NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2018, 9 (4), P. 507–512
An effective nanostructured green phosphor Zn2SiO4:Mn2+ prepared by solgel method
K. A. Sergeeva – Ural Federal University, Mira, 19, Ekaterinburg, 620002, Russia; firstname.lastname@example.org
A. A. Sergeev – Far-Easten Federal University, Sukhanova, 8, Vladivostok, 690091, Russia
A. A. Rempel – Ural Federal University, Mira, 19, Ekaterinburg, 620002; Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences, Amundsena, 101, Ekaterinburg, 620016, Russia
A nanostructured willemite doped with manganese (Zn2SiO4:Mn2+) was synthesized by sol-gel method followed by high-temperature annealing. Prepared Zn2SiO4:Mn2+ is characterized by average particle size of 100 nm, narrow particle size distribution, and high crystallinity. Under UV-excitation nanostructured willemite shows an intensive photoluminescence at 520 nm corresponded to activator Mn2+ emission. It was found that the emission decay curves of willemite becomes non-exponential with increasing of manganese content. Zn2SiO4:Mn2+ reveals long-lasting phosphorescence up to 45 ms. Absolute quantum yield of Zn2SiO4:Mn2+ reaches 47 % at 0.1 at. % of Mn2+. The luminescence concentration quenching effect at Mn2+ concentration higher than 1 at % is observed.
Keywords: willemite, manganese, photoluminescence, quantum yield.
PACS 78.55.-m, 81.20-n