Plasmonic Purcell effect reveals obliquely ordered phosphorescent emitters in Organic LEDs

Abstract The non-isotropic alignment of molecules can increase the interaction efficiency with propagating light fields. This applies to both emissive and absorptive systems and can be exploited for achieving unprecedented efficiencies of organic opto-electronic devices such as organic light-emittin...

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Autores principales:	R. Mac Ciarnain, D. Michaelis, T. Wehlus, A. F. Rausch, S. Wehrmeister, T. D. Schmidt, W. Brütting, N. Danz, A. Bräuer, A. Tünnermann
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4ef1e337e7c64e3dbc5dd6ed2e51de52
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spelling	oai:doaj.org-article:4ef1e337e7c64e3dbc5dd6ed2e51de522021-12-02T11:52:22ZPlasmonic Purcell effect reveals obliquely ordered phosphorescent emitters in Organic LEDs10.1038/s41598-017-01701-82045-2322https://doaj.org/article/4ef1e337e7c64e3dbc5dd6ed2e51de522017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01701-8https://doaj.org/toc/2045-2322Abstract The non-isotropic alignment of molecules can increase the interaction efficiency with propagating light fields. This applies to both emissive and absorptive systems and can be exploited for achieving unprecedented efficiencies of organic opto-electronic devices such as organic light-emitting diodes. Optical analysis has revealed certain phosphorescent emitters to align spontaneously in an advantageous orientation. Unfortunately, established approaches only determine an average orientation because emission patterns solely depend on the second moments of the transition dipole vector distribution. In order to resolve further details of such a distribution, additional differences in the emission characteristics of parallel and perpendicularly oriented emitters need to be introduced. A thin metal layer near the emitters introduces plasmon mediated losses mostly for perpendicular emitters. Then, analyzing the emission at different polarizations allows one to measure emission lifetimes of mostly parallel or mostly perpendicular oriented emitters. This should alter the transient emission when observing the temporal phosphorescence decay under different directions and/or polarizations. The angular width of the orientation distribution can be derived from the degree of such lifetime splitting. Our results suggest a narrow but obliquely oriented molecular ensemble of Ir(MDQ)2(acac) doped into the α-NPD host inside an Organic LED stack.R. Mac CiarnainD. MichaelisT. WehlusA. F. RauschS. WehrmeisterT. D. SchmidtW. BrüttingN. DanzA. BräuerA. TünnermannNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q R. Mac Ciarnain D. Michaelis T. Wehlus A. F. Rausch S. Wehrmeister T. D. Schmidt W. Brütting N. Danz A. Bräuer A. Tünnermann Plasmonic Purcell effect reveals obliquely ordered phosphorescent emitters in Organic LEDs
description	Abstract The non-isotropic alignment of molecules can increase the interaction efficiency with propagating light fields. This applies to both emissive and absorptive systems and can be exploited for achieving unprecedented efficiencies of organic opto-electronic devices such as organic light-emitting diodes. Optical analysis has revealed certain phosphorescent emitters to align spontaneously in an advantageous orientation. Unfortunately, established approaches only determine an average orientation because emission patterns solely depend on the second moments of the transition dipole vector distribution. In order to resolve further details of such a distribution, additional differences in the emission characteristics of parallel and perpendicularly oriented emitters need to be introduced. A thin metal layer near the emitters introduces plasmon mediated losses mostly for perpendicular emitters. Then, analyzing the emission at different polarizations allows one to measure emission lifetimes of mostly parallel or mostly perpendicular oriented emitters. This should alter the transient emission when observing the temporal phosphorescence decay under different directions and/or polarizations. The angular width of the orientation distribution can be derived from the degree of such lifetime splitting. Our results suggest a narrow but obliquely oriented molecular ensemble of Ir(MDQ)2(acac) doped into the α-NPD host inside an Organic LED stack.
format	article
author	R. Mac Ciarnain D. Michaelis T. Wehlus A. F. Rausch S. Wehrmeister T. D. Schmidt W. Brütting N. Danz A. Bräuer A. Tünnermann
author_facet	R. Mac Ciarnain D. Michaelis T. Wehlus A. F. Rausch S. Wehrmeister T. D. Schmidt W. Brütting N. Danz A. Bräuer A. Tünnermann
author_sort	R. Mac Ciarnain
title	Plasmonic Purcell effect reveals obliquely ordered phosphorescent emitters in Organic LEDs
title_short	Plasmonic Purcell effect reveals obliquely ordered phosphorescent emitters in Organic LEDs
title_full	Plasmonic Purcell effect reveals obliquely ordered phosphorescent emitters in Organic LEDs
title_fullStr	Plasmonic Purcell effect reveals obliquely ordered phosphorescent emitters in Organic LEDs
title_full_unstemmed	Plasmonic Purcell effect reveals obliquely ordered phosphorescent emitters in Organic LEDs
title_sort	plasmonic purcell effect reveals obliquely ordered phosphorescent emitters in organic leds
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/4ef1e337e7c64e3dbc5dd6ed2e51de52
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Plasmonic Purcell effect reveals obliquely ordered phosphorescent emitters in Organic LEDs

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