Nonlinear optical and self-activated luminescent properties of A₂W₃O₁₀ (A = Rb and Cs)

Abstract

The nonlinear optical and luminescent properties of Rb2W3O10 and Cs2W3O10 show that the two compounds are candidates for NLO materials in wavelengths from the visible to mid-infrared and also potential UV-based self-activated luminescent materials.

Heteroanionic LaBrVIO4 (VI = Mo, W): Excellence in Both Nonlinear Optical Properties and Photoluminescent Properties

“…The IR spectrum did not show any intrinsic vibrational absorption of chemical bonds in the wavelength range of 2.5–10 μm. Strong absorption peaks appear in the range of 10–20 μm, which can be assigned to the ν­(Mo–O) or ν­(W–O) vibrations for LaBrMoO 4 and LaBrWO 4 , respectively. ,,− The IR spectrum of LaBrMoO 4 and LaBrWO 4 is comparable to many tungsten-oxides or molybdenum-oxides, such as CsNa 2 Eu 2 H 3 [Eu 2 (H 2 O) 7 (α-Si 2 W 18 O 66 )]­Cl 2 ·30H 2 O, La 3 Cl 3 [MoO 6 ], and K 5 (W 3 O 9 F 4 ) (IO 3 ) . The birefringence of LaBrVIO 4 (VI = Mo and W) was estimated by both experimental measurements and DFT calculations.…”

Rb21.89W32.66O108: An Excellent Mid- and Far-IR Nonlinear-Optical Material with a Wide Band Gap

“…The bands around 850.4 cm –1 should be assigned to the superposition of the asymmetric stretching vibration of the WO 6 group and W–O–W single oxygen bridge. Meanwhile, the spectral lines at 737 and 668 cm –1 mainly correspond to the symmetric stretching vibration of W–O–W. − As can be seen in Figure , over the range of greater than 935.4 cm –1 , there is no significant absorption peak. This shows that the IR cutoff edge of RWO is about 10.7 μm, which includes two very important atmospheric windows, 3–5 and 8–14 μm.…”

Resolving old problems with layered polytungstates related to hexagonal tungsten bronze: phase formation, structures, crystal chemistry and some properties

“…7,25,[30][31][32] Some potassium, rubidium, and cesium polytungstates are of practical importance. Low-melting A 2 W 2 O 7 (A = K, Rb) are used as fluxes for the crystal growth of AGd(WO 4 ) 2 and other laser host tungstates, 33,34 A 2 W 3 O 10 (A = Rb, Cs) are of interest as nonlinear optical and self-activated luminescent materials, 35,36 Cs 2 W 3 O 10 nanofibers also exhibit photocatalytic activity, 37 exfoliated nanosheets of layered Cs 6 W 11 O 36 possess efficient photochromic properties, 38 and K 2 W 4 O 13 nanowires can be applied as H 2 S sensors 39 and adsorbents for Pb 2+ removal from water. 40 Although the above systems have been studied repeatedly, the main problem still unsolved is the determination of the number, compositions, and structures of alkali polytungstates in the range of 75-90 mol% WO 3 .…”