首页|Crystallization of RE2(OH)2CO3SO4·nH2O as a new family of layered hydroxides(RE=Gd-Lu lanthanides and Y),derivation of RE2O2SO4,photoluminescence and optical thermometry
Crystallization of RE2(OH)2CO3SO4·nH2O as a new family of layered hydroxides(RE=Gd-Lu lanthanides and Y),derivation of RE2O2SO4,photoluminescence and optical thermometry
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Layered rare-earth hydroxides(LREHs)draw wide research interest because of their peculiar crystal structure,rich interlayer chemistry and abundant functionality of the RE element,but are limited to the two categories of RE2(OH)5A·nH2O(A:typical of Cl-or NO3)and RE2(OH)4SO4·nH2O.On the other hand,rare-earth oxysulfates(RE2O2SO4)have attracted attention due to their properties of large-capacity ox-ygen storage,low-temperature magnetism and luminescence,but their preparation procedure mostly involves toxic Sox gases and/or complicated procedures.In this work,RE2(OH)2CO3SO4-nH2O as a new family of LREHs(RE=Gd-Lu lanthanides and Y)were produced via hydrothermal reaction,from which phase-pure RE2O2SO4 was derived via subsequent annealing at 800 ℃ in air without the involvement of Sox.The compounds were thoroughly characterized to reveal the intrinsic influence of lanthanide contraction(RE3+radius)on crystal structure,thermal behavior(dehydroxylation/decarbonation/desulfurization),vibrational property and crystallite morphology.Through analyzing the photo-luminescence of Eu3+and Sm3+in the Gd2O2SO4 typical host it is found that the 617 nm(Eu3+,λex=275 nm)and 608 nm(Sm3+,λex=407 nm)main emissions can retain as high as-79.6％and 85.5％of their room-temperature intensities at 423 K,with activation energies of-0.19 and 0.21 eV for thermal quenching,respectively.Application also indicates that both the phosphors have the potential for optical temperature sensing via the fluorescence intensity ratio(FIR)technology,whose maximum relative sensitivity reaches～2.70％/K for Eu3+and 1.73％/K for Sm3+at 298 K.
Layered hydroxideRE2O2SO4LuminescenceOptical temperature sensingRare earths
Fan Li、Zhenqi Song、Zhiyuan Pan、Sihan Feng、Qi Zhu、Ji-Guang Li
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Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China
Research Center for Functional Materials,National Institute for Materials Science,Tsukuba,Ibaraki,305-0044,Japan
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
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