標題: 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
應用化學系
物理研究所
Department of Applied Chemistry
Institute of Physics
關鍵字: Quantum Dot;Nano-Composite;Organic Light Emitting Diode
公開日期: 1-Mar-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
起始頁: 2076
結束頁: 2080
Appears in Collections:Conferences Paper