Extraordinarily high quantum efficiency and abnormal negative thermal quenching were simultaneously achieved in oxide phosphors Ca 7 Mg 2 Ga 6− y Al O 18 :Mn 4+ by structurally confining Mn -emitters at isolated octahedral sites.

The fluorine atoms in BiB₂O₄F withdraw the non-bonding electrons of Bi³⁺and thus strongly increase SHG efficiency.

Abstract We propose several superiorities of applying some particular metal sulfides to the photocatalytic nitrate reduction in aqueous solution, including high density photogenerated excitons, N 2 selectivity (without over-reduction ammonia). Indeed, ZnCr S 4 behaved as a highly efficient photocatalyst and with assistance 1 wt% cocatalysts (RuO x , Ag, Au, Pd, or Pt), efficiency was greatly improved. The simultaneous loading Pt Pd led synergistic effect. It offered highest conversion rate...

Two new bismuth hydroxyl borates, Bi(2)O(2)[B(3)O(5)(OH)] (I) and Bi(2)O(2)[BO(2)(OH)] (II), have been synthesized under hydrothermal conditions. Their structures were determined by single-crystal powder X-ray diffraction data, respectively. Compound I crystallizes in the orthorhombic space group Pbca with lattice constants of a = 6.0268(3) Å, b 11.3635(6) c 19.348(1) Å. II monoclinic Cm 5.4676(6) 14.6643(5) 3.9058(1) β 135.587(6)°. The borate fundamental building block (FBB) is three-ring...

Sol-gel method was applied to prepare homogenous and highly crystalline phosphors with the formulas α-GdB5O9:xTb(3+) (0 ≤ x 1), α-Gd1-xCexB5O9 0.40), α-GdB5O9:xCe(3+), 0.30Tb(3+) 0.15) α-GdB5O9:0.20Ce(3+), xTb(3+) 0.10). The success of syntheses proved by linear shrinkage or expansion cell volumes against substitution contents. In α-GdB5O9:xTb(3+), an efficient energy transfer from Gd(3+) Tb(3+) observed there no luminescence quenching. exceptionally high efficiency f-f excitations implies...

An open-framework gallium borate with intrinsic photocatalytic activities to water splitting has been discovered. Small inorganic molecules, H3BO3 and H3B3O6, are confined inside structural channels by multiple hydrogen bonds. It is the first example experimentally show template effect of boric acid in flux synthesis.

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCsSiB3O7: A Beryllium-Free Deep-Ultraviolet Nonlinear Optical Material Discovered by the Combination of Electron Diffraction and First-Principles CalculationsZhengyang ZhouZhengyang ZhouCollege Chemistry Chemical Engineering, Chongqing University, 401331, People's Republic ChinaCollege Molecular Peking Beijing 100871, ChinaMore Zhengyang Zhou, Yi QiuYi QiuCollege Qiu, Fei LiangFei LiangBeijing Center for Crystal R&D, Key Lab Functional...

Mn4+-activated phosphors have shown wide prospective applications in phosphor-converted white light-emitting diodes (pc-WLEDs) and pc-LEDs used illumination indoor plant cultivation, respectively. Recently, double perovskites A2B'B''O6 with a tunable crystal structure versatile octahedral sites been extensively studied as good host matrixes for Mn4+-emitters to realize far-red emissions. Herein, series of double-double perovskite-type ALaLiTeO6:Mn4+ (A = Ba, Ba0.5Sr0.5, Sr, Sr0.5Ca0.5, Ca)...

Archetype stuffed tridymites AM2O4 typically exhibit a polar P622-structure, characterized by MO4-tetrahedra arranged in UDUDUD ring topology, where U (up) and D (down) denote the orientation of with respect to plane grids. However, most adopt centrosymmetric structures due size mismatch between A-cation cavity [M2O4]n− anionic framework, which alters topology results centrosymmetry. Therefore, innovative strategies are pressingly needed design alternative topologies facilitate fine...

Recent advancements in optical thermometry utilizing the fluorescence intensity ratio (FIR) technology have attracted tremendous attention real-time temperature measurements due to its numerous advantages, such as high sensitivity. In...

