Exploring Mn²⁺-location-dependent red emission from (Mn/Zn)–Ga–Sn–S supertetrahedral nanoclusters with relatively precise dopant positions

Abstract

Temperature-sensitive and Mn2+-location-dependent red emission from (Mn/Zn)–Ga–Sn–S supertetrahedral nanoclusters.

Improving Photoluminescence Emission Efficiency of Nanocluster-Based Materials by in Situ Doping Synthetic Strategy

“…Such NC-based in situ doping method greatly improves the Mn 2+ doping level. As shown in our recent work, the Mn 2+ ions can in situ replace Zn 2+ sites in other supertetrahedral Zn 4 Ga 14 Sn 2 S 35 NC . Highly efficient red emission is expected because good crystalline samples effectively suppress the original DAP emission and reduce the nonradiative relaxation pathway.…”

“…As shown in our recent work, the Mn 2+ ions can in situ replace Zn 2+ sites in other supertetrahedral Zn 4 Ga 14 Sn 2 S 35 NC. 31 Highly efficient red emission is expected because good crystalline samples effectively suppress the original DAP emission and reduce the nonradiative relaxation pathway. In addition, a substantial amount of dopants could serve as additional Mn 2+ -related emission sites (Scheme 1d).…”

Optical Properties of Mn-Doped CuGa(In)S-ZnS Nanocrystals (NCs): Effects of Host NC and Mn Concentration

“…With respect to the NC optical properties, Mn in the host NCs could interact with the host lattice to aggravate or lessen lattice strains or defects depending on the Mn concentration [ 13 , 14 , 15 , 16 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. This could be the reason for the highest QY of NCs being for Mn = 0.0125 mmol, but there were lower QYs of other NCs with more or less Mn concentrations.…”

Direct observation of charge transfer between molecular heterojunctions based on inorganic semiconductor clusters

“…It is worth noting that for T4-MnInS, the strongest PLE peak at $372 nm was attributed to charge transfer from the host cluster to Mn 2+ ions, as these ions in the T4-MnInS cluster cannot be directly and effectively excited at this wavelength. 46 It should be noted that the typical absorption peak of Mn 2+ ions in T4-MnInS that is involved with the transition from 6 A 1 ( 6 S) to 4 E( 4 D) cannot be observed in its room-temperature PLE spectrum. This is possibly because Mn 2+ ions in the crystal lattice possess a relatively low d-d transition possibility or absorption coefficient at room temperature, and the weak PLE peak in the range of 375-410 nm is overlapped by the strong and wide PLE peak in a wide range of 350-410 nm.…”

“…In addition, T4-MnInS and T3-T4-MnInS displayed ve obvious absorption peaks at 2.0, 2.3, 2.4, 2.6, and 2.9 eV, attributed to the characteristic d-d transitions of Mn 2+ ions from the ground state [ 6 A 1 ( 6 S)] to excited states [ 4 E( 4 D), 4 T 2 ( 4 D), 4 E( 4 G) or 4 A 1 ( 4 G), 4 T 2 ( 4 G), and 4 T 1 ( 4 G)]. 46 No characteristic transitions of Fe 2+ were observed in the Tauc plot of T4-FeInS. These results suggest that compared to Fe 2+ ions in the T4-FeInS cluster, Mn 2+ ions in the T4-MnInS cluster feature a lower hybridization degree, in agreement with DFT results (Fig.…”