Abstract
The present work reports on the preparation of thin films of pyrene luminophors doped by varying amounts of perylene by spin coating technique. The structural, morphological, and photophysical properties of pyrene thin films have been investigated as a function of perylene contents. X-ray diffraction studies of doped thin films show well-defined peaks, and estimated crystallite size decreases with increasing perylene content, due to the formation of closed packed crystal structure. SEM images of pure pyrene revealed smooth, and compact and separated crystals with amounts of perylene. The result of absorption spectra showed decrease in intensity with perylene content. However, the fluorescence spectra of pyrene containing higher amounts of perylene showed broad and structureless exciplex emission at 510 nm. The emission colour of pyrene luminophors tuned from blue to green by controlling the concentration of perylene. The phenomenon of change in colour was seen due to efficient excitation energy transfer from pyrene to perylene in thin films. It also found that the intensity of exciplex emission increases with increasing concentration of perylene is of high demand in fluorescent lamp as well as green organic light emitting diodes.
Similar content being viewed by others
References
Lussem B, Riede M, Leo K (2012) Doping of organic semiconductors. Phys Status Solidi A 210:9
Lussem B, Tietze ML, Kleemann H, Hobach C, Bartha JW, Zakhidov A, Leo K (2014) Doped organic transistors operating in the inversion and depletion regime. Nat Commun 4:2775
Ohtani N, Majima S (2013) Improved dark current properties in bi-layer structured organic photodetectors. Adv Mater Res 650:54–57
Matsukawa K, Watanabe M, Hamada T, Nagase T, Naito H (2012) Polysilsesquioxanes for gate-insulating materials of organic thin-film transistors. Int J Polym Sci 2012:1–10
Ling MM, Bao Z (2004) Thin film deposition, patterning, and printing in organic thin film transistors. Chem Mater 16:4824–4840
Tang C, Van Slyke S (1987) Organic electroluminescent diodes. Appl Phys Lett 51:913–915
Basu BJ, Anandan C, Rajam KS (2003) Study of the mechanism of degradation of pyrene-based pressure sensitive paints. Sensors Actuatos B Chem 94:257–266
Wang L, Zhao XJ (2011) Dynamic research of a potential carrier for hydrophobic compound model pyrene using amphiphilic peptide EYK. Bull Kor Chem Soc 32:620–624
Stevens B, Hutton E (1960) Radiative life-time of the pyrene dimer and the possible role of excited dimers in energy transfer processes. Nature 186:1045–1046
Paris PL, Langenhan JM, Kool ET (1998) Probing DNA sequences in solution with a monomer-excimer fluorescence color change. Nucleic Acids Res 26:3789–3793
Berkovic GE, Ludmer Z (1983) Exciplex and heteroexcimer emission from pyrene crystals doped with anthracene derivatives. Chem Phys Lett 100:102–104
Patil SR (1995) Some new aspects of luminescence in perylene doped pyrene. Indian J Chem Sect A 34:102
Kawaoka K, Kearns DR (1964) Emission properties of tetracene-pyrene and pentacene-pyrene mixed crystals. J Chem Phys 41:2095–2097
Gharge MN, Bhattar SL, Kolekar GB, Patil SR (2008) Structural and photophysical aspects of perylene- doped anthracene crystalline powders prepared by microwave heating. Indian J Chem Sect A 47:1642–1648
Jung HT, Kim SO, Ko YK, Yoon DK, Hudson SD, Per-cec V, Holerca MN, Cho WD, Mosier PE (2002) Surface order in thin films of self-assembled columnar liquid crystals. Macromolecules 35:3717–3721
Belanger S, Keefe MH, Welch JL, Hupp JT (1999) Rapid derivatization of mesoporous thin-film materials based on Re(I) zinc-porphyrin ‘molecular squares’: selective modification of mesopore size and shape by binding of aromatic nitrogen donor ligands. Coord Chem Rev 190:29–45
Patwari SR, Basser MA, Vartale SP, Patil SR (2002) X-ray diffraction study of organic mixed crystals. Asian J Chem 14:57–61
Desai NK, Mahajan PG, Bhopate DP, Dalavi DK, Kamble AA, Gore AH, Dongale TD, Kolekar GB, Patil SR (2018) Studies on structural, optical, thermal and electrical properties of perylene-doped p-terphenyl luminophors. J Fluoresc 28:51–63
Acknowledgements
One of the author (NKD) gratefully acknowledge Department of Science and Technology and University Grants Commission, New Delhi, for providing grants to the Department of Chemistry, Shivaji University, Kolhapur, under FIST and SAP programs, respectively.
Author information
Authors and Affiliations
Corresponding authors
Rights and permissions
About this article
Cite this article
Desai, N.K., Mahajan, P.G., Mali, S.S. et al. Enhanced Exciplex Emission of Pyrene Thin Films Doped by Perylene: Structural, Photophysical and Morphological Investigation. J Fluoresc 28, 897–903 (2018). https://doi.org/10.1007/s10895-018-2252-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10895-018-2252-1