Deep‐red photoluminescence and long persistent luminescence in double perovstkite‐type La₂MgGeO₆:Mn⁴⁺

Abstract

A novel non-rare-earth doped phosphor La 2 MgGeO 6 :Mn 4+ (LMG:Mn 4+ ) with near-infrared (NIR) long persistent luminescence (LPL) was successfully synthesized by solid-state reaction. The phosphors can be effectively excited using ultraviolet light, followed by a sharp deep-red emission peaking at 708 nm, which is originated from 2 E g ? 4 A 2g transition of Mn 4+ ions. The luminescent performance was analyzed by photoluminescence (PL) and photoluminescence excitation (PLE) spectra. The crystal field parameters were calculated to describe the environment of Mn 4+ in LMG host. The LPL behaviors as well as the mechanisms were systematically discussed. This study suggests that the phosphors will broaden new horizons in designing and fabricating novel NIR long phosphorescent materials.

Facile Synthesis of Mn4+-Activated Double Perovskite Germanate Phosphors with Near-Infrared Persistent Luminescence

“…The afterglow decay profiles show dopant concentration dependency. When the Mn 4+ concentration increases to 4%, there is an inferior afterglow behavior, due to the concentration quenching and the formation of defect clusters [18]. As the inset shows, the optimal Mn 4+ content for the best afterglow performance is 0.5%.…”

“…Ge 4+ ions are ordered on the octahedral sites in the La 2 MgGeO 6 double perovskite-type structure which provides suitable sites for Mn 4+ . The preparation of La 2 MgGeO 6 materials usually involves a two-step thermal treatment, which requires high annealing temperatures (around 1400 • C) for a total period from 8 to 14 h [18][19][20]. To our knowledge, no alternative preparation methods for the Mn 4+ doped La 2 MgGeO 6 have been presented to date.…”

Rare‐earth‐free Li5La3Ta2O12:Mn4+ deep‐red‐emitting phosphor: Synthesis and photoluminescence properties

“…As one of non‐rare‐earth activators for red‐emitting phosphors, Mn 4+ ion with 3 d 3 electron configuration is attracting considerable interest because it can show broad absorption band in the range from 220 to 570 nm and exhibit red or deep red emission in the region from 600 to 790 nm due to the 2 E→ 4 A 2 transition . Mn 4+ ion can usually be stable in octahedral environments and substitute for the Al 3+ , Sc 3+ , Ga 3+ , Ti 4+ , Si 4+ , Ge 4+ , Zr 4+ , Sn 4+ , Ta 5+ , Nb 5+ , Sb 5+ , Te 6+ , Mo 6+ , and W 6+ sites in octahedral cell and form the octahedral center in host lattice . The luminescence properties of Mn 4+ ‐doped phosphors can be affected by the co‐valency of the “Mn 4+ ‐ Ligand” bonding and the host crystal field environment.…”

“…12,13 Mn 4+ ion can usually be stable | 5911 CAO et Al. in octahedral environments and substitute for the Al 3+ , Sc 3+ , Ga 3+ , Ti 4+ , Si 4+ , Ge 4+ , Zr 4+ , Sn 4+ , Ta 5+ , Nb 5+ , Sb 5+ , Te 6+ , Mo 6+ , and W 6+ sites in octahedral cell and form the octahedral center in host lattice. [14][15][16][17][18][19][20][21][22][23][24][25][26][27] The luminescence properties of Mn 4+ -doped phosphors can be affected by the co-valency of the "Mn 4+ -Ligand" bonding and the host crystal field environment. Up to now, there are two main kinds of hosts for Mn 4+ doping, such as fluorides and oxides.…”

Synthesis, structure, and luminescence of Eu3+‐activated La4Ti3O12nanoparticles with layered perovskite structure

“…Perovskites in AB O 3 formula are very famous oxides for various applications because of the excellent activities in ferroelectricity, piezoelectricity, optical lasers, electrochemistry devices, biology materials etc . A is a 12‐coordinated bigger ions such as alkaline‐earth metal or rare earth ions (RE), and B is a 6‐ coordinated smaller species such as transition‐metal ions .…”