Browse > Article

Synthesis and Characterization of Thermally Cross-linkable Hole Transporting Material Based on Poly(p-phenylenevinylene) Derivative  

Choi, Jiyoung (Division of Applied Chemical Engineering, Department of Polymer Engineering, Pukyong National University)
Lee, Bong (Division of Applied Chemical Engineering, Department of Polymer Engineering, Pukyong National University)
Kim, Joo Hyun (Division of Applied Chemical Engineering, Department of Polymer Engineering, Pukyong National University)
Publication Information
Applied Chemistry for Engineering / v.19, no.3, 2008 , pp. 299-303 More about this Journal
Abstract
A thermally cross-linkable polymer, poly[(2,5-dimethoxy-1,4-phenylenevinylene)-alt-(1,4-phenylenevinylene)] (Cross-PPV), was synthesized by the Heck coupling reaction. In order for the polymer to be cross-linkable, 20 mol% excess divinylbenzene was added. The chemical structure of Cross-PPV and thermally crosslinked Cross-PPV were confirmed by FT-IR spectroscopy. From the FT-IR, UV-Vis, and PL spectral data, thermally crosslinked Cross-PPV was insoluble in common organic solvents. The HOMO and LUMO energy level of thermally cross-linked Cross-PPV were estimated -5.11 and -2.56 eV, respectively, which were determined by the cyclic voltammetry and UV-Vis spectroscopy. From the energy level data, one can easily notice that thermally crosslinked Cross-PPV can be used for hole injection layer effectively. Bilayer structured device (ITO/crosslinked Cross-PPV/PM-PPV/Al) was fabricated using poly(1,4-phenylenevinylene-(4-dicyanomethylene-4H-pyran)-2,6-vinylene-1,4-phenylenevinylene-2,5-bis(dodecyloxy)-1,4-phenylenevinylene (PM-PPV) as the emitting layer, which have HOMO and LUMO energy levels of -5.44 eV and -3.48 eV, respectively. The bilayered device had much enhanced the maximum efficiency (0.024 cd/A) and luminescence ($45cd/m^2$) than those of a single layer device (ITO/PM-PPV/Al, 0.003 cd/A, $3cd/m^2$). The enhanced performance originated from that fact that cross-linked Cross-PPV facilitatse the hole injection to the emissive layer and the injected hole and electron from ITO and Al are recombined in emitting layer (PM-PPV) effectively.
Keywords
polymer light-emitting diode (PLED); thermally crosslink; hole injection layer; mutilayer structured EL device; PPV; insoluble;
Citations & Related Records

Times Cited By SCOPUS : 1
연도 인용수 순위
1 G. Gustafsson, Y. Cao, G. M. Treacy, F. Klavetter, N. Colaneri, and A. J. Heeger, Nature, 357, 477 (1992)   DOI
2 Y.-H. Niu, Y.-L. Tung, Y. Chi, C.-F. Shu, J. H. Kim, B. Chen, J. Luo, A. J. Carty, and A. K.-Y. Jen, Chem. Mater., 17, 3532 (2005)   DOI   ScienceOn
3 B. Lim, J.-T. Hwang, J. Y. Kim, J. Ghim, D. Vak, Y.-Y. Noh, S.-H. Lee, K. Lee, A. J. Heeger, and D.-Y. Kim, Org. Lett., 8, 4703 (2006)   DOI   ScienceOn
4 J. C. Scott, J. H. Kaufman, P. J. Brock, R. DiPietro, J. Salem, and J. A. Goitia, J. Appl. Phys., 79, 2745 (1996)   DOI
5 J. H. Kim and H. Lee, Synth Met., 144, 169 (2004)   DOI   ScienceOn
6 J. H. Kim and H. Lee, Synth Met., 144, 193 (2004)   DOI   ScienceOn
7 S. Karg, J. C. Scott, J. R. Salem, and M. Angelopoulos, Synth.Met., 80, 111 (1996)   DOI   ScienceOn
8 J. Lee, B.-J. Jung, J.-I. Lee, H. Y. Chu, L.-M. Do, and H.-K. Shim, J. Mater. Chem., 12, 3494 (2002)   DOI   ScienceOn
9 J. H. Kim and H. Lee, Chem. Mater., 14, 2270 (2002)   DOI   ScienceOn
10 J. Cui, Q. Huang, Q. Wang, and T. J. Marks, Langmuir, 17, 2051 (2001)   DOI   ScienceOn
11 J. H. Kim and H. Lee, Synth Met., 143, 13 (2004)   DOI   ScienceOn
12 S. A. Carter, T. Grizzi, S. Karg, P. J. Brock, and J. C. Scott, Appl. Phys. Lett., 70, 2067 (1997)   DOI   ScienceOn
13 J. H. Kim and H. Lee, Synth. Met., 139, 471 (2003)   DOI   ScienceOn
14 H. Neugebauer, C. J. Brabec, J. C. Hummelen, R. A. J. Janssen, and N. S. Saricifti, Synth. Met., 102, 1002 (1999)   DOI   ScienceOn
15 U. S. Patent 2,317,052 (1965)