Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodesEffects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes
- Other Titles
- Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes
- Authors
- Lee, Hakjun; Hwang, Kyo Min; Kim, Ki Ju; Song, You Na; Kim, Young Kwan; Kim, Taekyung
- Issue Date
- 1-Jan-2022
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- Phosphor-sensitized-fluorescent OLEDs; phosphorescent sensitizer; charge balance; impedance spectroscopy
- Citation
- JOURNAL OF INFORMATION DISPLAY, v.23, no.1, pp.97 - 103
- Journal Title
- JOURNAL OF INFORMATION DISPLAY
- Volume
- 23
- Number
- 1
- Start Page
- 97
- End Page
- 103
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/21067
- DOI
- 10.1080/15980316.2021.2000514
- ISSN
- 1598-0316
- Abstract
- In phosphor-sensitized-fluorescent organic light-emitting diodes (PSF-OLEDs), triplet excitons generated in the emitting layer (EML) are harvested by the sensitizer and the excitonic energy is efficiently transferred to the fluorescent dopant molecules. Since a phosphorescent sensitizer is typically doped at around 10 wt.%, the sensitizer not only affects cascade energy transfer but also electrical transporting in the PSF-OLEDs. However, the electrical role of phosphorescent metal complex molecules in the EML is unclear. In this study, we report the impact of the phosphorescent sensitizer on the electrical properties of PSF-OLEDs. Through a comprehensive analysis using impedance spectroscopy in conjunction with current density (J)-voltage (V)-luminance (L) properties of the PSF-OLED, it was revealed that 10 wt.% phosphorescent sensitizer forms an electron transporting pathway inside the EML. Thus, the sensitizer molecules transform a unipolar single host into a bipolar mixed host. In other words, the phosphorescent sensitizer is an n-type host in the PSF-OLEDs. As a result, the charge balance and the operating voltage were simultaneously and significantly improved in the PSF-OLEDs.
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