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Enhanced hole injection in a hybrid organic-inorganic light-emitting diode

被引：23
作者：
Morii, Katsuyuki [1 ]
Omoto, Masayuki [1 ]
Ishida, Masaya [2 ]
Graetzel, Michael [3 ]
机构：
[1] Seiko Epson Corp, Nagano 3990293, Japan
[2] Epson UK Ltd, Cambridge Res Lab Epson, Cambridge CB4 0FE, England
[3] Swiss Fed Inst Technol, Sch Basic Sci, Inst Chem Sci & Engn, Lab Photon & Interfaces, CH-1015 Lausanne, Switzerland
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2008年 / 47卷 / 09期
关键词：
OLED; PLED; hybrid; encapsulation-free; hole injection; metal oxide; molybdenum oxide; XPS;
D O I：
10.1143/JJAP.47.7366
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The operating mechanism, particularly the carrier injection mechanism, of a hybrid organic-inorganic light-emitting diode (HOILED) is reported. Asymmetric hole injection has been observed in a symmetric hole-only device, which has two identical interfaces between a conducting polymer and a metal oxide. A HOILED having a layer of molybdenum oxide (MoO(3)) deposited on a layer of poly(dioctylfluorene-alt-benzothiadiazole) (F8BT) demonstrated a markedly enhanced hole injection, four orders of magnitude higher on one side of the structure than on the other side. This enhanced hole injection is the considered to initiate the operation of the HOILED. X-ray photoelectron spectra (XPS) analysis revealed that Mo deposited on the surface of F8BT was reduced compared to that deposited Mo below the film of F8BT. It is suggested that a chemical interaction between the metal oxide and the organic material affects carrier injection.
引用
收藏
页码：7366 / 7368
页数：3
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