Aperiodic Porous Metasurface-Mediated Organic Semiconductor Fluorescence

Zeqing Shen, Kun Zhu, Deirdre M O'Carroll

Research output: Contribution to journalArticle

Abstract

Plasmonic metasurfaces exhibit localized electromagnetic properties that are highly relevant for light management in thin-film organic optoelectronic devices, such as organic light-emitting diodes and organic solar cells. However, the effectiveness of metasurfaces for light management in these devices is complicated by molecular orientation effects. Here, we study how the fluorescence emission from organic semiconducting polymers is modified by aperiodic porous metasurfaces. In particular, we identify the role that polymer molecular orientation plays in enhancing or diminishing the light management ability of the metasurface by comparing local- and large-area fluorescence intensity and fluorescence quantum efficiency enhancements, and by varying viewing angle, for three different semiconducting polymers. We find that the porous metasurfaces improve both the local and large-area quantum efficiency of semiconducting polymer films with more out-of-plane molecular chains by up to 414% and 53%, respectively, compared to planar metal surfaces, by extracting plasmonic surface waves and the Purcell effect. However, there are almost no enhancements to the fluorescence of semiconducting polymer films with predominantly in-plane chains. In fact, in this case, certain porous metasurfaces reduce local- and large-area quantum efficiency by up to 77% and 15%, respectively, due to enhanced ohmic losses. Experimental observations and supporting electromagnetic simulations show that fluorescence modification is also highly sensitive to viewing angle because the emission pattern of each semiconducting polymer is affected differently by the porous metasurfaces. Further, a local excitation enhancement factor of up to 65 is experimentally observed in the case of semiconducting polymer films with more out-of-plane chains and low extinction coefficient on the porous metasurfaces.

Original languageEnglish
Pages (from-to)1215-1227
Number of pages13
JournalACS Photonics
Volume5
Issue number4
DOIs
Publication statusPublished - Apr 18 2018

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Semiconducting polymers
Semiconductors
Semiconducting organic compounds
organic semiconductors
Polymers
Fluorescence
Semiconducting films
fluorescence
polymers
Quantum efficiency
Polymer films
Molecular orientation
Light
quantum efficiency
Electromagnetic Phenomena
augmentation
Organic polymers
Equipment and Supplies
Organic light emitting diodes (OLED)
molecular chains

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Aperiodic Porous Metasurface-Mediated Organic Semiconductor Fluorescence. / Shen, Zeqing; Zhu, Kun; O'Carroll, Deirdre M.

In: ACS Photonics, Vol. 5, No. 4, 18.04.2018, p. 1215-1227.

Research output: Contribution to journalArticle

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