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Co-Precipitation Synthesis of La2O2SO4:Tb3+ Phosphor and its Conversion to La2O2S:Tb3+ Ceramic Scintillator via Pressureless Sintering in Hydrogen
G.X. Xu, J.B. Lian, N.C. Wu, X. Zhang, J. He
School of Mechanical Engineering, New Functional Materials Laboratory, Liaoning Shihua University, Fushun, 113001, P.R. China
received March 1, 2018, received in revised form April 6, 2018, accepted April 23, 2018
Vol. 9, No. 3, Pages 345-352 DOI: 10.4416/JCST2018-00018
Abstract
This research reports on the synthesis of a series of lanthanum compounds. As an intermediate product, La2O2SO4:Tb3+phosphors were prepared with a co-precipitation method. La2O2S:Tb3+ ceramic scintillator was then synthesized by means of pressureless reaction sintering in a hydrogen atmosphere. XRD patterns show that the crystal structure of the precursor is unidentified, and it can be transformed into pure La2O2SO4 phase after calcination at 800 °C in air. Compared with the Tb3+-ions-doped precursor, the La2O2SO4:Tb3+ phosphor has a stronger green emission peak at around 542 nm, which is attributed to 5D4→7F5 transition of Tb3+ ions. The La2O2SO4:Tb3+ phosphor exhibits the highest green luminescence when the concentration of Tb3+ is 12 %. The corresponding decay process (5D4→7F4) of the La2O2SO4:12%Tb3+ phosphor can be fitted into a double exponential function with 0.217 μs and 2.212 μs for t1 and t2, respectively. La2O2S:Tb3+ ceramic scintillator could be fabricated by sintering the La2O2SO4:Tb3+ phosphor in a hydrogen atmosphere. It appears greenish yellow with good translucency and light output performance.
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Keywords
Lanthanum compounds, co-precipitation, pressureless sintering, photoluminescence, ceramic scintillator
References
1 Manigandan, R., Giribabu, K., Suresh, R., Munusamy, S., Praveen kumar, S., Muthamizh, S., Dhanasekaran, T., Padmanaban, A., Narayanan, V.: Synthesis, growth and photoluminescence behaviour of Gd2O2SO4:Eu3+ nanophosphors: The effect of temperature on the structural, morphological and optical properties, RSC. Adv., 5, 7515 – 7521, (2015).
2 Li, J.G., Wang, X.J., Liu, W.G., Zhu, Q., Li, X.D., Sun, X.D.: (La0.97RE0.01Yb0.02)2O2S nanophosphors converted from layered hydroxyl sulfate and investigation of upconversion photoluminescence (RE=Ho, Er), Nanoscale Res. Lett., 12, 508, (2017).
3 Xie, M.B., Zhu, G.X., Li, D.Y., Pan, R.K., Fu, X.H.: Eu2+/Tb3+/Eu3+ energy transfer in Ca6La2Na2(PO4)6F2:Eu, Tb phosphors, RSC Adv., 6, 33990 – 33997, (2016).
4 Koichi, K., Shiori, Y., Ken, K., Kiyoshi, K.: Highly transparent, bright green, sol-gel-derived monolithic silica-(Tb,Ce)PO4 glass-ceramic phosphors, RSC Adv., 4, 26692 – 26696, (2014).
5 Li, H.D., Li, Y.J., Gu, S.N., Wang, F.Z., Zhou, H.L., Liu, X.T., Ren, C.J.: Enhancement of photocatalytic activity in Tb/Eu co-doped Bi2MoO6: the synergistic effect of Tb-Eu redox cycles, RSC Adv., 6, 48089 – 48098, (2016).
6 Xiao, Y., George, R.F., Robert, W., Jack, S.: Contrasting behaviour of the co-activators in the luminescence spectra of Y2O2S:Tb3+, Er3+ nanometre sized particles under UV and red light excitation, Nanoscale, 5, 1091 – 1096, (2013).
