Correlation Between Charge Injection and Charge Balance in Organic Light Emitting Diodes Using LiF and IrOx Interlayers
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SCOPUS
- Title
- Correlation Between Charge Injection and Charge Balance in Organic Light Emitting Diodes Using LiF and IrOx Interlayers
- Authors
- Kim, SY; Hong, K; Choi, HW; Kim, KY; Tak, YH; Lee, JL
- Date Issued
- 2009-01
- Publisher
- ELECTROCHEMICAL SOC INC
- Abstract
- We report the correlation between charge injection and charge balance using lithium fluoride/aluminum (LiF/Al) cathode and iridium oxide (IrOx)-coated indium tin oxide (ITO) anode in organic light emitting diodes (OLEDs). The turn-on voltage decreased from 6.7 to 1.0 V and luminous efficiency at 80 mA/cm(2) increased from 1.24 to 4.60 cd/A due to the presence of LiF and the high work function of IrOx. When IrOx was used in the anode region, the luminous efficiency increment rate decreased from 40% in Al cathode OLED to 7% in LiF/Al cathode OLED. The value of the carrier density suggested that the majority carrier changed from electrons in ITO-LiF/Al OLEDs to holes in ITO/IrOx-LiF/Al OLEDs, reducing the rate of increase. Therefore, it has been considered that charge injection should be increased and balanced in order to maximize the luminous efficiency.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11176
- DOI
- 10.1149/1.3072699
- ISSN
- 0013-4651
- Article Type
- Article
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol. 156, no. 4, page. J57 - J61, 2009-01
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