Synthesis and Photoluminescence Properties of Ba₂GeO₄:Mn⁴⁺ Novel Deep Red-emitting Phosphor

Synthesis and photoluminescence properties of a novel red phosphor SrLaGaO4:Mn4+

“…With this technique, plants are grown in a closed chamber, together with controlled water supply, temperature, humidity, and even light source. It is expected that people cultivate high value‐added crops no matter of the weather …”

Enriching the Deep-Red Emission in (Mg, Ba)3M2GeO8: Mn4+ (M = Al, Ga) Compositions for Light-Emitting Diodes

“…Gu et al developed red LEDs by combining the SrMgAl 10– y Ga y O 17 : Mn 4+ phosphor with blue LEDs, and its CIE coordinate values vary from (0.146, 0.036) to (0.578, 0.229) . Here, we fabricated three red LEDs, and the corresponding CRI (35, 47, and 49) and CIE values (0.472, 0.174), (0.624, 0.327), and (0.705, 0.286) are found to be suitable for artificial lighting for plant growth. , …”

“…The emission peak centered at 659 nm matches well with the absorption peaks of chlorophyll A and chlorophyll B responsible for photosynthesis and photoperiodic effects in plant leaves. 18,70 The red LED developed by combining red phosphors with blue LED has two emission bands at 410 and 659 nm. Hence, this LED can cover the absorption spectrum of phytochrome Pr since its absorption spectrum exhibits major bands at 405 and 655 nm.…”

“…53 Here, we fabricated three red LEDs, and the corresponding CRI (35, 47, and 49) and CIE values (0.472, 0.174), (0.624, 0.327), and (0.705, 0.286) are found to be suitable for artificial lighting for plant growth. 18,70…”

Synthesis, structure, and luminescence characteristics of far-red emitting Mn4+-activated LaScO3perovskite phosphors for plant growth

“…Mn 4+ ions in particular host materials with octahedral structures can emit red light and even deep red light due to the 2 E g → 4 A 2g transition, 34–37 such as Sr 4 Al 14 O 25 :Mn 4+ (652 nm), 38 NaMgGdTeO 6 :Mn 4+ (697 nm), 39 Ca 3 La 2 W 2 O 12 :Mn 4+ (711 nm), 40 La 2 MTiO 6 :Mn 4+ (M = Mg and Zn; 710 nm), 41 and Ba 2 GeO 4 :Mn 4+ (667 nm). 42 Considering that the structure of the LaScO 3 compound with [ScO 6 ] octahedral structure is similar to LaAlO 3 and Mn 4+ -doped LaAlO 3 phosphors can emit far-red emission, so the LaScO 3 compound has been chosen as the host for Mn 4+ doping. 43,44 Thus, in this work, LaScO 3 and Mn 4+ ions had been chosen for the host material and activator, respectively, and a series of LaScO 3 : x Mn 4+ ( x = 0.0005–0.0090) phosphors with different Mn 4+ doping concentration had been synthesized.…”