B = Al, Ga). We proposed the mechanism of green/red luminescence in Mn-doped Mg B 2 O4 ( B = Al, Ga) phosphors with several Mg quantities.