期刊
JOURNAL OF PHOTONICS FOR ENERGY
卷 1, 期 -, 页码 -出版社
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.3523314
关键词
organic light-emitting diodes; light extraction; outcoupling efficiency; surface plasmons; gratings
资金
- Elite Network of Bavaria through the international graduate school Materials Science of Complex Interfaces
- Deutsche Forschungsgemeinschaft
- Japan Society for the Promotion of Science
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
- Funding Program for World-Leading Innovative Research and Development on Science and Technology
- German Federal Ministry of Education and Research [FKZ 13N10474]
Organic light-emitting diodes (OLEDs) usually exhibit a low light-outcoupling efficiency of only 20%. Typically, more than 30% of the available power is lost to surface plasmons (SPs). Consequently, the overall efficiency could be strongly enhanced by recovering SP losses. Therefore, three suitable techniques for extracting SPs-index coupling, prism coupling, and grating coupling-are discussed from a theoretical point of view and investigated experimentally in simplified OLED-like structures. The basic physical processes are clarified by systematic variations of the involved layer thicknesses and by excited state lifetime measurements. In addition, the analysis of the results is supported by optical simulations based on a dipole model. Finally, the advantages and disadvantages of each method, their potential efficiency for recovering SP losses, as well as the applicability in OLEDs are compared. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3523314]
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