Tuneable blue-green co-activated CaAl2O4: 0.1 mol% Tb3+, x mol% Sm3+ (0 ≤ x ≤ 2) nanophosphor prepared by citrate sol-gel method

Impact of trivalent Yttrium on the structural and optical properties of CaAl2O4: New frontier in supercapacitor positive electrode

“…Further suggesting a successful Y 3+ ion incorporation within the CaAl 2 O 4 matrix [ 32 ]. Several studies such as Mabelane et al [ 33 ], Dlamini et al [ 34 ] and Shashikala et al [ 35 ], have shown similar results. The crystallite sizes ( ) together with induced strain ( ) of the prepared samples were analysed using the below Williamson – Hall on Eq.…”

“…The peak at 273 nm could be a result of imperfections within the host material, as there were no shifts in excitation peak observed for the Y 3+ doped samples. The emission monitored under the 213 nm excitation wavelength showed the presence of three peaks at 446, 550, and 674 nm which can be attributed to the host material [ 13 , 14 ]. The 273 nm excitation peak, and 446 and 550 nm emission peak intensity as a function of x mol % Y 3+ are displayed in Fig.…”

“…The citrate sol-gel technique is relatively inexpensive, produces samples with high homogeneity, manages stoichiometry better, and low – temperature synthesis [ 12 ]. Mabelane et al [ 13 ] and Dlamini et al [ 14 ] have successfully fabricated CaAl 2 O 4 aluminate phosphor via the citrate sol-gel technique. CaAl 2 O 4 showed the presence of various excitation and emissions peaks within the range of 200–300 and 400–800 nm, respectively, due to the defects within the material matrix [ 13 , 14 ].…”

“…Mabelane et al [ 13 ] and Dlamini et al [ 14 ] have successfully fabricated CaAl 2 O 4 aluminate phosphor via the citrate sol-gel technique. CaAl 2 O 4 showed the presence of various excitation and emissions peaks within the range of 200–300 and 400–800 nm, respectively, due to the defects within the material matrix [ 13 , 14 ]. This material has been doped at various degrees using rare earth ions (RE 3+ ) to improve the luminescent characteristics of nanomaterials [ 15 ].…”

“…This material has been doped at various degrees using rare earth ions (RE 3+ ) to improve the luminescent characteristics of nanomaterials [ 15 ]. Dlamini et al [ 14 ] have reported co-doped CaAl 2 O 4 with 0.1 % Tb 3+ ; x% Sm 3+ .The Photoluminescence (PL) results illustrated multiple emission peaks at 420, 440, 484, 548, 558, 562, 584, 603, and 654 nm attributed to defects within CaAl 2 O 4 material and Tb 3+ - Sm 3+ emission transitions. Yttrium (Y) ions have been reported to widen the band gap of semiconductors such as ZnO [ 16 ], leading to a substantial enhancement in the optical properties, photocatalytic efficiency and stability.…”