A5012719552- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Perovskite Materials and Applications
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Luminescence and Fluorescent Materials
- Fullerene Chemistry and Applications
- Advanced Memory and Neural Computing
- Synthesis and Properties of Aromatic Compounds
- Analytical Chemistry and Sensors
- Organic and Molecular Conductors Research
- Semiconductor Quantum Structures and Devices
- Organic Light-Emitting Diodes Research
- Quantum and electron transport phenomena
- Machine Learning in Materials Science
- Nonlinear Optical Materials Research
- Strong Light-Matter Interactions
- Neuroscience and Neural Engineering
- Quantum Dots Synthesis And Properties
- Phase-change materials and chalcogenides
- Thermal Radiation and Cooling Technologies
- Nonlinear Optical Materials Studies
- Family Support in Illness
- Academic Freedom and Politics
- ZnO doping and properties
University of Kentucky
2019-2024
Queen Alexandra Hospital
2005
Blends comprising organic semiconductors and inorganic quantum dots (QDs) are relevant for many optoelectronic applications devices. However, the individual components in organic-QD blends have a strong tendency to aggregate phase-separate during film processing, compromising both their structural electronic properties. Here, we demonstrate QD surface engineering approach using electronically active, highly soluble semiconductor ligands that matched host material achieve well-dispersed...
Radiation therapy is one of the most prevalent procedures for cancer treatment, but risks malignancies induced by peripheral beam in healthy tissues surrounding target high. Therefore, being able to accurately measure exposure dose a critical aspect patient care. Here radiation detector based on an organic field-effect transistor (RAD-OFET) introduced, vivo dosimeter that can be placed directly patient's skin validate real time delivered and ensure nearby regions acceptable level low...
Abstract Optoelectronic properties of anisotropic crystals vary with direction requiring that the orientation molecular organic semiconductor is controlled in optoelectronic device active layers to achieve optimal performance. Here, a generalizable strategy introduce periodic variations out‐of‐plane orientations 5,11‐bis(triisopropylsilylethynyl)anthradithiophene (TIPS ADT) presented. TIPS ADT crystallized from melt presence 16 wt.% polyethylene (PE) forms banded spherulites crystalline...
Hybrid organic–inorganic metal-halide perovskites have emerged as versatile materials for enabling low-cost, mechanically flexible optoelectronic applications. The progress has been commendable; however, technological breakthroughs outgrown the basic understanding of processes occurring in bulk and at device interfaces. Here, we investigated photocurrent perovskite/organic semiconductor interfaces relation to microstructure electronically active layers. We found that response is...
We explore the photodegradation mechanisms in functionalized tetracene (TIPS-Tc) films and how they are influenced by strong exciton–photon coupling planar microcavities. demonstrate that degradation of TIPS-Tc exposed to air proceeds mainly through an oxygen-mediated pathway, assigned endoperoxide (EPO) formation, whereas microcavities oxygen-independent photodimerization. The aerobic anaerobic decay were found differ rate more than two orders magnitude. Both EPO formation photodimerization...
Access to the dynamics of trap annihilation/generation resulting from isomer rearrangement identifies performance-limiting processes in organic thin-film transistors.
A previously unreported polymorph of 5,11-bis(triisopropylsilylethynyl)anthradithiophene (TIPS ADT), Form II, crystallizes from melt-processed TIPS ADT films blended with 16 ± 1 wt % medium density polyethylene (PE). ADT/PE blends that initially are crystallized the melt produce twisted crystals a metastable (Form IV, space group P1̅) brickwork packing motif distinct slipstack by solution-processed I, P21/c) at room temperature. When these were cooled to temperature and subsequently annealed...
Abstract Approaches to control the self‐assembly of aromatic structures enhance intermolecular electronic coupling are key development new and photonic materials. Acenes in particular have proven simple functionalize induce strong π ‐stacking interactions, although finer ‐overlap has more difficult accomplish. In this report, we describe how very weak hydrogen bonding interactions can exert profound impact on solid‐state order solubilized pentacenes, inducing either head‐to‐tail motifs with...
Abstract Dehydroannulenes are alkyne‐rich macrocycles possessing rigid, planar, π‐conjugated backbones. Octadehydro[12]annulenes in particular formally antiaromatic, and have been shown to possess stable reduced states with exploitable LUMO energies. However, very few examples of this type annulene structurally characterized, there is little information on the stability these antiaromatic molecules solution or solid state. We synthesized a range substituted octadehydro[12]annulenes,...
Ligand Directed Self-Assembly of Bulk Organic-Semiconductor/Quantum-Dot Blend Films: Towards Efficient Triplet Exciton-Photon Interconversion in the Solid StateVictor Gray a, b, Daniel Toolan c, d, Simon Dowland e, Jesse Allardice Michael Weir f, Zhilong Zhang James Xiao Anastasiia Klimash h, Jurjen Winkel Emma Holland g, Garrett Fregoso John Anthony Hugo Bronstein Richard Friend Ryan Jones i, Neil Greenham Akshay Rao ba Department Chemistry—Ångström Laboratory, Uppsala University, SE 751 21...
Alchemi is a product of Emma Holland’s senior thesis for her BFA in graphic design. In this booklet, she discusses the branding, advertising, photography, and underlying principles design Alchemi: personalized aeroponic agriculture business. purpose behind business was to transform urban farming. Her project contains extensive research into produce farming, entrepreneurship, art history. 
 Additionally, website that created can be found here.
Dark-state triplet excitons lead to energy loss in organic light emitting diodes and photovoltaics; recently there has been considerable effort convert this improve device efficiency. While some observed improvement tied control of the state, alternate explanations cannot be ruled out as influence architecture can mask underlying physics. In order investigate contribution output, we study single crystal 2,8-difluoro-5,11-bis(triethylsilylethynyl)anthradithiophene (diF TES ADT) using...
Controlling the amount of radiation that a cancer patient receives during treatment is critical to ensure intended outcome. In this work we use small molecule organic semiconductor devices as sensors/dosimeters which have an effective Z close human tissue. Solution processing provides excellent opportunities for scalability on flexible substrates, allowing them conform skin and clothing, enabling dose measurement at point entry body. Previous using field-effect transistors (OFETs) detection...