Structural and Optical Behavior of nanoCe₂(SO₄)₃, CeF₃ and CePO₄:Tb³⁺ Composites Embedded in PVOH Matrix

Abstract:

Embedding rare earth compounds and inorganic materials in polymer matrix are of great interest due to its various applications in sensors, optical batteries etc. The hydrated form of optical compounds possesses interest due to the possibility of crystal field effect on the electronic and magnetic field structure of the 4f shell. The stiochiometric cerium compounds have attracted attention due to its high temperature phase stability, high melting point, low thermal conductivity, optical fluorescence etc. In this paper we discuss the synthesis of cerrous sulphate Ce₂(SO₄)₃, Cerium fluoride CeF₃ and Cerium Phosphate doped with terbium Ce_1-xPO₄:Tb_x composites and dependence of their structural and optical behavior on particle size. Cerrous sulphate exists in several phases, mostly hydrated. In polymer composite the anhydrous phase of Ce₂(SO₄)₃ is observed. Also CePO₄ composites crystallize to monazite phase. The significant changes in Ce³⁺ emission and absorption spectra are observed due to this phase change. Cerium fluoride composites prepared with different concentration show three absorption peaks around 237, 275 and 265nm. The lower concentration of CeF₃ shows different absorption. CePO₄ composites doped with various concentrations of terbium shows intense green emission at 543 nm and maximum energy transfer for 10 mol % of Tb³⁺. The Ce³⁺ emission is shifted to 337nm. The S.E.M. photograph of the composite shows well separated particles with average size 300nm.

• Periodical: Advanced Materials Research (Volume 748)
• Pages: 117-122
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.748.117
• Online since: August 2013
• Authors: Aarti Muley, C.P. Joshi, R.R. Patil, S.V. Moharil
• Keywords: Cerium Fluoride, Cerium Phosphate, Cerrous Sulphate, Nanoparticle, Phase Change, Photoluminescence (PL)

References

[1] Rupali Gangopadhyay and Amitabha De, Chem. Mater. 12( 2000), 608.

[2] S. P Armes, S Gottesfeld,.J. G. Beery, F. Garzon and S.F. Agnew, Polymer, 32( 1991) 2325.

DOI: 10.1016/0032-3861(91)90068-t

[3] Masanori Tanaka J. lum 100 (2002) 163–173.

[4] D. Mohanty, S.S. Nath, N.C. Mishra and A. Choudhary Bull. Mat. Sci. 26 (2003) 289.

[5] Y. Barbara Keller, Janina Legendziewicz, Jan Przybylski, Mal«gorzata Guzik, Jacek Glinski J. Alloys Compds. 341 (2002) 197.

[6] G. Blasse Chem. Mater. 6(1994)1465.

[7] F.A. Kroger and J. Baker Physica B 7(1941) 628.

[8] Wenbo Bu, Hangrong Chen, Zile Hua, Zhicheng Liu, Weimin Huang, Lingxia Zhang, and Jianlin Shi Appl. Phys. letts. 85 (2004) 4307.

[9] R.C. Ropp, J. Electrochem. Soc., 115 (1968), 841.

[10] Tanaka, Masanori, J. Lumin. 100, (2001), 163.

[11] R. Bhargava Proc. of International Conference on Luminescence and its Applications, (2004), Mumbai, India.

[12] Aarti Muley, R.R. Patil and S.V. Moharil Proc. of National Conference on Luminescence and its Applications, (2006) Coimbatore , India.

[13] U. Ramababu Mater. Chem. Phys. 78 (2002) 160.