Color Tuning and Investigation of Mobility in Organic Light Emitting Diodes Based on Imidazoles Compounds

Document Type : Original Article

Authors

1 Faculty of Industrial Technologies, Urmia University of Technology, Band Road, Urmia, Iran

2 Faculty of Chemistry, University of Tabriz, Tabriz, Iran

Abstract

In this work, three imidazole compounds were synthesized as fluorescent materials for organic light-emitting diodes (OLEDs). In the step, single and multi-layers OLEDs using imidazole compounds have been fabricated.  The highest luminous efficiency was observed with the compound (1). Diode fabricated with thiophene increased efficiency with respect to other compounds. Also, in the electroluminescence spectrum of the phenyl ring, electroplex emission was achieved. The results show that the color of devices depends on functional groups. The effect of various thicknesses (90,100 and 150 nm) on the electron mobility of devices with space-charge-limited current (SCLC) method was investigated. The highest mobility at the optimum thickness of 90 nm was achieved.

Keywords

Main Subjects


1. L. J. Lai, C. S. Su, Luminescence excitation and near edge X-ray absorption spectra of Er2O3 dopant on zirconia ceramics. Mater. Chem. Phys. 62(2000), 148-152.
2. L. Huang, K. Tang, Q. Yang, G. Shen, S. Jia, Synthesis and characterization of ZrS3 nanocrystallites. Mater. Res. Bull. 39(2004), 1083-1089.
3. Y. Du, Q. Pan, J. Li, J. Yu, R. Xu, Synthesis, structure, and photoluminescence property of a new layered zirconium phosphate |Co(dien)2|[Zr4H8P5O26]·3H2O. Inorg. Chem. 46(2007), 5847-5851.
4. H. Shahroosvand, F. Nasouti, E. Mohajerani, A. Khabbazi, Red–yellow electroluminescence, yellow– green photoluminescence of novel N, O donor ligands–chelated zirconium (IV) complexes. Opt. Mater. 27(2005), 339-344.
5. B. Yan, Q. Xie, The Photophysical Properties of Quaternary Lanthanide (Eu3+, Tb3+, Sm3+, Dy3+) functional molecular complexes. Monatsh. Chem. 135(2004), 757-764.
6. م. جانقوری، ع. مهاجرانی، م. قلیپور اصل، پ. پناهیانفر، ساخت دیود نور گسیل آلی زرد و قرمز با اضافه کردن رنگینه به روش لایه‌‌نشانی تک بوته‌‌ای. نشریه علمی علوم و فناوری رنگ. (1399)14، 82-73.
7. م.ﺟﺎﻧﻘﻮری، ع. مهاجرانی، ز. ﻗﺎﺳﻤﯽ، ر. ﺳﻼﻣﺖ ﺑﺨﺶ، آ. اﺑﻮاﻟﻘﺎﺳﻤﯽ ﻓﺨﺮی، اﻟﮑﺘﺮوﻟﻮﻣﯿﻨﺴﻨﺲ ﺳﻔﯿﺪ ﻏﯿﺮ ﻋﺎدی دردﯾﻮد ﻧﻮر ﮔﺴﯿﻞ آﻟﯽ ﺑﺮ ﭘﺎﯾﻪ ﻣﺸﺘﻘﺎت اﯾﻤﯿﺪازولی. نشریه علمی علوم و فناوری رنگ. (1399)14، 222-215.
8. Y. Pan, A. Zheng, F. Hu, H. Xiao, Copolymers of s tyrene with a quaternary europium complex. J. Appl. Polym. Sci. 100(2006), 1506-1510.
9. م. حسین‌نژاد، س. مرادیان، ک. قرنجیگ، مروری بر سلول‌های خورشیدی دوپشته حساس شده به مواد رنگزا. نشریه علمی علوم و فناوری رنگ. (1395)4، 82-75.
10. C. D. B. Vandevyver, A.S. Chauvin, S. Comby, J. C. G. Bünzli, Luminescent lanthanide bimetallic triple stranded helicates as potential cellular imaging probes. Chem. Commun. 17(2007), 1716-1718.
11. R. J. Aarons, J. K. Notta, M. M. Meloni, J. Feng, R. Vidyasagar, J. Narvainen, S. Allan, N. Spencer, R. A. Kauppinen, J. S. Snaith, S. Faulkner, A luminescent probe containing a tuftsin targeting vector coupled to a terbium complex. Chem. Commun. 8(2006), 909-911.
12. L. N. Sun, J. B. Yu, H. J. Zhang, Q. G. Meng, E. Ma, C. Y. Peng, K. Y. Yang, Near-infrared luminescent mesoporous materials covalently bonded with ternary lanthanide [Er (III), Nd (III), Yb (III), Sm (III), Pr (III)] complexes. Chem. Mater. 17(2005), 156-165.
13. M. Janghouri, S. Minasian, M. Mahmoudi, S. Eyvazi, Photo/electroluminescence and electron transport properties of new zinc complexes. Opt. Mat. 89(2019), 488-493.
14. M. Pazoki, U.B. Cappel, E.M.J. Johansson, A. Hagfeldt, G. Boschloo, Characterization techniques for dye sensitized solar cells. J. Appl. Phyd. 141(2002), 672-709.
15.S. S. Lee, T. J. Song, S.M. Cho, Organic white-light-emitting devices based on balanced exciton-recombination-zone split using a carrier blocking layer. Mater. Sci. Eng. B. 95(2002), 24-28.
16. F. E. Gostev, L. S. Kol’tsova, A. N. Petrukhin, A. A. Titov, A. I. Shiyonok, N. L. Zaichenko, V. S. Marevtsev, O. M. Sarkisov, Spectral luminescent properties and dynamics of intramolecular processes in 2,4,5-triarylimidazoles. J. Photochem. Photobiol. A. 156(2003), 15-22.
17. P. Abhishek, C. J. Kulkarni, A. B. Tonzola, A. Samson, Electron transport materials for organic light-emitting diodes. J. Chem. Mater. 16 (2004), 4556-4573.
18. W. Lin, L. Long, L.Yuan, Z. Cao, B. Chen, W.Tan, A ratiometric fluorescent probe for cysteine and homocysteine displaying a large emission shift. Org. Lett. 10(2008), 5577-5580.
 19. M. M. Richter, Electrochemiluminescence. Chem. Rev. 104(2004), 3003-3036.
20. M. Janghouri, Electroluminescence and photoluminescence from a fluorescent cobalt porphyrin grafted on graphene oxide. J. Electron. Mater. 46(2017), 5635-5641.
21. R. H. Shoar, G. Rahimzadeh, F. Derikvand, M. Farzaneh, Four‐component, one‐ pot synthesis of tetrasubstituted imidazoles using a catalytic amount of MCM‐ 41 or p‐ TsOH. Syn. Com. 40(2010), 1270-1275.
22. X. Zhao, X. Zhan, Electron transporting semiconducting polymers in organic electronics. Chem. Soc. Rev. 40(2011), 3728-3743.