Photocatalytic water splitting and CO2 reduction offer sustainable solutions to energy environmental issues, but efficient semiconductor photocatalysts are still limited. Oxide with d0 and/or d10 metals often have wide bandgaps, incorporating d10ns2 can raise the valence band maximum (VBM) narrow bandgap. Here, we synthesized BiTi4GaO11 (BTGO), a new photocatalyst containing d106s2, d0, metals. Structural analysis via powder X-ray neutron diffraction confirmed BTGO crystallizes in space...

CuInS₂ exhibits a high record of photocatalytic efficiency in visible light driven nitrate reduction without over-reduction nor H₂ generation.

Borates are well-known candidates for optical materials, but their potentials in photocatalysis rarely studied. Ga3+-containing oxides or sulfides good applications because the unoccupied 4s orbitals of Ga usually contribute to bottom conducting band. It is therefore anticipated that Ga4B2O9 might be a promising photocatalyst its high Ga/B ratio and three-dimensional network. Various synthetic methods, including hydrothermal (HY), sol–gel (SG), high-temperature solid-state reaction (HTSSR),...

The stability and phase transformations of the four BiB3O6 polymorphs, i.e., α-, β-, γ- δ-BiB3O6, were investigated under different temperatures pressures. β-BiB3O6 is a metastable which can only be obtained by boric acid flux method in sealed system at low temperature. other are thermodynamic stable phases. Owing to large kinetic effect, polymorphs generally slow, thus an extensive annealing process was used this study. study shows that α-BiB3O6 high-temperature its area narrow (710–715 °C)...

Ln(2)B(6)O(10)(OH)(4)•H(2)O (Ln = Pr, Nd, Sm-Gd, Dy, Ho, and Y), a new series of hydrated rare earth borates, have been synthesized under hydrothermal conditions. A single crystal Nd analogue was used for the structure determination by X-ray diffraction. It crystallizes in monoclinic space group C2/c with lattice constants 21.756(4), b 4.3671(9), c 12.192(2) Å, β 108.29(3)°. The other compounds are isostructural to Nd(2)B(6)O(10)(OH)(4)•H(2)O. fundamental building block (FBB) polyborate...

Scheelite compounds with Eu(3+) substitution are well-known red-phosphors. We prepared and performed a detailed structural characterization of A(1-1.5x)Eu(x)□(0.5x)WO4 A(0.64-0.5y)Eu(0.24)Li(y)□(0.12-0.5y)WO4 (A = Ca, Sr; □ vacancy) to confirm the A-site vacancy mechanism for charge balance when bivalent A cations were substituted by Eu(3+). All crystallize in I4₁/a disordered arrangement A(2+), Eu(3+), at A-site. The title all good red phosphors high R/O ratio (∼10), indicating that is...

Incorporation of Bi 3+ -activators and Zn 2+ -charge compensators into the triangular prism site Ga -site, respectively, improves quantum efficiency maintains high photoluminescence thermal stability.

Band structure engineering is an efficient technique to develop desired semiconductor photocatalysts, which was usually carried out through isovalent or aliovalent ionic substitutions. Starting from a UV-activated catalyst ZnGa2S4, we successfully exploited good visible light photocatalysts for H2 evolution by In(3+)-to-Ga(3+) and (Cu(+)/Ga(3+))-to-Zn(2+) First, the bandgap of ZnGa2-xInxS4 (0 ≤ x 0.4) decreased 3.36 3.04 eV lowering conduction band position. Second, Zn1-2y(CuGa)yGa1.7In0.3S4...

γ-Ga₂O₃ exhibited the highest photocatalytic activity among studied photocatalysts, however, it suffered from slight hydrolysis, which can be efficiently suppressed by several methods.

1,2-Diols are important organic intermediates in the production of a variety chemicals, and their eco-friendly has attracted much attention, especially from epoxide hydration using solid-acid catalysts. Herein, Fe3+-incorporated PKU-1 molecular sieve (Fe–PKU-1), an open-framework octahedra-based aluminoborate with 18-membered-ring channels, was successfully synthesized behaved as solid Lewis acid to catalyze ring-opening epoxides. The as-synthesized Fe–PKU-1 catalyst high catalytic...