Structural and Optical Investigation of Novel Europium Hybrid Organic Complex for OLEDs and Solid State Lighting

Dipti Chitnis¹, N. Thejo Kalyani^2, and S.J. Dhoble¹

¹Department of Physics, RTM Nagpur University, Nagpur-440033, India

²Department of Applied Physics, Laxminarayan Institute of Technology, Nagpur-440033, India

Cite this paper:
Dipti Chitnis, N. Thejo Kalyani and S.J. Dhoble. Structural and Optical Investigation of Novel Europium Hybrid Organic Complex for OLEDs and Solid State Lighting. Journal of Materials Physics and Chemistry. 2017; 5(1):1-10. doi: 10.12691/jmpc-5-1-1

Abstract

We report the design and synthesis of volatile europium β-diketonate Eu(dmh)₃phen organic hybrid complex by precipitation technique. A series of complexes were synthesized for different pH values, ranging between 8.0 and 6.0 maintaining stoichiometric ratio. Among all the synthesized complexes, Eu(dmh)₃phen with pH 7 exhibits red intense emission at 613 nm with a sharp spectral bandwidth of 5 nm when excited at a wavelength of 372nm,infering that the synthesized complex is pH sensitive. This complex is further assessed for structural, thermal and luminescence behavior in various solvents. X-ray diffractogram reveals its crystalline nature and FTIR confirms the complete formation of the complex revealing the presence of TTA and bipy structure in the metal complex. TGA/DTA exhibits good thermal stability, which is highly essential for fabricating organic light emitting diodes (OLEDs) for solid state lighting. Hypsochromic shift was observed in the optical absorption spectra of Eu(dmh)₃phen, when the solvent is changed from basic to acidic media.

Keywords:
biodegradable europium solid state lighting OLEDs

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References:

[1]	N. Thejo Kalyani, S.J. Dhoble, “Importance of Eco-friendly OLED Lighting,” Defect and Diffusion Forum, Trans Tech Publications, Switzerland 357, (2014), 1-27.
[2]	N A.H. Male, Oleg V.Salata, Victor Christou, “Enhanced electroluminescent efficiency from spin-coated europium(III) organic light-emitting device”, Synth metals 12, (2002) 7-10.
[3]	H Liang, Fang Xie, “Photoluminescence study of a europium (III) complex containing 1, 5-styrylacetylacetone ligands”, Spectrhema Acta Part A, 77, (2010) 348-350.
[4]	L Zhang, Bin Li, “A series of Eu(III) emitters with a novel triphenylamine-derived beta-diketone ligand,” J Lumin 129(11), (2009) 1304-1308.
[5]	H Liang, Fang Xie, Xiaojun Ren, Yifa Chen, Biao Chen, Fuquan Guo. “Temperature dependent luminescence of a europium complex incorporated in poly(methyl methacrylate”, Spectrochem Acta Part A: Mol Bimol Spectro; 116, (2013) 317-320.
[6]	Melby, L. R. Rose, N. J. Abramson, E. Caris, J. C. “Synthesis and fluorescence of some trivalent lanthanide complexes,” J. Am. Chem. Soc., 86, 5117, (1964).
[7]	S Linfang, Li Yanwei, Cao Huaru, Guan Ying, Ma Yongchun, “Synthesis of novel europium complexes and their photoluminescence properties”, J. Rare Earths, 30(1), (2012) 17-20.
[8]	M. Fernandes, V. de Zea Bermudez, R. A. Sa´ Ferreira, L. D. Carlos, A. Charas, J. Morgado M. M. Silva,M. J. Smith,” Highly Photostable Luminescent Poly(ε-caprolactone)siloxane Biohybrids Doped with Europium Complexes,” Chem. Mater., 19(16), (2007). 3892-3901.
[9]	N. ThejoKalyani, S.J.Dhoble, “Novel materials for fabrication and encapsulation of OLEDs” Ren.Sus.Ene. Rev. 44, (2015) 319-347.
[10]	N.Thejo Kalyani, S.J. Dhoble and R.B. Pode. “Optical Properties of EuxRe(1−x)(TTA)3Phen Organic Complexes in Different Solvents” J. Kor Phys Soc. 57( 4), (2010) 746-751.
[11]	K. E, Fukuda .T, Kato .S, Honda .Z, Kamata. N. “pH and concentration dependence of luminescent characteristics in glass-encapsulated Eu-complex”, J Sol-Gel Sci Technol, 50(3), (2009) 409-414.
[12]	J.P.Coates, Á Review of sampling Methods For Infrared spectroscopy’in Applied Spectroscopy: a compact Reference for practitioners, eds. J.Workman A.W.Sprinsteen, Academic press New York, (1998) 49-91.
[13]	J.P.Coates, ‘Ínto the unknown: the first in the series’, Spectroscopy, 11(5), (1996) 32-39.