| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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The Metal Intermediate Electrode: A Method to Improve the Current Efficiency of a Tandem Organic Light-Emitting Diode |
| ZHANG Yan-Fei, ZHAO Su-Ling**, XU Zheng |
1Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Beijing 100044
2Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044
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| Cite this article: |
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ZHANG Yan-Fei, ZHAO Su-Ling, XU Zheng 2013 Chin. Phys. Lett. 30 057801 |
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Abstract We prepare a tandem (OLED) with two independent units and three electrodes. One of the units consists of ITO/TPD/Alq3:DCJTB (5%)/LiF/Al/Au, and the other is Al/Au/TPD/Alq3/LiF/Al. Two units sharing one transparent intermediate electrode Al/Au, together constitute the entire device. With the same current density, the voltage of the entire device is approximately equal to the sum of two units. The current efficiency of the entire device is several times higher than the sum up of two components. Without directly contacting an external power supply, the bi-metal intermediate electrode has the ability to produce electrons and holes for two adjacent emitting units, respectively. This kind of tandem device is characterized by controllable emission color and higher current efficiency than its two components added up.
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Received: 17 December 2012
Published: 31 May 2013
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