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Near-Infrared Emission from Organic Light-Emitting Diodes Based on Copper Phthalocyanine with a Periodically Arranged Alq3:CuPc/DCM Multilayer structure |
| GUO Zhen-Giang1;CHENG Chuan-Hui2;FAN Zhao-Qi2;HE Wei2;YU Shu-Kun1;CHANG Yu-Chun1;DU Xi-Guang3;WANG Xu4;DU Guo-Tong 1,2 |
| 1State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 1300122State Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 1160243Department of Chemical, Northeast Normal University, Changchun 1300244State Key Laboratory of Supramolecular, Department of Chemical, Jilin University, Changchun 130012 |
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GUO Zhen-Giang, CHENG Chuan-Hui, FAN Zhao-Qi et al 2008 Chin. Phys. Lett. 25 715-718 |
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Abstract
We demonstrate near-infrared organic light-emitting devices with a periodically arranged tris(8-quinolinolato)alumi-num (Alq3):copper phthalocyanine (CuPc)/4-(dicyanomethylene)-2-methyl% -6-(4-dimethylaminost-yry)-4H-pyran (DCM) multilayer structure. DCM and Alq3 doped with CuPc were periodically deposited. Room-temperature electrophosphorescence was observed at about 1.1μm due to transitions from the first excited triplet state to the singlet ground state (T1-S0) of CuPc. In this device, we utilize the overlap between the Q band π-π* at about 625nm of the absorption spectra of CuPc and the PL spectra of the DCM. The near-infrared emission intensity of the CuPc-doped Alq3 device with DCM increases about 2.5 times larger than that of the device without DCM. We attribute the efficiency enhancement to the better overlap between the PL spectra of DCM and the absorption spectra of CuPc.
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| Keywords:
78.60.Fi
73.61.Ph
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Received: 14 September 2007
Published: 30 January 2008
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