Preparation and luminescence properties of Li 2 MgZrO 4 :Mn 4+ red phosphor for plant growth

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

“…The luminescence properties of Mn 4+ ion are affected by the host crystal field and octahedral environment. The room‐temperature PLE and PL spectra of Li 5 La 3 Ta 2 O 12 :Mn 4+ (this work), Li 2 MgZrO 4 :Mn 4+ , Li 2 ZnSn 2 O 6 :Mn 4+ , Ca 2 LaTaO 6 :Mn 4+ , Ba 2 TiGe 2 O 8 :Mn 4+ , Mg 2 La 2 SnO 7 :Mn 4+ , Ca 3 Al 4 ZnO 10 :Mn 4+ , and LiGaTiO 4 :Mn 4+ phosphors are well represented in Figure . It can be well seen that their PLE/PL spectral shapes and peak positions are different due to the influences derived from the crystal field of host.…”

“…PLE and PL spectra of (A) Li 5 La 3 Ta 2 O 12 :Mn 4+ (this work), (B) Ca 2 LaTaO 6 :Mn 4+ , (C) Li 2 ZnSn 2 O 6 :Mn 4+ , (D) Mg 2 La 2 SnO 7 :Mn 4+ , (E) Ca 3 Al 4 ZnO 10 :Mn 4+ , (F) Li 2 MgZrO 4 :Mn 4+ , (G) Ba 2 TiGe 2 O 8 :Mn 4+ , and (H) LiGaTiO 4 :Mn 4+ phosphors at room temperature [Colour figure can be viewed at wileyonlinelibrary.com]…”

“…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.…”

Novel Mn4+ doped Ca2GdSbO6 red–emitting phosphor: A potential color converter for light‐emitting diodes

“…On the other hand, red–emitting phosphors also play an important role in LEDs towards plant cultivation illumination. In recent years, to avoid the negative effect of extreme weather and to meet the different requirements of human, indoor plant growth has been extensively developed, and as the supplementary light source, artificial light especially referring to the pc‐LED is needed . Blue (~450 nm), red (~660 nm), and far–red (~730 nm) lights are the essential energy sources for most plants, among which, red light can promote the formation of carbohydrates and accelerate the budding or flowering of plants .…”