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Red and Near-Infrared Electroluminescences from Metal-Free Phthalocyanine |
| FAN Zhao-Qi1;CHENG Chuan-Hui1,2;YE Kai-Qi3;YU Shu-Kun2;HE Wei1; XIA Dao-Cheng1;GUO Zhen-Qiang2;SHENG Ren-Sheng1;WANG Xu3; DU Xi Guang4;DU Guo-Tong 1,2 |
| 1State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 1160232State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 1300123Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 1300124Faculty of Chemistry, Northeast Normal University, Changchun 130024 |
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FAN Zhao-Qi, CHENG Chuan-Hui, YE Kai-Qi et al 2008 Chin. Phys. Lett. 25 2261-2264 |
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Abstract Organic light emitting diodes are fabricated based on metal-free phthalocyanine (H2Pc) doped into tris-(8-hydroxyquinoline) aluminium (Alq3). The device structure is ITO/NPB (30nm)/Alq3: H2Pc(30nm)/BCP(20nm)
/Alq3(20 nm)/Al. In the light-emitting layers, H2Pc concentrations are varied from 0wt% to 100wt%. The emissions around 708nm and 800nm appear at low concentrations, while the emissions around 910nm and 930nm appear at high concentrations. The emissions around 708nm and 800nm are from H2Pc monomers. The emissions around 910nm and 930nm are from H2Pc aggregates. The dominant mechanism in the doped devices is direct charge
trapping.
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| Keywords:
78.60.Fi
78.55.Kz
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Received: 19 December 2007
Published: 31 May 2008
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