A multilayered approach of Si/SiO to promote carrier transport in electroluminescence of Si nanocrystals

The electroluminescence (EL) and photoluminescence of Si nanocrystals (Si-nc) from multilayered samples of Si/SiO are investigated. Si-nc are formed within Si and SiO layers after furnace annealing. It is found that the presence of Si interlayers creates extra carrier paths for EL emission. A comparative study is further performed on a multilayered Si/SiO sample and a single-layered one with Si and SiO homogeneously mixed. Both samples have the same ratio of Si to O and the same contents of Si and O. The multilayered sample is found to have higher EL intensity, less turn-on voltage, lower resistance, and higher current efficiency than the single-layered one. The results indicate that Si interlayers in Si/SiO may act as carrier channels, which promote carrier transport and enhance the EL emission of Si-nc

catena-Poly[[(nitrato-κ2 O,O′)silver(I)]-μ-N,N′-bis­(3-pyridyl­methyl­idene)benzene-1,4-diamine]

In the title compound, [Ag(NO3)(C18H14N4)]n, the AgI atom is coordinated by two N atoms from two N,N′-bis­(3-pyridyl­methyl­idene)benzene-1,4-diamine (bpbd) mol­ecules and two O atoms from a bidentate nitrate anion. The bpbd mol­ecules bridge the Ag atoms into a chain. Two adjacent chains are further connected by Ag⋯Ag inter­actions [3.1631 (8) Å], forming a double-chain structure. A π–π inter­action [centroid–centroid distance = 3.758 (3) Å] occurs between the double chains. Inter­chain C—H⋯O hydrogen bonds are observed

Antiferromagnetic to Ferrimagnetic Phase Transition and Possible Phase Coexistence in Polar Magnets (Fe1−x_{1-x}Mnx_x)2_2Mo3_3O8_8

In the present work, magnetic properties of single crystal (Fe$_{1-x}$Mn$_x$)$_2$Mo$_3$O$_8$ ($0<x<1$) have been studied by performing extensive measurements. A detailed magnetic phase diagram is built up, in which antiferromagnetic state dominates for $x<0.25$ and ferrimagnetic phase arises for $x>0.3$. Meanwhile, sizeable electric polarization of spin origin is commonly observed in all samples, no matter what the magnetic state is. For the samples hosting a ferrimagnetic state, square-like magnetic hysteresis loops are revealed, while the remnant magnetization and coercive field can be tuned drastically by simply varying the Mn-content or temperature. Possible coexistence of the antiferromagnetic and ferrimagnetic phases is proposed to be responsible for the remarkable modulation of magnetic properties in the samples