期刊
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
卷 7, 期 -, 页码 47-52出版社
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.7.5
关键词
activation energy; impedance spectroscopy; organic light-emitting device
资金
- Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic
- Slovak Academy of Sciences [1/0776/15]
- Slovak Research and Development Agency [APVV-14-0739, APVV-14-0740]
The charge behavior of organic light emitting diode (OLED) is investigated by steady-state current-voltage technique and impedance spectroscopy at various temperatures to obtain activation energies of charge injection and transport processes. Good agreement of activation energies obtained by steady-state and frequency-domain was used to analyze their contributions to the charge injection and transport. We concluded that charge is injected into the OLED device mostly through the interfacial states at low voltage region, whereas the thermionic injection dominates in the high voltage region. This comparison of experimental techniques demonstrates their capabilities of identification of major bottleneck of charge injection and transport.
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