Effects of flux on the luminescence of MgGa2O4:Mn2+ phosphors. (December 2017)

• Record Type: Journal Article
• Authors: Ahn, Wonsik; Im, Minhyuk; Kim, Young Jin
• Is Part Of: Materials research bulletin. Volume 96:Part 3(2017)
• Page Start: 254
• Page End: 257
• Publication Date: 2017-12
• Subjects: Ceramics -- Optical materials -- Luminescence -- Phosphors; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2017.02.030
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Effects of H2 BO3 and MgF2 fluxes on the luminescence of MgGa2 O4 :Mn 2+ were studied. Flux effects were explained considering the crystallinity and particle size. H2 BO3 significantly enhanced the emission intensity, whereas MgF2 did not. Mn 2+ concentration affected the charge transfer band and the emission intensity. Abstract: The effects of H3 BO3 and MgF2 fluxes on the crystal structure and photoluminescence (PL) of MgGa2 O4 :Mn 2+ phosphors were investigated. The PL excitation spectra of the powders consisted of intensive broad bands (∼290 nm), and sharp peaks at longer wavelengths. The former could be attributed to charge transfer between the Mn 2+ and O 2− ions, referred to as charge transfer band (CTB), while the latter was attributed to the d–d transitions of Mn 2+ ions. Under CTB excitation, the PL spectra exhibited green emission peaks at 505 nm, assignable to the 4 T1 ( 4 G) → 6 A1 ( 6 S) transition of Mn 2+ ions in tetrahedral sites. Compared to MgF2, H3 BO3 was more favorable for phase formation, higher crystallinity, and particle size enlargement, thus resulting in a significant enhancement in the emission intensity. The Mn 2+ concentration affected the CTB and the crystal structure; the strongest emission intensity was observed for a high Mn 2+ concentration of 0.5 mol%.