Ediger Research Group
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Generic behavior of ultrastability and anisotropic molecular packing in co-deposited organic semiconductor glass mixtures
(Chemistry of Materials, 2024-03-29)Vapor-deposited glass mixtures of organic semiconductors commonly serve as active layers in organic electronic devices, whose lifetime and performance are strongly influenced by the stability and structure of these mixed ... -
High Density Two-Component Glasses of Organic Semiconductors Prepared by Physical Vapor Deposition
(Journal of Physical Chemistry Letters, ACS publication, 2024-08-01)Physical vapor deposition (PVD) is widely utilized for the production of organic semiconductor devices due to its ability to form thin layers with exceptional properties. Although the layers in the device usually consist ... -
Surface Equilibration Mechanism Controls the Stability of a Model Codeposited Glass Mixture of Organic Semiconductors
(2023-05-02)While previous work has identified the conditions for preparing ultrastable singlecomponent organic glasses by physical vapor deposition (PVD), little is known about the stability of codeposited mixtures. Here, we prepared ... -
Characterization of the Interfacial Orientation and Molecular Conformation in a Glass-Forming Organic Semiconductor
(ACS Applied Materials & Interfaces, 2022-01-04)The ability to control structure in molecular glasses has enabled them to play a key role in modern technology; in particular, they are ubiquitous in organic light-emitting diodes. While the interplay between bulk structure ... -
Surface equilibration mechanism controls the molecular packing of glassy molecular semiconductors at organic interfaces
(United States National Academy of Sciences, 2021)Glasses prepared by physical vapor deposition (PVD) are anisotropic, and the average molecular orientation can be varied significantly by controlling the deposition conditions. While previous work has characterized the ... -
Stable Glasses of Organic Semiconductor Resist Crystallization
(American Chemical Society, 2020)The instability of glassy solids poses a key limitation to their use in several technological applications. Well-packed organic glasses, prepared by physical vapor deposition (PVD), have drawn attention recently because ... -
Dense Glass Packing Can Slow Reactions with an Atmospheric Gas
(J. Phys. Chem. B, 2019-11-06)Previous work utilizing crystal polymorphs has established the importance of the molecular packing environment for modulating solid-gas reactivity. Here we show, for the first time, that the chemical stability of an amorphous ... -
Over What Length Scale Does an Inorganic Substrate Perturb the Structure of a Glassy Organic Semiconductor?
(American Chemical Society, 2020-05-13)While the bulk structure of vapor-deposited glasses has been extensively studied, structure at buried interfaces has received little attention, despite being important for organic electronic applications. To learn about ... -
Generic packing motifs in vapor-deposited glasses of organic semiconductors
(Royal society of chemistry, 2019-08-23)We study the structure of vapor-deposited glasses of five common organic semiconductors as a function of substrate temperature during deposition, using synchrotron X-ray scattering. For deposition at a substrate temperature ... -
Glass Structure Controls Crystal Polymorph Selection in Vapor-Deposited Films of 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl
(American Chemical Society, 2018-08-28)Glasses of a common OLED host material, 4,4′-bis(N-carbazolyl)-1,1′-biphenyl or CBP, were prepared by vapor deposition at various substrate temperatures. Consistent with previous work, the substrate temperature during ... -
Origin of Anisotropic Molecular Packing in Vapor-Deposited Alq3 Glasses
(American Chemical Society, 2018-12-24)Anisotropic molecular packing is a key feature that makes glasses prepared by physical vapor deposition (PVD) unique materials, warranting a mechanistic understanding of how a PVD glass attains its structure. To this end, ... -
Influence of Molecular Shape on the Thermal Stability and Molecular Orientation of Vapor-Deposited Organic Semiconductors
(2018-09-14)High thermal stability and anisotropic molecular orientation enhances the performance of vapor-deposited organic semiconductors, but controlling these properties is a challenge in amorphous materials. To understand the ... -
Tenfold increase in the photostability of an azobenzene guest in vapor-deposited glass mixtures
(2018-09-10)Improvements to the photostability of organic glasses for use in electronic applications have generally relied on modification of chemical structure. We show here that the photostability of a guest molecule can also be ... -
Vapor-deposited Organic Glasses Exhibit Enhanced Stability Against Photodegradation
(Soft Matter, 2018-03-25)Photochemically stable solids are in demand for applications in organic electronics. Previous work has established the importance of the molecular packing environment by demonstrating that different crystal polymorphs ... -
Vapor-Deposited Glasses with Long-Range Columnar Liquid Crystalline Order
(American Chemical Society, 2017-10-04)Anisotropic molecular packing, particularly in highly ordered liquid crystalline arrangements, has the potential for optimizing performance in organic electronic and optoelectronic applications. Here we show that physical ... -
Influence of Molecular Shape on the Thermal Stability and Molecular Orientation of Vapor-Deposited Organic Semiconductors
(American Chemical Society, 2017-07-05)High thermal stability and anisotropic molecular orientation enhance the performance of vapor-deposited organic semiconductors, but controlling these properties is a challenge in amorphous materials. To understand the ... -
Nematic-like stable glasses without equilibrium liquid crystal phases
(American Institute of Physics, 2017)We report the thermal and structural properties of glasses of posaconazole, a rod-like molecule, prepared using physical vapor deposition (PVD). PVD glasses of posaconazole can show substantial molecular orientation ... -
Influence of Hydrogen Bonding on the Kinetic Stability of Vapor Deposited Glasses of Triazine Derivatives
(American Chemical Society, 2017)It has recently been established that physical vapor deposition (PVD) can produce organic glasses with enhanced kinetic stability, high density, and anisotropic packing, with the substrate temperature during ... -
Photostability can be significantly modulated by molecular packing in glasses
(Journal of the American Chemical Society, 2016-08-12)While previous work has demonstrated that molecular packing in organic crystals can strongly influence photochemical stability, efforts to tune photostability in amorphous materials have shown much smaller effects. Here ... -
Material for "Substrate temperature controls molecular orientation in two-component vapor- deposited glasses." Soft Matter, 2016, 12, 3265.
(Soft Matter, 2016)Data set for work presented in Jiang, J.; Walters, D. M.; Zhou, D.; Ediger, M. D. “Substrate Temperature Controls Molecular Orientation in Two -Component Vapor-deposited Glasses.” Soft Matt. 2016, 12, 3265.