Hydrothermal Synthesis,Crystal Structure and Properties of a 1D Chain Copper(Ⅱ) Polymer with 3-(2-Pyridiyl)-1H-1,2,4-triazole(Hpt)

A new 1D copper（Ⅱ） polymer [Cu（Hpt）（3,5-DMBA）]n has been hydrothermally synthesized with copper acetate,3-（pyridin-2-yl）-1,2,4-triazole（Hpt） and 3,5-dimethylbenzoic acid（3,5-DMBA）. It crystallizes in triclinic space group P1,with a = 8.1974（6）,b = 8.3280（6）,c = 12.5021（9） ？,α = 84.3320（10）,β = 71.8870（10）,γ= 65.4560（10）o,V = 737.44（9） ？~3,Dc = 1.612 g/cm3,Z = 2,F（000） = 366,GOOF = 1.035,R = 0.0298 and w R = 0.0855. The crystal structure is a one-dimensional（1-D） chain in which the Cu（Ⅱ） is five-coordinated with square pyramidal geometry. The crystal structure shows that the whole molecule consists of two copper ions bridged by two μ12-η：η0-3,5-dimethylbenzoic acid anions and two 3-（pyridin-2-yl）-1,2,4-triazole molecules. The coordination environment of Cu（Ⅱ） ion is CuO＋2N_3. The luminescence and thermal properties of the complex were investigated.

Effect of TSL and PSL in Al^(3+)-Doped BaFBr∶Eu^(2+) at Difference Synthesis Conditions

Thermal stimulated luminescence (TSL) and photostimulated luminescence (PSL) were used to investigate the luminescent performance of Al 3+ doped BaFBr∶Eu 2+ in different synthetic conditions. Theory analysis shows that the decay of TSL spectra is different from that of PSL spectra. Theoretical calculation was used to investigate the effects of energy state in Al 3+ doped BaFBr∶Eu 2+ by different synthetic conditions. The relationship of color center’s energy and different synthetic conditions is discussed.

Syntheses, Structure and Properties of a Strontium(Ⅱ) Complex with 5-Sulfoisophthalic Acid Monosodium

A new Sr（Ⅱ） complex, [Sr（Hsip）（H2O）] （1, NaH2sip = 5-sulfoisophthalic acid monosodium）, has been synthesized by solvothermal reaction of SrCO3 and NaH2sip at 120 ℃, and characterized by single-crystal X-ray diffraction studies, elemental analysis and FT-IR. Single- crystal X-ray diffraction reveals that compound 1 has a 3D architecture, and there is only one crystallographically independent Sr（Ⅱ） ion in 1. The coordination geometry of Sr（Ⅱ） is a distorted tetragonai anti-prism. The whole Hsip2- ligand performs aμ6-coordination model. In the solid state, complex 1 shows luminescence with the maximum emission intensity at 417 nm upon excitation at 320 nm. Thermal stability of complex 1 was also investigated.

Thermal and luminescent properties of 2 μm emission in thulium-sensitized holmium-doped silicate-germanate glass

In this paper, we present the luminescent properties of Tm^(3+)∕Ho^(3+)co-doped new glass. A series of silicategermanate glass was prepared by the conventional melt-quenching method. In the Tm^(3+)∕Ho^(3+)co-doped silicategermanate glass, a strong emission of 2 μm originating from the Ho^(3+):~5I_7→~5I_8transition can be observed under conventional 808 nm pumping. The characteristic temperatures, structure, and absorption spectra have been measured. The radiative properties of Ho^(3+)in the prepared glass were calculated. The emission cross section of Ho^(3+)ions transition can reach 4.78 × 10^(-21)cm^2 around 2 μm, and the FWHM is as high as 153 nm. The energy transfer efficiency between Ho^(3+)and Tm^(3+)has a large value(52%), which indicates the Tm^(3+)∕Ho^(3+)co-doped silicategermanate glass is a suitable candidate for the 2 μm laser. Moreover, the energy transfer mechanism between Tm^(3+)and Ho^(3+)ions was investigated.

Optical and thermoluminescence properties of Lu_2Si_2O_7:Pr single crystal

Single crystal of Lu2Si2OT：Pr was grown by Czochralski method. Transmittance, photoluminescence excitation （PLE） and photo- luminescence （PL） spectra, X-ray excited luminescence （XEL） and fluorescence decay time spectra of the sample were measured and dis- cussed to investigate its optical characteristics. The crystal structure of the as grown Lu2Si207：Pr was confirmed to be C2/m. There was a broad absorption peaking at 245 um in the region from 200-260 urn. The PL spectntm was dominated by fast 3py^3Hj band peaking at 524 nm. The XEL spectrum was dominated by the fast 5d14t^---~41e emission peaking at 265 nm. The 2D （temperature-intensity） and 3D （tem- perature-wavelength-intensity） thermally stimulated luminescence （TSL） spectra were measured. The Pr3＋ ion was found to be the recombina- tion center during the TSL process. Three obvious traps were detected in LPS：Pr single crystal with energy depth at 1.06, 0.78 and 0.67 eV.

Ultralong afterglow and unity quantum yield from a transparent CsCdCl_(3):Mn crystal

Transparent afterglow crystals are keenly desired for three-dimensional information storage.Herein,CsCdCl3 perovskite crystals were grown by a programmable cool-ing procedure in a hydrothermal reactor.The pristine crystal showed an abnormal optical behavior where the absorption increased by 2.3 folds at high temperature,leading to a fourfold boost of photoluminescence(PL)intensity.After Mn2+dop-ing,the PL quantum yield was improved to nearly unity.Importantly,the doped crystals exhibited an ultralong afterglow up to 12 h after ceasing UV excitation and a high transmittance up to 75%in the visible region.This work brought a new mem-ber to the library of transparent afterglow crystal,opening up many possibilities to advanced applications such as volumetric display and three-dimensional information encryption.