王瑞雪,范昌君,杨晓晖.以聚乙烯亚胺作为电子注入层的聚合物发光器件特性研究[J].光电子激光,2015,26(4):649~654 |
以聚乙烯亚胺作为电子注入层的聚合物发光器件特性研究 |
Polymer LED using ethoxylated polyethylenimine as electron injection layer |
投稿时间:2014-12-14 |
DOI: |
中文关键词: 聚合物发光二极管(PLED) 传统结构 倒置结构 聚乙烯亚胺(PEIE) 电子注入层(EIL ) |
英文关键词:polymer light emitting device (PLED) conventional devices inverted devices et h oxylated polyethylenimine (PEIE) electron injection layer (EIL) |
基金项目:国家自然科学基金(61177030,2)、教育部新世纪优秀人才(NCET-11-0705)和西南大学博士基金(SWU111057)资助项目 (西南大学 物理科学与技术学院,重庆 400715) |
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中文摘要: |
在传统结构与倒置结构的有机发光二极管(LED)的 聚合物发光层和阴极之间加入聚乙烯亚胺(PEIE)层能够显著地提高器件的发光效率。通过 采用不同厚度的PEIE层的器件发光特性研究表明:PEIE层作为电子注入层(EIL)/空穴阻挡层 (HBL)来平衡器件中的电子和空穴浓度,这主要来源于PEIE作为界面偶极层,能有效地降低 阴极与发光层之间的电子注入势垒。 |
英文摘要: |
To improve luminance efficiency of con ventional and inverted light emitting devices,we implement an ethoxylated polyet hylenimine (PEIE) layer between light emitting polymer and cathode. Studies on c haracterizations of light emitting devices with various PEIE layer thicknesses reveal that ethoxylated pol yethylenimine layer mainly works as an electron injection/hole blocking layer.Conventional and inverted light emitting devices using a PEIE electron injection layer show comparable luminance efficiency to the analogous devices with a CsF o r with a ZnO/PEIE electron injection layer.Analyses of current density-voltage characteristics of single-electron devices manifest that PEIE layer enhances electron injection efficiency by a fac tor of 5-10.Results of X-ray ph otoelectron-spectroscopy (XPS) meas urements indicate that PEIE layer reduces the work function of Al by ca. 1eV,thus significantly decreasing the e lectron injection barrier,which can be attributed to the intrinsic dipole moment of PEIE or the formation of interfacia l dipoles. Apart from excellent electron injection/hole blocking properties,PEIE is air-stable and more compatible with the neighboring organic layer than metal fluorides,which can be processed from aqueous or alcohol solution under a mbient conditions.Thus,PEIE serves as a promising electron injector in organic electron devices and is parti cularly suitable for construction of multilayer devices with versatile and enhan ced properties. |
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