Enhanced red luminescence in CaAl₁₂O₁₉:Mn⁴⁺via doping Ga³⁺ for plant growth lighting

Abstract

The chemical unit was engineered by substituting Ga3+ for Al3+ in CaAl12O19:Mn4+.

Short review on recent progress in Mn4+‐activated oxide phosphors for indoor plant light‐emitting diodes

“…The effect of Ga 3+ co‐doping in CaAl 12 O 19 :Mn 4+ was studied by Kong et al . [ 36 ] The CaAl 12 O 19 :0.005Mn 4+ (at which maximum PL was obtained) phosphor with excitation at 465 nm emitted red emission around 655 nm ( 2 E g → 4 A 2g ) and the emission spectra matched well with the absorption spectrum of phytochrome P R . Thus, CaAl 12 O 19 :0.005Mn 4+ phosphors can be used to modulate plant growth.…”

“…Chen et al . [ 36 ] co‐doped Dy 3+ ions in the La 2 MgGeO 6 (LMGO):Dy 3+ , Mn 4+ phosphors. Dy 3+ ions were substituted in the optimized LMGO:0.8%Mn 4+ samples in which they occupied La 3+ sites.…”

“…Recently, luminescent properties of Mn 4+ ‐activated oxide hosts in different octahedron environments have been studied. [ 18,33–38 ] It is also found that the double perovskite structures exhibit unusual optical properties. Furthermore, the variation in the luminescent properties is done through the co‐doping of foreign elements.…”

A review on the structural dependent optical properties and energy transfer of Mn4+ and multiple ion-codoped complex oxide phosphors

“…22a, the three absorption bands A (200-290 nm), B (290-420 nm), and C (420-550 nm) of the phosphors in the UV-vis absorption spectra can be attributed to the host lattice absorption, charge transfer transition of Mn 4+ -O 2-, and spinallowed transitions 4 A 2g / 4 T 1g and 4 A 2g / 4 T 2g of the Mn 4+ ions, respectively. 116 The absorption intensity of bands A and C decrease, but that of band B is enhanced with elevated Al 3+ concentrations, which indicates that the absorption intensity of the phosphor powder is enhanced in the ultraviolet light range, but reduced slightly in the blue light range.…”

A Novel Red-Emitting Na2NbOF5:Mn4+ Phosphor with Ultrahigh Color Purity for Warm White Lighting and Wide-Gamut Backlight Displays

“…Presently, non-rare-earth Mn 4+ red phosphors have been used in the packaging of WLEDs due to their high luminous efficacy and low cost [14][15][16]. Under UV or blue light excitation, Mn 4+ -doped oxide phosphors can emit a moderate-intensity deep red light in the range of 650-720 nm [17][18][19][20][21][22]. Fluoride phosphors (e.g., A 2 BF 6 :Mn 4+ ; A = Na, K, Rb, Cs; B = Si, Ti, Ge) show strong red emission with high color purity around 630 nm [23][24][25][26].…”