Abstract
Europium β-diketonate complexes Eu x Re(1−x)(TTA)3Phen, (Re = Y/Tb, TTA: thenoyl trifluro acetone, Phen: 1–10 Phenanthroline; x = 0.5) have been molecularly doped in poly methyl methacrylate matrix to study the concentration effect on the optical properties such as optical absorption and photoluminescence spectra for four different amounts of weight % (10, 25, 50 and 60 %). All these doped complexes show strong absorption peaks at 334 and 280 nm attributed to n–π* and π–π* transitions of β-diketonate ligand TTA respectively. The close absorptivity of all the complexes is due to the same tris chelated core TTA. Among the three complexes doped in PMMA matrix Eu0.5Tb0.5(TTA)3Phen complex shows hyper chromic shift with enhancement in the luminescent intensity. Enhancement of red light emission have been observed with the increase in wt% of all pure and doped systems in the order of Eu(TTA)3Phen, < Eu0.5Y0.5(TTA)3Phen < Eu0.5Tb0.5(TTA)3Phen. It has been observed that their PL intensity increases in the order of 10 > 25 > 50–60 %. However the luminescence intensity of these blended films with 50 and 60 % of rare earth complexes shows nearly equal value, indicating that the optimal doping concentration is about 50 % under the chosen experimental conditions. Hence these complexes are best suitable in fabricating eco-friendly organic light-emitting devices and displays by solution techniques, which can be operated at very low voltage.
References
P Jiang, W Zhu, Z Gan, W Huang, J Li, H Zeng and J Shi J. Mater. Chem. 19 4551–4556 (2009)
J Xie, C Chen, S Chen, Y Yang, M Shao, X Guo, Q Fan, and W Huang Org. Electron. 12 322–328 (2011)
U Mitschke and P Bauerle J. Mater. Chem. 10 913 (2000)
T Shimoda, Y Matsuki, M Furusawa, T Aoki, I Yudasaka, H Tanaka, H Iwasawa, D Wang, M Miyasaka, and Y Takeuchi Nature 440 783 (2006).
L Jiang, Y Fu, H Li, and W Hu J. Am. Chem. Soc. 130 3937 (2008).
M Wang, Y-L Yang, K Deng, and C Wang J. Phys. Chem. C 111 6194 (2007).
R Grover, R Srivastava1, O Rana1, D S Mehta, M N Kamalasanan J. Encapsulation Adsorpt. Sci. 1 23–28 (2011)
S Ye, F Xiao, Y X Pan, Y Ma and Q Y Zhang Mater. Sci. Eng. 71 1–34 (2010).
J Guifang, Y Hun, L Chen, X Wang, Z Mu, H Wu and F Kang Optics Laser Technol. 44 39–42 (2012)
L Kumar, R R Koireng, A Mishra, P Kumar, S K Dhawan, M N Kamalasanan and S Chandra Indian J. Pure Appl. Phys. 43 56–59 (2005).
R Srivastava, G Chauhan, K Saxena, S S Bawa, P C Srivastava and M N Kamalasanan Indian J. Pure Appl. Phys. 47(1) 19–23 (2009).
N Thejo kalyani, S J Dhoble, R B Pode Adv. Mat. Lett. 2(1) 65–70 (2011)
J S Park, M Song, Y-S Gal, J W Lee, S-H Jin Synth. Metals 161 213–218 (2011)
L Guang J. Lumin. 131 184–189 (2011)
H Jiu J Non Cryst. Solids 352 197–202 (2006)
Y X Ci and Z H Lan Analyst 113 1453 (1988).
J Bhadra and D Sarkar Indian J. Phys. 84 693 (2010)
A Karmakar and A Ghosh Curr. Appl. Phys. 12 539 (2012)
A Karmakar and A Ghosh J. Appl. Phys. 110 034101 (2011)
A K Nath, M Deka and A Kumar Indian J. Phys. 84 1307 (2010)
A Karmakar and A Ghosh Phys. Rev. E 84 051802 (2011)
S Bhattacharya and A Ghosh J. Nanosci. Nanotechnol. 8 1922 (2008)
M Deka, A K Nath and A Kumar Indian J. Phys. 84 1299 (2010)
A Karmakar and A Ghosh J. Appl. Phys. 107 104113 (2010)
N Misra, H S Panda, G Kapusetti, S Jaiswal and S Bhattacharya Indian J. Phys. 85 271 (2011)
S Chaudhary and R J Sengwa Indian J. Phys. 85 1591 (2011)
N Thejo kalyani, S J Dhoble, R B Pode J. Korean Phys. Soc. 57 746–751 (2010)
S Morita, T Akashi, A Fujji, M Yoshida, Y Ohmori, K Yoshimato, T Kawai, A A Zakhidov, S B Lee and K Yoshino Synth. Met. 69 433 (1995).
T Foster Ann. Phys. 2 55 (1948)
G Zhong and K Yang Langmiur 14 5502 (1998).
M Metlay J. Electrochem Soc. 111 1253 (1964).
G A Crosby, R E Whan and R M Alire J. Chem. Phys. 34 743 (1961).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Thejo Kalyani, N., Dhoble, S.J. & Pode, R.B. Enhancement of photoluminescence in various Eu x Re(1−x)TTA3Phen (Re = Y, Tb) complexes molecularly doped in PMMA. Indian J Phys 86, 613–618 (2012). https://doi.org/10.1007/s12648-012-0094-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12648-012-0094-2