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

Jiang, J.; Walters, D. M.; Zhou, D.; Ediger, M. D.

doi:10.1039/c6sm00262e

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

Journal Article · Mon Feb 22 00:00:00 EST 2016 · Soft Matter

DOI:https://doi.org/10.1039/c6sm00262e· OSTI ID:1353145

Jiang, J. ^[1]; Walters, D. M. ^[2]; Zhou, D. ^[1]; Ediger, M. D. ^[2]

Nanjing Univ., Nanjing (China)
Univ. of Wisconsin, Madison, WI (United States)

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.

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Research Organization:: Univ. of Wisconsin System, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0002161

OSTI ID:: 1353145

Journal Information:: Soft Matter, Vol. 12, Issue 13; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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