Far red and near infrared double-wavelength emitting phosphor Gd 2 ZnTiO 6 : Mn 4+ , Yb 3+ for plant cultivation LEDs

Enhanced photoluminescence and energy transfer performance of Y3Al4GaO12:Mn4+,Dy3+ phosphors for plant growth LED lights

“…In order to reduce the reaction temperature and surface defects of the product, and increase the crystallinity of the product, uxing agent oen needs to add in the raw material such as BaF 2 , NaF, NH 4 Cl and H 3 BO 3 . 35 The third method to improve luminescence performances is to use energy transfer effect, such as Ca 14 Al 10 Zn 6 O 35 :Ti 4+ ,Mn 4+ , 31 Ca 3 Al 4 ZnO 10 :-Bi 3+ ,Mn 4+ , 26 Gd 2 ZnTiO 6 :Mn 4+ ,Yb 3+ , 37 and so on.…”

Dual‐activator luminescence of LuAG:Mn4+/Tb3+ phosphor for optical thermometry

“…The PLE spectrum is obtained by monitoring at 668 nm. There are four bands centered at 312 nm, 347 nm, 370 nm, and 470 nm, assigned to O 2‐ ‐Mn 4+ charge transfer and Mn 4+ : 4 A 2 → 4 T 1 , 4 A 2 → 2 T 2 , and 4 A 2 → 4 T 2 transitions, respectively . 4 A 2 → 4 T 1 and 4 A 2 → 4 T 2 are spin‐allowed transitions and 4 A 2 → 2 T 2 is spin‐forbidden transition according to the spin selection rules of ∆S = 0.…”

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

“…These sharp line peaks in the range 470‐500 nm are possible derived from the Xe‐lamp excitation source. The PL band (650‐800 nm) of LLTO:0.4mol%Mn 4+ phosphor on the 314 nm excitation is attributed to 2 E g → 4 A 2g transition of Mn 4+ ion with maximum peak at 714 nm, and the full‐width at half maximum (FWHM) is ~34 nm. As shown in inset, LLTO:0.4 mol% Mn 4+ phosphor emits red light on the 314 nm excitation with the corresponding commission internationale Ed I'eclairage (CIE) chromaticity coordinates (0.7326, 0.2674).…”

“…48,49 These sharp line peaks in the range 470-500 nm are possible derived from the Xe-lamp excitation source. The PL band (650-800 nm) of LLTO:0.4mol%Mn 4+ phosphor on the 314 nm excitation is attributed to 2 E g → 4 A 2g transition of Mn 4+ ion with maximum peak at 714 nm, 50 Monitored at 714 nm with excitation at 314 nm, the quantum efficiency (QE) of representative LLTO:0.4 mol% Mn 4+ phosphor is measured and calculated directly using Edinburgh FLS 980 instrument with an integrated sphere through the following calculation formula 51 : where η is the quantum efficiency. L direct is the complete emission spectrum of the sample being measured.…”