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27.1: Invited Paper : High Efficiency Organic EL Devices having Charge Generation Layers
Author(s) -
Kido Junji,
Matsumoto Toshio,
Nakada Takeshi,
Endo Jun,
Mori Kohichi,
Kawamura Norifumi,
Yokoi Akira
Publication year - 2003
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1832444
Subject(s) - quantum efficiency , optoelectronics , materials science , electron , energy conversion efficiency , physics , nuclear physics
We have developed organic EL (OEL) devices, in which extremely high quantum efficiency of over 100% can be obtained. In order to generate more than one photons per injected electron, “Charge Generation Layers (CGLs)” are placed between emissive units. At CGLs, electrons and holes are generated upon voltage application, and injected to the adjacent organic emissive layers. By using one CGL and two emissive units, quantum efficiency can be doubled compared to the conventional OEL device, and using two CGLs and three emissive units, quantum efficiency can be tripled. One of the OEL device using two CGLs and three emissive units, an extremely high efficiency of 48 cd/A (ca. 14% external) was obtained, which exceeds the so‐called theoretical upper limit of 5%. Examples of such “multiphoton emission” (MPE) devices will be introduced.