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17 results on '"Song, You Na"'

3. Analysis and Diagnosis of the Buddhist Wall Paintings in the Josadang Shrine, Buseoksa Temple, Korea

Author

Lee, Hwa Soo, Song, You Na, Han, Gyu Seong, Han, Kyeong Soon, van den Berg, Klaas Jan, Series Editor, Burnstock, Aviva, Series Editor, Janssens, Koen, Series Editor, van Langh, Robert, Series Editor, Mass, Jennifer, Series Editor, Nevin, Austin, Series Editor, Lavedrine, Bertrand, Series Editor, Ormsby, Bronwyn, Series Editor, Strlic, Matija, Series Editor, Aoki, Shigeo, editor, Taniguchi, Yoko, editor, Rickerby, Stephen, editor, Mori, Michiyo, editor, Kijima, Takayasu, editor, Bomin, Su, editor, and Kirino, Fumiyoshi, editor

Published
2021
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10. Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes.

Author

Lee, Hakjun, Hwang, Kyo Min, Kim, Ki Ju, Song, You Na, Kim, Young Kwan, and Kim, Taekyung

Subjects
PHOSPHORESCENCE, ORGANIC light emitting diodes, LIGHT emitting diodes, ELECTRON transport, IMPEDANCE spectroscopy, ENERGY transfer, EXCITON theory
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. [ABSTRACT FROM AUTHOR]

Published
2022
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