Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules
Mixed host compositions that combine charge transport materials with luminescent dyes offer superior control over exciton formation and charge transport in organic light emitting devices (OLEDs). Two approaches are typically used to optimize the fraction of charge transport materials...
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| Format: | Article |
| Language: | en_US |
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American Institute of Physics (AIP)
2017
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| Online Access: | http://hdl.handle.net/1721.1/110708 https://orcid.org/0000-0001-6295-8087 https://orcid.org/0000-0003-2201-5257 |
| _version_ | 1826212269080444928 |
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| author | Kim, Jang-Joo Ha, Dong-Gwang Baldo, Marc A |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Kim, Jang-Joo Ha, Dong-Gwang Baldo, Marc A |
| author_sort | Kim, Jang-Joo |
| collection | MIT |
| description | Mixed host compositions that combine charge transport materials with luminescent dyes offer superior control over exciton formation and charge transport in organic light emitting devices (OLEDs). Two approaches are typically used to optimize the fraction of charge transport materials in a mixed host composition: either an empirical percolative model, or a hopping transport model. We show that these two commonly-employed models are linked by an analytic expression which relates the localization length to the percolation threshold and critical exponent. The relation is confirmed both numerically and experimentally through measurements of the relative conductivity of Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) :1,3-bis(3,5-dipyrid-3-yl-phenyl)benzene (BmPyPb) mixtures with different concentrations, where the TCTA plays a role as hole conductor and the BmPyPb as hole insulator. The analytic relation may allow the rational design of mixed layers of small molecules for high-performance OLEDs. |
| first_indexed | 2024-09-23T15:19:00Z |
| format | Article |
| id | mit-1721.1/110708 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:19:00Z |
| publishDate | 2017 |
| publisher | American Institute of Physics (AIP) |
| record_format | dspace |
| spelling | mit-1721.1/1107082022-10-02T02:07:05Z Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules Kim, Jang-Joo Ha, Dong-Gwang Baldo, Marc A Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Department of Materials Science and Engineering Ha, Dong-Gwang Baldo, Marc A Mixed host compositions that combine charge transport materials with luminescent dyes offer superior control over exciton formation and charge transport in organic light emitting devices (OLEDs). Two approaches are typically used to optimize the fraction of charge transport materials in a mixed host composition: either an empirical percolative model, or a hopping transport model. We show that these two commonly-employed models are linked by an analytic expression which relates the localization length to the percolation threshold and critical exponent. The relation is confirmed both numerically and experimentally through measurements of the relative conductivity of Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) :1,3-bis(3,5-dipyrid-3-yl-phenyl)benzene (BmPyPb) mixtures with different concentrations, where the TCTA plays a role as hole conductor and the BmPyPb as hole insulator. The analytic relation may allow the rational design of mixed layers of small molecules for high-performance OLEDs. United States. Dept. of Energy. Office of Basic Energy Sciences (DE-SC0001088) 2017-07-14T19:02:42Z 2017-07-14T19:02:42Z 2016-04 2016-01 Article http://purl.org/eprint/type/JournalArticle 2158-3226 http://hdl.handle.net/1721.1/110708 Ha, Dong-Gwang, Jang-Joo Kim, Marc A. Baldo. “Link Between Hopping Models and Percolation Scaling Laws for Charge Transport in Mixtures of Small Molecules.” AIP Advances 6, 4 (April 2016): 045221 © 2016 Author(s) https://orcid.org/0000-0001-6295-8087 https://orcid.org/0000-0003-2201-5257 en_US http://dx.doi.org/10.1063/1.4948591 AIP Advances Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf American Institute of Physics (AIP) American Institute of Physics (AIP) |
| spellingShingle | Kim, Jang-Joo Ha, Dong-Gwang Baldo, Marc A Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules |
| title | Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules |
| title_full | Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules |
| title_fullStr | Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules |
| title_full_unstemmed | Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules |
| title_short | Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules |
| title_sort | link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules |
| url | http://hdl.handle.net/1721.1/110708 https://orcid.org/0000-0001-6295-8087 https://orcid.org/0000-0003-2201-5257 |
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