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

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...

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Autores principales:	Hakjun Lee, Kyo Min Hwang, Ki Ju Kim, You Na Song, Young Kwan Kim, Taekyung Kim
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	phosphor-sensitized-fluorescent oleds phosphorescent sensitizer charge balance impedance spectroscopy Computer engineering. Computer hardware TK7885-7895
Acceso en línea:	https://doaj.org/article/9ef6f4c0cd4e4922ae630fdde1bcb4ca
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spelling	oai:doaj.org-article:9ef6f4c0cd4e4922ae630fdde1bcb4ca2021-11-17T14:21:57ZEffects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes1598-03162158-160610.1080/15980316.2021.2000514https://doaj.org/article/9ef6f4c0cd4e4922ae630fdde1bcb4ca2021-11-01T00:00:00Zhttp://dx.doi.org/10.1080/15980316.2021.2000514https://doaj.org/toc/1598-0316https://doaj.org/toc/2158-1606In 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.Hakjun LeeKyo Min HwangKi Ju KimYou Na SongYoung Kwan KimTaekyung KimTaylor & Francis Grouparticlephosphor-sensitized-fluorescent oledsphosphorescent sensitizercharge balanceimpedance spectroscopyComputer engineering. Computer hardwareTK7885-7895ENJournal of Information Display, Vol 0, Iss 0, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	phosphor-sensitized-fluorescent oleds phosphorescent sensitizer charge balance impedance spectroscopy Computer engineering. Computer hardware TK7885-7895
spellingShingle	phosphor-sensitized-fluorescent oleds phosphorescent sensitizer charge balance impedance spectroscopy Computer engineering. Computer hardware TK7885-7895 Hakjun Lee Kyo Min Hwang Ki Ju Kim You Na Song Young Kwan Kim Taekyung Kim Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes
description	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.
format	article
author	Hakjun Lee Kyo Min Hwang Ki Ju Kim You Na Song Young Kwan Kim Taekyung Kim
author_facet	Hakjun Lee Kyo Min Hwang Ki Ju Kim You Na Song Young Kwan Kim Taekyung Kim
author_sort	Hakjun Lee
title	Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes
title_short	Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes
title_full	Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes
title_fullStr	Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes
title_full_unstemmed	Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes
title_sort	effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/9ef6f4c0cd4e4922ae630fdde1bcb4ca
work_keys_str_mv	AT hakjunlee effectsofthephosphorescentsensitizeronchargedynamicsindeepbluephosphorsensitizedfluorescentorganiclightemittingdiodes AT kyominhwang effectsofthephosphorescentsensitizeronchargedynamicsindeepbluephosphorsensitizedfluorescentorganiclightemittingdiodes AT kijukim effectsofthephosphorescentsensitizeronchargedynamicsindeepbluephosphorsensitizedfluorescentorganiclightemittingdiodes AT younasong effectsofthephosphorescentsensitizeronchargedynamicsindeepbluephosphorsensitizedfluorescentorganiclightemittingdiodes AT youngkwankim effectsofthephosphorescentsensitizeronchargedynamicsindeepbluephosphorsensitizedfluorescentorganiclightemittingdiodes AT taekyungkim effectsofthephosphorescentsensitizeronchargedynamicsindeepbluephosphorsensitizedfluorescentorganiclightemittingdiodes
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Effects of the phosphorescent sensitizer on charge dynamics in deep blue phosphor-sensitized-fluorescent organic light-emitting diodes

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