Electromodulated photoinduced absorption : A new spectroscopy in π- conjugated polymer/C60 blends

Liess, Martin; Lane,  Paul A.; Kafafi,  Zakya H.; Hamaguchi, M.; Ozaki, Masanori; Yoshino, Katsumi; Vardeny, Z. Valy

doi:info:doi/10.1117/12.293356

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タイトル	Electromodulated photoinduced absorption : A new spectroscopy in π- conjugated polymer/C60 blends
著者	Liess, Martin Liess, Martin
	Lane, Paul A. Lane, Paul A.
	Kafafi, Zakya H. Kafafi, Zakya H.
	Hamaguchi, M. Hamaguchi, M.
	Ozaki, Masanori Ozaki, Masanori
	Yoshino, Katsumi Yoshino, Katsumi
	Vardeny, Z. Valy Vardeny, Z. Valy
キーワード等	Electromodulated photoinduced absorption (EPA)
	C60 doping
	Luminescence
	Electromodulated photoluminescence (EPL)
	Polaron pair polarizability
内容	Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States
内容	Martin Liess, Paul A. Lane, Zakya H. Kafafi, M. Hamaguchi, Masanori Ozaki, Katsumi Yoshino, and Z. Valy Vardeny "Electromodulated photoinduced absorption: a new spectroscopy in π-conjugated polymer/C60 blends", Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997). DOI: https://doi.org/10.1117/12.293356
抄録	We have applied the electromodulated photoinduced absorption (EPA) technique to a variety of C60-doped and pristine luminescent conducting polymer films. EPA measures the electric field-related change of the absorption in the sample as a result of above-gap illumination. An electric field leads to two major effects. One is a possible Stark shift of photoexcitation energy levels, and the other is a change in the photoexcitation decay kinetics, which leads to reduction or enhancement of PA features. This can be due to an electric field enhanced dissociation of the 1Bu exciton or due to a lifetime reduction of polaron pairs. The EPA technique helps to elucidate the photoinduced absorption bands of the charge transfer complex C60- P+, where P+ is a positively charged polaron on the polymer chain. The following thin films were studied by EPA: MEH-PPV/C60, pristine MEH-PPV, PPP/C60, P3OT/C60, PTSi/C60, and pristine PTSi. We found for the two PA bands of polarons that E(LE) + E(HE) equals Eg. We also found that the polarizability of polaron pairs in three orders of magnitude bigger that the polarizability of the 1Bu exciton.
公開者	SPIE
掲載誌名	Proceedings of SPIE - The International Society for Optical Engineering
巻	3142
開始ページ	150
終了ページ	160
刊行年月	1997-11-01
ISSN	0277786X
NCID	AA10619755
DOI (出版社版)	info:doi/10.1117/12.293356
URL	http://hdl.handle.net/11094/76956
言語	英語
カテゴリ	会議発表論文 Conference Paper

著者版フラグ	publisher
NII資源タイプ	会議発表論文
ローカル資源タイプ	会議発表論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Proceedings of SPIE - The International Society for Optical Engineering.3142 P.150-P.160
DC.title	Electromodulated photoinduced absorption : A new spectroscopy in π- conjugated polymer/C60 blends
DC.creator	Liess, Martin
	Lane, Paul A.
	Kafafi, Zakya H.
	Hamaguchi, M.
	Ozaki, Masanori
	Yoshino, Katsumi
	Vardeny, Z. Valy
DC.publisher	SPIE
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	1997-11-01
DC.identifier	info:doi/10.1117/12.293356
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/76956
DC.subject	Electromodulated photoinduced absorption (EPA)
	C60 doping
	Luminescence
	Electromodulated photoluminescence (EPL)
	Polaron pair polarizability
DC.description	Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States
DC.description	Martin Liess, Paul A. Lane, Zakya H. Kafafi, M. Hamaguchi, Masanori Ozaki, Katsumi Yoshino, and Z. Valy Vardeny "Electromodulated photoinduced absorption: a new spectroscopy in π-conjugated polymer/C60 blends", Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997). DOI: https://doi.org/10.1117/12.293356
DCTERMS.abstract	We have applied the electromodulated photoinduced absorption (EPA) technique to a variety of C60-doped and pristine luminescent conducting polymer films. EPA measures the electric field-related change of the absorption in the sample as a result of above-gap illumination. An electric field leads to two major effects. One is a possible Stark shift of photoexcitation energy levels, and the other is a change in the photoexcitation decay kinetics, which leads to reduction or enhancement of PA features. This can be due to an electric field enhanced dissociation of the 1Bu exciton or due to a lifetime reduction of polaron pairs. The EPA technique helps to elucidate the photoinduced absorption bands of the charge transfer complex C60- P+, where P+ is a positively charged polaron on the polymer chain. The following thin films were studied by EPA: MEH-PPV/C60, pristine MEH-PPV, PPP/C60, P3OT/C60, PTSi/C60, and pristine PTSi. We found for the two PA bands of polarons that E(LE) + E(HE) equals Eg. We also found that the polarizability of polaron pairs in three orders of magnitude bigger that the polarizability of the 1Bu exciton.
citation_title	Electromodulated photoinduced absorption : A new spectroscopy in π- conjugated polymer/C60 blends
citation_author	Liess, Martin
	Lane, Paul A.
	Kafafi, Zakya H.
	Hamaguchi, M.
	Ozaki, Masanori
	Yoshino, Katsumi
	Vardeny, Z. Valy
citation_publisher	SPIE
citation_language	英語
citation_date	1997-11-01
citation_journal_title	Proceedings of SPIE - The International Society for Optical Engineering
citation_volume	3142
citation_firstpage	150
citation_lastpage	160
citation_issn	0277786X
citation_doi	info:doi/10.1117/12.293356
citation_public_url	http://hdl.handle.net/11094/76956
citation_keywords	Electromodulated photoinduced absorption (EPA)
	C60 doping
	Luminescence
	Electromodulated photoluminescence (EPL)
	Polaron pair polarizability

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