Role of ultrathin Alq3 and LiF layers in conjugated polymer light-emitting diodes

Autor:	L. S. Hung, Yong Cao, Xianyu Deng, Yueqi Mo, S. W. Tong
Rok vydání:	2003
Předmět:	Conductive polymer Materials science Physics and Astronomy (miscellaneous) business.industry Bilayer Analytical chemistry Heterojunction Electroluminescence Cathode law.invention X-ray photoelectron spectroscopy law Optoelectronics Quantum efficiency business Light-emitting diode
Zdroj:	Applied Physics Letters. 82:3104-3106
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.1571654
Popis:	We report that an ultrathin layer of tris-(8-hydroxyquinoline) aluminum (Alq3) interposed between a bilayer cathode of LiF/Al and an emissive layer can significantly improve electroluminescence efficiency in a polymer light-emitting device (PLED). At a current density of 35 mA/cm2, a poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenyl-enevinylene] (MEH-PPV)-based PLED with a cathode of Alq3/LiF/Al has a quantum efficiency of 2.5%, considerably higher than that of a MEH-PPV-based PLED with a bare Al or a LiF/Al cathode. Interfacial characteristics of MEH-PPV/LiF/Al and MEH-PPV/Alq3/LiF/Al were investigated by photoelectron spectroscopy, and the results were used to explain the difference in device performance.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7b993724d8ee4fc46657ff2442c4c083 https://doi.org/10.1063/1.1571654 Zobrazit plný text záznamu