Singlet Exciton Fraction in Electroluminescence from Conjugated Polymer

Abstract The efficiency of electrofluorescent polymer light-emitting diodes is determined by singlet exciton fraction (χS) formation and its value still remains controversial. In this work, χS in spiropolyfluorene (SPF) is determined by analyzing transient emission of phosphor-dopant probe. The χS i...

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Autores principales:	Tzu-Hao Jen, Show-An Chen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e781db6bfb9c40e9bd5866debdda55cc
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spelling	oai:doaj.org-article:e781db6bfb9c40e9bd5866debdda55cc2021-12-02T16:06:01ZSinglet Exciton Fraction in Electroluminescence from Conjugated Polymer10.1038/s41598-017-02115-22045-2322https://doaj.org/article/e781db6bfb9c40e9bd5866debdda55cc2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02115-2https://doaj.org/toc/2045-2322Abstract The efficiency of electrofluorescent polymer light-emitting diodes is determined by singlet exciton fraction (χS) formation and its value still remains controversial. In this work, χS in spiropolyfluorene (SPF) is determined by analyzing transient emission of phosphor-dopant probe. The χS is found to range from 50% to 76%, depending on applied voltage. Higher applied voltage gives larger χS. Besides, more rapid increment in χS with applied voltage is observed in the higher-molecular-weight polymer. The voltage or molecular weight dependence of χS suggests the probability of singlet exciton (SE) generation through triplet-triplet annihilation (TTA) is enhanced due to higher triplet exciton (TE) concentration at higher applied voltage or accommodation of more TEs in a polymer chain with high molecular weight, thereby increasing probability of TTA. At lower applied voltage, χS is contributed by charge recombination. Its value (χS ~50%) higher than the statistical limit 25% is in agreement with efficient interconversion between triplet and singlet polaron pairs (PP) and with larger formation rate of SE relative to that of TE.Tzu-Hao JenShow-An ChenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tzu-Hao Jen Show-An Chen Singlet Exciton Fraction in Electroluminescence from Conjugated Polymer
description	Abstract The efficiency of electrofluorescent polymer light-emitting diodes is determined by singlet exciton fraction (χS) formation and its value still remains controversial. In this work, χS in spiropolyfluorene (SPF) is determined by analyzing transient emission of phosphor-dopant probe. The χS is found to range from 50% to 76%, depending on applied voltage. Higher applied voltage gives larger χS. Besides, more rapid increment in χS with applied voltage is observed in the higher-molecular-weight polymer. The voltage or molecular weight dependence of χS suggests the probability of singlet exciton (SE) generation through triplet-triplet annihilation (TTA) is enhanced due to higher triplet exciton (TE) concentration at higher applied voltage or accommodation of more TEs in a polymer chain with high molecular weight, thereby increasing probability of TTA. At lower applied voltage, χS is contributed by charge recombination. Its value (χS ~50%) higher than the statistical limit 25% is in agreement with efficient interconversion between triplet and singlet polaron pairs (PP) and with larger formation rate of SE relative to that of TE.
format	article
author	Tzu-Hao Jen Show-An Chen
author_facet	Tzu-Hao Jen Show-An Chen
author_sort	Tzu-Hao Jen
title	Singlet Exciton Fraction in Electroluminescence from Conjugated Polymer
title_short	Singlet Exciton Fraction in Electroluminescence from Conjugated Polymer
title_full	Singlet Exciton Fraction in Electroluminescence from Conjugated Polymer
title_fullStr	Singlet Exciton Fraction in Electroluminescence from Conjugated Polymer
title_full_unstemmed	Singlet Exciton Fraction in Electroluminescence from Conjugated Polymer
title_sort	singlet exciton fraction in electroluminescence from conjugated polymer
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e781db6bfb9c40e9bd5866debdda55cc
work_keys_str_mv	AT tzuhaojen singletexcitonfractioninelectroluminescencefromconjugatedpolymer AT showanchen singletexcitonfractioninelectroluminescencefromconjugatedpolymer
_version_	1718385181706944512

Singlet Exciton Fraction in Electroluminescence from Conjugated Polymer

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