The morphology-controlled synthesis and near-infrared (NIR) absorption properties of W(18)O(49) were systematically investigated for the application of innovative energy-saving windows. Various morphologies of W(18)O(49), such as nanorods, nanofibers, nanograins, nanoassembles, nanoplates, and nanoparticles, with various sizes were successfully synthesized by solvothermal reactions using organic alcohols as reaction media and WCl(6), W(EtO)(6), and WO(3) solids as the tungsten source. W(18)O(49) nanorods of less than 50 nm in length showed the best optical performance as an effective solar filter, which realized high transmittance in the visible region as well as excellent shielding properties of NIR light. Meanwhile, the W(18)O(49) nanorods also exhibited strong absorption of NIR light and instantaneous conversion of the absorbed photoenergy to the local heat.

We report a new dicalcium silicate phosphor, Ca(2-x)Eu(x)SiO4, which emits red light in response to blue-light excitation. When excited at 450 nm, deep-red emission at 650 nm was clearly observed in Ca1.2Eu0.8SiO4, the external and internal quantum efficiencies of which were 44 % and 50 %, respectively. The red emission from Ca(2-x)Eu(x)SiO4 was strongly related to the peculiar coordination environments of Eu(2+) in two types of Ca sites. The red-emitting Ca2SiO4:Eu(2+) phosphors are promising materials for next-generation, white-light-emitting diode applications.

A complex pattern: Single‐phase brookite, rutile, and rutile–anatase nanoparticles can be prepared from the new water‐soluble titanium(IV) complex (NH4)6[Ti4(C2H2O3)4(C2H3O3)2(O2)4O2]⋅4 H2O. It appears that the structural similarity of the complex anion to the brookite architecture allows the directional synthesis of brookite nanopowders in a pure form (see scheme).

We report the first successful synthesis of TiO 2 (B) nanoparticles by a one-step hydrothermal process. The process was performed under acidic conditions in a 0.59 M H 2 SO 4 solution at 160 °C for 24 h or at 200 °C for 6 h using a titanium metal complex with glycolic acid. The prepared nanoparticles were characterized by XRD, Raman spectroscopy, and TEM. TiO 2 (B) is a metastable phase and is one of the most intriguing forms of titanium oxide. All synthesis methods for TiO 2 (B) reported to date have required a multistep process involving solid-state synthesis of an alkali metal titanate, an ion-exchange reaction, and gentle dehydration.

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