标题: | Improved Efficiencies in Organic Light Emitting Diodes Made with CdSe/ZnS Quantum Dots and a Semiconducting Polymer |
作者: | Lee, Chih-Wen Yang, Sheng-Hsiung Hsu, Chain-Shu Meng, Hsin-Fei 应用化学系 物理研究所 Department of Applied Chemistry Institute of Physics |
关键字: | Quantum Dot;Nano-Composite;Organic Light Emitting Diode |
公开日期: | 1-三月-2009 |
摘要: | In this study, we report the fabrication and characterization of organic/inorganic hybrid polymer light emitting diodes (PLEDs) made with ZnS-capped CdSe core/shell type nanocrystals and a light-emitting polymer poly[2-phenyl-3-(9,9-dihexylfluoren-2-yl)-1,4-phenylene vinylene]-co-[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene]. The device using pristine polymer as active layer emitted yellow light with a maximum brightness of 3949 cd/m(2) and maximum external quantum efficiency of 0.27 cd/A at 10 V. After blending with the CdSe/ZnS quantum dots (QDs), the device showed a much higher brightness of 8192 cd/m(2) and external quantum efficiency of 1.27 cd/A at 7 V, while the driving voltage was lowered. The experimental results revealed that CdSe/ZnS QDs act as a hole-blocker in the devices. More efficient electron-hole recombination process inside polymer layer results in large improvement in luminescence and efficiency. |
URI: | http://dx.doi.org/10.1166/jnn.2009.419 http://hdl.handle.net/11536/12612 |
ISSN: | 1533-4880 |
DOI: | 10.1166/jnn.2009.419 |
期刊: | JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY |
Volume: | 9 |
Issue: | 3 |
起始页: | 2076 |
结束页: | 2080 |
显示于类别: | Conferences Paper |