Spectral analysis of Mn2+, Co2+ and Ni2+: B2O3–ZnO–PbO glasses

Recycling of solid wastes in the synthesis of Co-bearing calcium hexaluminate pigment

“…The general aspect was similar for all the pigments insofar as a wide band was obtained that was composed of three emissions in the NIR region, at w1200, 1300 and 1500 nm. These seem to be attributable to spin forbidden transitions of tetrahedrally coordinated Co 2þ ions from 4 A 2 (F) ground state to the excited 4 T 1 (F) state [19][20][21][22][23]. In the visible region, four bands of distinct intensities are noticed.…”

“…In the visible region, four bands of distinct intensities are noticed. This multiple excitation reflected at 471, 544, 580 and 610 nm is assigned to 4 A 2 (F) / 4 T 1 (P) forbidden d-d transitions of Co 2þ (3d 7 ) in a tetrahedral field (T d ) [19][20][21][22][23]. The exhibited colour is interpreted by the first reflected band at 471 nm in the range of blue visible light interval (490-450 nm) [23].…”

Synthesis of PbS/Ni 2+ doped CdS quantum dots cosensitized solar cells: Enhanced power conversion efficiency and durability

“…The electrons are injected into the TiO 2 film, and the holes are simultaneously scavenged to the CE via the hole transporting redox couple of the polysulfide electrolyte [47]. The Ni 2+ dopant creates spatially indirect energy gap in the midgap region of CdS QDs thus altering the charge separation and recombination dynamics [48][49][50]. This unique feature enables the photogenerated electron-hole pairs to quickly separate.…”

Co-doped Y2O3 optical functional nanoparticles and novel self-assembly squama-like aggregates

“…Sun et al reported that Co 2+ -doped Y 3 Al 5 O 12 nanocrystallites exhibit a red emission (630 nm) upon excitation with 420 nm [4]. Lakshminarayana in Co 2+ -doped B 2 O 3 -ZnO-PbO glasses, upon excitation with 580 nm, a red emission (625 nm) has been observed which originates from E 2 ( 2 G) → 4 A 2 (F 4 ) transition of Co 2+ ions in tetrahedral co-ordination [5]. However, little work has been reported about the emission spectrum of Y 2 O 3 nanoparticles doped by Co 2+ ions until now.…”