Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules
Abstract
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. Furthermore, the analytic relation may allow the rational design of mixed layers of small molecules for high-performance OLEDs.
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Seoul National Univ., Seoul (Korea)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Excitonics (CE)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Kwanjeong Educational Foundation; National Research Foundation of Korea (NRF)
- OSTI Identifier:
- 1262288
- Grant/Contract Number:
- SC0001088
- Resource Type:
- Accepted Manuscript
- Journal Name:
- AIP Advances
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 4; Journal ID: ISSN 2158-3226
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; organic light emitting-diodes; n-vinylcarbazole; hole transport; conduction; threshold; blends; mobility; systems; films; host; hopping transport; percolation; charged excitons; current density
Citation Formats
Ha, Dong -Gwang, Kim, Jang -Joo, and Baldo, Marc A. Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules. United States: N. p., 2016.
Web. doi:10.1063/1.4948591.
Ha, Dong -Gwang, Kim, Jang -Joo, & Baldo, Marc A. Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules. United States. https://doi.org/10.1063/1.4948591
Ha, Dong -Gwang, Kim, Jang -Joo, and Baldo, Marc A. Fri .
"Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules". United States. https://doi.org/10.1063/1.4948591. https://www.osti.gov/servlets/purl/1262288.
@article{osti_1262288,
title = {Link between hopping models and percolation scaling laws for charge transport in mixtures of small molecules},
author = {Ha, Dong -Gwang and Kim, Jang -Joo and Baldo, Marc A.},
abstractNote = {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. Furthermore, the analytic relation may allow the rational design of mixed layers of small molecules for high-performance OLEDs.},
doi = {10.1063/1.4948591},
journal = {AIP Advances},
number = 4,
volume = 6,
place = {United States},
year = {Fri Apr 29 00:00:00 EDT 2016},
month = {Fri Apr 29 00:00:00 EDT 2016}
}
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