Time-resolved luminescence of Fe 3+ and Mn 2+ ions in hydrous volcanic glasses

Optical properties of sol–gel fabricated Mn/SiO2 nanocomposites: Observation of surface plasmon resonance in Mn nanoparticles

“…According to Refs. [13][14][15][16][17] Mn 2+ ions cause the characteristic absorption and photoluminescence bands in the visible spectral range, and J 2 -J 4 bands correspond to the light absorption by Mn 2+ ions in silica matrix in tetrahedral coordination and J 5 band corresponds to light absorption in Mn 2+ ions in silica matrix in octahedral coordination. According to Ref.…”

“…[7][8][9][10]. There exist many works reporting the optical properties of Mn containing nanocomposites [11][12][13][14][15][16][17]. The optical properties of such Mn containing nanocomposites are determined by optical transitions in manganese ions and oxides.…”

Conversion of Valence State and Coordination State of Fe in Transparent Glass‐Ceramics ContainingLi2ZnSiO4Nanocrystals

“…For high‐transmittance materials, Fe 2+ ions in octahedral coordination (Fe 2+ :Oh) are regarded as unfavorable impurity ions because of intense absorption in the NIR region . On the other hand, Fe 3+ ions in tetrahedral coordination (Fe 3+ :Td) were found to be red luminescent centers in some silicate or phosphate glasses . However, in these reports, the PL efficiency is still too low because of coexistence of Fe 2+ and Fe 3+ valence states as well as mixture of tetrahedral and octahedral coordination states of Fe ions.…”

Local structure and medium range ordering of tetrahedrally coordinated Fe3+ ions in alkali–alkaline earth–silica glasses

“…The mixed coordination of Fe 3+ ions in glass has provoked extensive debate. There is broad agreement that tetrahedral and octahedral Fe 3+ ions may coexist in many silicate glasses, but with the majority of Fe 3+ ions being tetrahedrally coordinated [1,8,14,17,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Recent molecular dynamic simulations have also suggested the existence of five-coordinated Fe 3+ species [46], but the possible existence of such species in silicate glasses has received little support to date from spectroscopic data.…”

“…Luminescence studies of Fe 3+ ions in oxide glass systems have included volcanic aluminosilicates [26] sodium and calcium phosphates [16], borosilicates [27], sodium silicates [14], lithium silicates [28] and sodium and potassium aluminosilicates [17]. In these host materials, the 4 T 1 (G) !…”