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Title: Substrate temperature controls molecular orientation in two-component vapor-deposited glasses

Vapor-deposited glasses can be anisotropic and molecular orientation is important for organic electronics applications. In organic light emitting diodes (OLEDs), for example, the orientation of dye molecules in two-component emitting layers significantly influences emission efficiency. Here we investigate how substrate temperature during vapor deposition influences the orientation of dye molecules in a model two-component system. We determine the average orientation of a linear blue light emitter 1,4-di-[4-( N,N-diphenyl)amino]styrylbenzene (DSA-Ph) in mixtures with aluminum-tris(8-hydroxyquinoline) (Alq 3) by spectroscopic ellipsometry and IR dichroism. We find that molecular orientation is controlled by the ratio of the substrate temperature during deposition and the glass transition temperature of the mixture. Furthermore, these findings extend recent results for single component vapor-deposited glasses and suggest that, during vapor deposition, surface mobility allows partial equilibration towards orientations preferred at the free surface of the equilibrium liquid.
Authors:
 [1] ;  [2] ;  [1] ;  [2]
  1. Nanjing Univ., Nanjing (China)
  2. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Grant/Contract Number:
SC0002161
Type:
Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 12; Journal Issue: 13; Journal ID: ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Research Org:
Univ. of Wisconsin System, Madison, WI (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1353145

Jiang, J., Walters, D. M., Zhou, D., and Ediger, M. D.. Substrate temperature controls molecular orientation in two-component vapor-deposited glasses. United States: N. p., Web. doi:10.1039/c6sm00262e.
Jiang, J., Walters, D. M., Zhou, D., & Ediger, M. D.. Substrate temperature controls molecular orientation in two-component vapor-deposited glasses. United States. doi:10.1039/c6sm00262e.
Jiang, J., Walters, D. M., Zhou, D., and Ediger, M. D.. 2016. "Substrate temperature controls molecular orientation in two-component vapor-deposited glasses". United States. doi:10.1039/c6sm00262e. https://www.osti.gov/servlets/purl/1353145.
@article{osti_1353145,
title = {Substrate temperature controls molecular orientation in two-component vapor-deposited glasses},
author = {Jiang, J. and Walters, D. M. and Zhou, D. and Ediger, M. D.},
abstractNote = {Vapor-deposited glasses can be anisotropic and molecular orientation is important for organic electronics applications. In organic light emitting diodes (OLEDs), for example, the orientation of dye molecules in two-component emitting layers significantly influences emission efficiency. Here we investigate how substrate temperature during vapor deposition influences the orientation of dye molecules in a model two-component system. We determine the average orientation of a linear blue light emitter 1,4-di-[4-(N,N-diphenyl)amino]styrylbenzene (DSA-Ph) in mixtures with aluminum-tris(8-hydroxyquinoline) (Alq3) by spectroscopic ellipsometry and IR dichroism. We find that molecular orientation is controlled by the ratio of the substrate temperature during deposition and the glass transition temperature of the mixture. Furthermore, these findings extend recent results for single component vapor-deposited glasses and suggest that, during vapor deposition, surface mobility allows partial equilibration towards orientations preferred at the free surface of the equilibrium liquid.},
doi = {10.1039/c6sm00262e},
journal = {Soft Matter},
number = 13,
volume = 12,
place = {United States},
year = {2016},
month = {2}
}

Works referenced in this record:

Efficiency Enhancement of Organic Light-Emitting Diodes Incorporating a Highly Oriented Thermally Activated Delayed Fluorescence Emitter
journal, June 2014
  • Mayr, Christian; Lee, Sae Youn; Schmidt, Tobias D.
  • Advanced Functional Materials, Vol. 24, Issue 33, p. 5232-5239
  • DOI: 10.1002/adfm.201400495