Citrate sol-gel synthesis of BaAl2O4:x% Cu2+ (0 ≤ x ≤ 1) nano-phosphors: Structural, morphological and photoluminescence properties

Effects of varying Sm3+ concentration on the structure, morphology and photoluminescence properties of the BaAl2O4 /CaAl2O4/Ca4Al6O13/Ca3Al2O6:x% Sm3+ (0 ≤ x ≤ 1.9) mixed phases using citrate sol-gel method

“…The results show emission peaks also at 454, 573 and 613 nm with an additional peak at 662 nm. The emission peaks at 573, 613 and 662 nm can also be attributed to 4 G 5/2 → 6 H 5/2 , 4 G 5/2 → 6 H 7/2 and 4 G 5/2 → 6 H 9/2 transitions of Sm 3+ , respectively [ 41 ]. The emission intensity as a function of Sm 3+ concentration is shown in Figure 7 (f), which shows that the optimum concentration is at x = 0.7%.…”

The Structural, Morphological and Optical Studies on Baal2o4/Mgal2o4/Mgo:X% Gd3+ (0 ≤ X ≤ 1.1) Mixed Phases Synthesized by Sol-Gel Method

“…The absorption band at 274 nm is ascribed to the O 2− →Al 3+ charge transition within the BaAl 2 O 4 of the prepared material [27]. This charge transition arises from electrons that are excited from the valence bandgap energy of O to the conduction bandgap energy of Al [27].…”

High-Temperature Phase Transition Containing Switchable Dielectric Behavior, Long Fluorescence Lifetime, and Distinct Photoluminescence Changes in a 2D Hybrid CuBr4 Perovskite

“…As shown in Figure 5a, we found that compound 1 shows a strong emission peak at a wavelength of 567 nm, which has undergone a red shift relative to the recently reported leadfree perovskite [H 3 NC 6 H 4 NH 3 ]CuBr 4 (500 nm). 32 As far as we know, divalent copper ions have a quenching effect on the fluorescence, such as BaAl 2 O 4 :x% Cu 2+ (0 ≤ x ≤ 1), 33 whose fluorescence gradually weakens and is finally completely quenched, with the content of the divalent copper ions increasing. However, compounds containing divalent copper ions, such as MA 2 CuCl 2 Br 2 , 34 MA 2 CuCl 0.5 Br 3 , 34 and [H 3 NC 6 H 4 NH 3 ]CuBr 4 , are also luminescent, which is different from the above compound with fluorescence quenching.…”