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Vapor-to-glass preparation of biaxially aligned organic semiconductors.

Authors :
Ju, Jianzhu
Chatterjee, Debaditya
Voyles, Paul M.
Bock, Harald
Ediger, Mark D.
Source :
Journal of Chemical Physics; 12/7/2023, Vol. 159 Issue 21, p1-7, 7p
Publication Year :
2023

Abstract

Physical vapor deposition (PVD) provides a route to prepare highly stable and anisotropic organic glasses that are utilized in multi-layer structures such as organic light-emitting devices. While previous work has demonstrated that anisotropic glasses with uniaxial symmetry can be prepared by PVD, here, we prepare biaxially aligned glasses in which molecular orientation has a preferred in-plane direction. With the collective effect of the surface equilibration mechanism and template growth on an aligned substrate, macroscopic biaxial alignment is achieved in depositions as much as 180 K below the clearing point T<subscript>LC−iso</subscript> (and 50 K below the glass transition temperature T<subscript>g</subscript>) with single-component disk-like (phenanthroperylene ester) and rod-like (itraconazole) mesogens. The preparation of biaxially aligned organic semiconductors adds a new dimension of structural control for vapor-deposited glasses and may enable polarized emission and in-plane control of charge mobility. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219606
Volume :
159
Issue :
21
Database :
Complementary Index
Journal :
Journal of Chemical Physics
Publication Type :
Academic Journal
Accession number :
174100411
Full Text :
https://doi.org/10.1063/5.0174819