7 Benjamin, V., Jörg, N., Andreas, U., Rajesh, K., Markus, H.: Effect of the crystal structure of small precursor particles on the growth of β-NaREF4 (RE = Sm, Eu, Gd, Tb) nanocrystals, Nanoscale, 5, 806 – 812, (2013).
8 Kim, J., Piao, Y., Hyeon, T.: Multifunctional nanostructured materials for multimodal imaging, and simultaneous imaging and therapy, Chem. Soc. Rev., 38, 372 – 390, (2009).
9 Song, L.X., Du, P.F., Jiang, Q.X., Cao, H.B., Xiong, J.: Hydrothermal synthesis and photoluminescence properties of Gd2O2SO4:Eu3+ spherical phosphors, J. Lumin., 150, 50 – 54, (2014).
10 Wang, X., Liu, Q., Bu, Y., Liu, C.S., Liu, T., Yan, X.: Optical temperature sensing of rare-earth ion doped phosphors, RSC Adv., 5, 86219 – 86236, (2015).
11 Dong, H., Sun, L.D., Yan, C.H.: Energy transfer in lanthanide upconversion studies for extended optical applications, Chem. Soc. Rev., 44, 1608 – 1634, (2015).
12 Huang, X.Z., Liu, Z., Yang, Y.Y., Tian, Y.: Molten salt synthesis of La2O2SO4 nanosheet and their luminescent properties with Eu3+ doping, Funct. Mater. Lett., 6, 1350019 – 1350012, (2013).
13 Luiz, C.M., Marcos, T.D.A., Hamilton, P.S.C., Jivaldo, R.M., Tlo, O.M.: Formation of oxysulfide LnO2S2 and oxysulfate Ln2O2SO4 phases in the thermal decomposition process of lanthanide sulfonates (Ln= La, Sm), J. Therm. Anal. Calorim., 107, 305 – 311, (2012).
14 Tsuyoshi, K., Takeshi, I., Masami, S., Masafumi, U., Go, S.E.: Emission properties of Tb3+ in Y2O2SO4 derived from their precursory dodecylsulfate-templated concentric- and straight-layered nanostructures, J. Alloy. Compd., 485, 730 – 733, (2009).
15 Machida, M., Kawamura, K., Kawano, T., Zhang, D., Ikeue, K.: Layered Pr-dodecyl sulfate mesophases as precursors of Pr2O2SO4 having a large oxygen-storage capacity, J. Mater. Chem., 16, 3084 – 3090, (2006).
16 Wang, X.J., Li, J.G., Zhu, Q., Sun, X.D., Photoluminescence of (La,Eu)2O2SO4 red-emitting phosphors derived from layered hydroxide, J. Alloy. Compd., 5, 28 – 34, (2014).
17 Lian, J.B., Sun, X.D., Liu, Z.G., Yu, J.Y., Li, X.D.: Synthesis and optical properties of (Gd1-x, Eux)2O2SO4 nano-phosphors by a novel co-precipitation method, Mater. Res. Bull., 44, 1822 – 1827, (2009).
18 Wang, X.J., Li, J.G., Molokeev, M.S., Zhu, Q., Li, X.D., Sun, X.D., Layered hydroxyl sulfate: controlled crystallization, structure analysis, and green derivation of multi-color luminescent (La, RE)2O2SO4 and (La, RE)2O2S phosphors (RE=Pr, Sm, Eu, Tb, and Dy), Chem. Eng. J., 15, 577 – 586, (2016).
19 Wang, X.J., Li, J.G., Maxim S.M., Wang, X.J., Liu, W.G., Zhu, Q., Hidehiko, T., Keiko, S., Byung, N.K., Yoshio, S.: Hydrothermal crystallization of a Ln2(OH)4SO4·nH2O layered compound for a wide range of ln (Ln=La-Dy), thermolysis, and facile transformation into oxysulfate and oxysulfide phosphors, RSC. Adv., 7, 13331 – 13339, (2017).
