Photoluminescence of β-Ba2ScAlO5: Eu3+ red emitting phosphors effectively activated by UV light

Synthesis of the Red-Emitting (Ba, Ca)2ScAlO5:Eu3+ Phosphors with Photoluminescence Properties

“…The surface composition and the valence state of various elements were determined by X-ray photoelectron spectroscopy (XPS, ESCALAB 250Xi, Thermo Fisher, UK) with a monochromatic Al Kα X-ray source, and the binding energy of C 1s was calibrated at 284.8 eV. Aluminum high-resolution solid-state nuclear magnetic resonance ( 27 Al NMR) was obtained on a Bruker AVANCE III instrument (principal field 400 MHz) equipped with high-speed MAS probe heads (spinning rates of 30 kHz in aluminum free zirconia rotors of 4 mm diameter). The 27 Al chemical shifts were referenced relative to 1 M Al(NO 3 ) 3 aqueous solution at 0 ppm.…”

“…Aluminum high-resolution solid-state nuclear magnetic resonance ( 27 Al NMR) was obtained on a Bruker AVANCE III instrument (principal field 400 MHz) equipped with high-speed MAS probe heads (spinning rates of 30 kHz in aluminum free zirconia rotors of 4 mm diameter). The 27 Al chemical shifts were referenced relative to 1 M Al(NO 3 ) 3 aqueous solution at 0 ppm. The UV−vis diffuse reflectance spectra (UV−vis DRS, UV-3600, Shimadzu, Japan) were measured to calculate the optical band gap of phosphors.…”

“…29 In the crystal structure skeletons of Figure 3a Eu 3+ is relatively small. In alkaline earth metal aluminates, the 27 Al chemical shift of [AlO 4 ] is closely related to the total relative amount of alkaline earth metal oxides (CaO + BaO). It is reported that the 27 Al chemical shift decreases with the decrease of the total amount of alkaline earth metal; that is why the shift in β-(Ba, Ca) 2 ScAlO 5 :Eu 3+ is smaller than that in α-(Ba, Ca) 2 ScAlO 5 :Eu 3+ .…”

“…In 1990, Soviet Union scientists obtained the single-crystal structure of Ba 2 ScAlO 5 and found that the crystal structure of Ba 2 ScAlO 5 has two types, alpha-Ba 2 ScAlO 5 and beta-Ba 2 ScAlO 5 . − Wang et al pointed out that (Ba, Ca) 2 ScAlO 5 formed after the substitution of Ba atom in Ba 2 ScAlO 5 by Ca atom have a vital role in the scandia-doped impregnated cathode . The excellent electron-emitting properties of (Ba, Ca) 2 ScAlO 5 were further demonstrated because of the unique perovskite structure. , By co-doping the rare earths of erbium (Er) and ytterbium (Yb), the Ba 2 ScAlO 5 exhibits excellent up-conversion luminescence performance. , Recently, the β-Ba 2 ScAlO 5 :Eu 3+ red-emitting phosphors activated by UV light were successfully prepared . Although extensive research has been conducted on the luminescent materials of Ba 2 ScAlO 5 , this perovskite structure with co-doping Ca ion [(Ba, Ca) 2 ScAlO 5 ] has not yet been utilized in red-emitting phosphors.…”

“…25,26 Recently, the β-Ba 2 ScAlO 5 :Eu 3+ red-emitting phosphors activated by UV light were successfully prepared. 27 Although extensive research has been conducted on the luminescent materials of Ba 2 ScAlO 5 , this perovskite structure with co-doping Ca ion [(Ba, Ca) 2 ScAlO 5 ] has not yet been utilized in red-emitting phosphors.…”