期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 42, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/42/3/035101
关键词
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资金
- Korea Science and Engineering Foundation [R01-2005-000-10852-0]
- National Research Foundation of Korea [R01-2005-000-10852-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We demonstrate a novel light-emitting diode ( LED) of a graded bilayer structure that comprises poly(N-vinylcarbazole) (PVK) with good hole transport ability as the energy donor and a new distyrylanthracene-triazine-based dendrimer with enhanced electron transport ability as the light-emitting molecule. The device contains a graded bilayer structure of the PVK film covered with the dendrimer film prepared by sequential spin-casting of the dendrimer layer from a solvent that only swells the PVK layer. The bilayer device demonstrated a significantly enhanced electoluminescence quantum efficiency compared with the dendrimer single layer device or the PVK : dendrimer blend device with optimized composition. We also prepared composite LEDs with an MEH-PPV : emissive dendrimer blend. By doping the electron-deficient MEH-PPV layer with a small amount of the distyrylanthracene-triazine-based dendrimer, we could not only enhance the device performance but also depress the long-wavelength emission of MEH-PPV.
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