Influence of pH Values on the Morphology and Down-Conversion Luminescence Properties of Zinc Tungstate Micro Nano Crystal Synthesized by a Hydrothermal Method

Abstract:

As the raw materials of Na₂WO₄•2H₂O and ZnSO₄•7H₂O, ZnWO₄ micron spheres and nanorods were synthesized with CH₃COOH as the complexing agent by a hydrothermal method at 180 °C for 24h. We analyzed the effect of different pH values in reaction solutions on phase compositions, morphologies and luminescent properties of the ZnWO₄ powders. The as-synthesized products were characterized by XRD and SEM. The down-conversion spectrum was measured with spectrophotometer under the excitation wavelength of 291nm. The results indicated that there was a wide emission peaks at 400~550nm. The luminescent intensities of ZnWO₄ nanorods synthesized at pH value of 9, 10 and 11 were much stronger than that of ZnWO₄ micron spheres synthesized between the pH values of 4 to 8.

• Periodical: Applied Mechanics and Materials (Volumes 599-601)
• Pages: 58-62
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.599-601.58
• Online since: August 2014
• Authors: Hui Wang, Lian Li Liu*, Bing Hou, Jun Jiao Kou, Li Li Wang
• Keywords: Down-Conversion Luminescence, Hydrothermal, pH Value, Zincum Tungstate

References

[1] Yuhua Zheng, Yeju Huang, Mei Yang, et al. Synthesis and tunable luminescence properties of monodispersed sphere-like CaWO4 and CaWO4: Mo/Eu, Tb. J. Journal of Luminescence, 2012, 2(132): 362-367.

DOI: 10.1016/j.jlumin.2011.09.010

[2] Yanhua Shen, Wen Li, Taohai Li. Microwave-assisted synthesis of BaWO4 nanoparticles and its photoluminescence properties. J. Materials Letters, 2011, 19-20(65): 2956-2958.

DOI: 10.1016/j.matlet.2011.06.033

[3] Jing Yan, Yanhua Shen, Rong Cao, et al. CdWO4 nanorods: Ultrafast synthesis via a PEG-1000 polymer-assisted enhanced microwave synthesis route and their photoluminescence property. J. Ceramics International, 2014, 6(40): 8081-8085.

DOI: 10.1016/j.ceramint.2014.01.003

[4] Xiaohong Yi, Jianchang Yu, et al. Hydrothermal preparation and luminescence of CdWO4 nanorods. J. Journal of the Chinese Ceramic Society, 2010, 38(2): 212-214.

[5] Gang Fang, Ying Xiong, Yuanlin Zhou. Investigation of Synthesis and Luminescent Properties of Y3+ Doped PbWO4 Microcrystals. J. Materials Review B：Research, 2011, 25(11): 20-24.

[6] Tatjana D. Savic´, Ivana Lj. Validzˇic ´, Tatjana B. Novakovic, et al. A Synergy of ZnO and ZnWO4 in Composite Nanostructures Deduced from Optical Properties and Photocatalysis. J. Journal of Cluster Science, 2013, 3(24): 679-688.

DOI: 10.1007/s10876-013-0562-7

[7] Ivana Lj. Validžić, Tatjana D. Savić, Radenka M. Krsmanović, et al. Synthesis, strong room-temperature PL and photocatalytic activity of ZnO/ZnWO4 rod-like nanoparticles. J. Materials Science and Engineering: B, 2012, 5(177): 645-651.

DOI: 10.1016/j.mseb.2012.03.044

[8] Kuisheng Yang, Xun Bai. Preparation and Luminescence Property of ZnWO4: Er3+, Yb3+ Nanorods. J. Chinese Journal of Inorganic Chemistry, 2010, 6(26): 1079-1082.

[9] Caina Jiang, Rongfang Wang, Tao He, et al. Preparation and Photoluminescence Properties of SiO2@ZnWO4: Eu3+ Phosphor. J. ChineseRareEarths, 2012, 5(32): 89-90.

[10] Xiaowei Zhang, liyun Cao, et al. Influence of Reaction Time on Morphology and Optical Property of ZnWO4 Nanocrystallites Prepared by Microwave Hydrothermal Process. J. Journal of the Chinese Ceramic Society, 2012, 40(9): 1332-1334.