Synthesis and photoluminescence properties of Ca2LaTaO6:Mn4+ phosphor for plant growth LEDs

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

“…E without is the emission spectra of the excitation light, recorded with the equipment blank sample in place. Here, The QE value of LLTO:0.4 mol% Mn 4+ phosphor is ~38.6%, which is close to that of Gd 2 ZnTiO 6 :Mn 4+ (~39.7%) and larger than those of Mn 4 +‐doped luminescence materials, such as Ca 2 LaTaO 6 :Mn 4+ (~34.6%), Ba 2 TiGe 2 O 8 :Mn 4+ (~35.6%), and Mg 2 La 2 SnO 7 :Mn 4+ (~28.55%) …”

“…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.…”