Novel Mn⁴⁺-activated LiLaMgWO₆far-red emitting phosphors: high photoluminescence efficiency, good thermal stability, and potential applications in plant cultivation LEDs

Abstract

phosphors are potential far-red phosphors for applications in plant cultivation LEDs.

Novel far-red-emitting SrGdAlO4:Mn4+ phosphors with excellent responsiveness to phytochrome PFR for plant growth lighting

“…[24][25][26][27][28][29][30][31][32][33][34][35] Compared with the Mn 4+ -doped uorides, Mn 4+ -activated oxides generally show intense far-red emissions in the 650-800 nm wavelength range, which are more suitable for plant growth lighting. [36][37][38] The materials of Mn 4+ -doped aluminates phosphors are cheaper than Mn 4+ -doped germinates phosphors. Recently, Mn 4+ -doped aluminates phosphors with eco-friendly preparation process and high chemical stability have been extensively investigated, such as SrMgAl 10 -O 17 :Mn 4+ , Ca 14 Al 10 Zn 6 O 35 :Mn 4+ , and CaMg 2 Al 16 O 27 :Mn 4+ .…”

Mn4+-activated Li3Mg2SbO6 as an ultrabright fluoride-free red-emitting phosphor for warm white light-emitting diodes

“…Evidently, the emission spectrum excited at 344 nm had the similar prole but the stronger emission intensity compared with that excited at 469 nm, and the PL spectra were composed of broad red emission bands in the range of 600-800 nm centered at around 651 nm, owing to the 2 E g / 4 A 2g transition of Mn 4+ ions. 41,42 Furthermore, the CIE chromaticity coordinates of LMS:0.6% Mn 4+ under the excitation 344 nm and 469 nm were both calculated to be (0.724, 0.276), which located in red region. Moreover, the phosphors also exhibited bright red light under 365 nm UV lamp, as shown in the inset in Fig.…”

Mn4+-activated BaLaMgSbO6 double-perovskite phosphor: a novel high-efficiency far-red-emitting luminescent material for indoor plant growth lighting

“…5(b), the IQE of BLMS:0.6%Mn 4+ sample was measured to be about 83%, which was much higher than that of many previously reported Mn 4+ -activated perovskite-type redemitting phosphors such as Li 2 MgZrO 4 :Mn 4+ (IQE: 32.3%), Ba 2 YNbO 6 :Mn 4+ (IQE: 29.2%), NaLaMgWO 6 :Mn 4+ (IQE: 60%), and LiLaMgWO 6 :Mn 4+ (IQE: 69.1%). 2,31,65,66 Moreover, we also compared our as-prepared BLMS:0.6% Mn 4+ with some recent reported Mn 4+ -doped red phosphors for plant growth lighting. Table 1 summarizes their host materials, optimal Mn 4+ doping concentrations, PL and PLE peaks and IQEs.…”