20 Wang, Y., Yang, B., Chen, X.M., Ma, W.H., Xu, B.Q.: Color-tunable and upconversion luminescence of Gd2O2S:Er, Tb phosphor, Mater. Chem. Phys., 169, 113 – 119, (2016).
21 Ding, Y.J., Zhang, Z.Y., Wang, L.X., Zhang, Q.T., Pan, S.B.: The role of sodium compound fluxes used to synthesize Gd2O2S:Tb3+ by sulfide fusion method, J. Mater. Sci., 28, 2723 – 2730, (2016).
22 Jiang, G.C., Wei, X.T., Chen, Y.H., Duan, C.K., Yin, M., Yang, B., Cao, W.W.: Luminescent La2O2S:Eu3+ nanoparticles as non-contact optical temperature sensor in physiological temperature range, Mater. Lett., 143, 98 – 100, (2015).
23 Yu, L.X., Li, F.H., Liu, H.: Fabrication and photoluminescent characteristics of one-dimensional La2O2S:Eu3+ nanocrystals, J. Rare. Earth., 31, 356 – 359, (2013).
24 Wang, X.J., Zhu, Q., Li, J.G., Hu, Z.P., Zhu, G., Wang, C.: La2O2S:Tm/Yb as a novel phosphor for highly pure near-infrared upconversion luminescence, Scripta Mater., 149, 121 – 124, (2018).
25 Struebing, C., Lee, G., Wagner, B., Kang, Z.T.: Synthesis and luminescence properties of tb doped LaBGeO5 and GdBGeO5 glass scintillators, J. Alloy. Compd., 686, 9 – 14, (2016).
26 Greskovich, C., Duclos, S.: Ceramic scintillators, Annu. Rev. Mater. Sci., 27, 69 – 88, (1997).
27 Bo, K.C., Jong, Y.K., Tae, J.K., Cheulmuu, S., Gyuseong, C.: Fabrication and imaging characterization of high sensitive CsI(Tl) and Gd2O2S(Tb) scintillator screens for X-ray imaging detectors, Radiat. Meas., 45, 742 – 745, (2010).
28 Orlovskii, Y.V., Basiev, T.T., Pukhov, K.K., Polyachenkova, M.V., Fedorov, P.P., Alimov, O.K., Gorokhova, E.I., Demidenko, V.A., Khristich, O.A., Zakalyukin, R.M.: Oxysulfide optical ceramics doped by Nd3+ for one micron lasing, J. Lumin., 125, 201 – 215, (2007).
29 Flores-Gonzalez, M.A., Ledoux, G., Roux, S., Lebbou, K., Perriat, P., Tillement, O.: Preparing nanometer scaled Tb-doped Y2O3 luminescent powders by the polyol method, J. Solid State Chem., 178, 989 – 997, (2005).
30 Dolo, J.J., Ntwaeaborwa, O.M., Terblans, J.J., Coetsee, E., Dejene, B.F., Biggs, M.M., Swart, H.C.: The effect of oxygen pressure on the structure, morphology and photoluminescence intensity of pulsed laser deposited Gd2O2S:Tb3+ thin film phosphor, Appl. Phys. A., 101, 655 – 659, (2010).
31 Dai, Q.L., Song, H.W., Wang, M.Y., Bai, X., Dong, B., Qin, R.F., Qu, X.S., Zhang, H.: Size and concentration effects on the photoluminescence of La2O2S:Eu3+ nanocrystals, J. Phys. Chem. C, 112, 19399 – 19404, (2008).
32 Wang, W., Li, Y.S.: Fabrication of Gd2O2S:Pr, Ce, F scintillation ceramics by pressureless sintering in nitrogen atmosphere, Int. J. Appl. Ceram. Technol., 12, 1 – 7, (2015).
33 Steven, J., Duclosa, C., Greskovicha, D.: Development of highlight TM scintillator for computed tomography medical imaging, Nucl. Instrum. Meth. A, 505, 68 – 71, (2003).
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