Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"TADF"”.
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Naujų pirimidino - fenoksazino TADF spinduolių sintezė ir tyrimas /
Thermally activated delayed fluorescence (TADF) is an attractive way to achieve 100% internal fluorescence quantum yield without involving any expensive heavy atoms by converting all excitations to singlet ones by thermal activation. Usually, this is achieved by constructing TADF molecules with …
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Data-driven Materials Informatics for Optoelectronics: From Natural Language Processing to Predictive Modelling of TADF Molecules
… on thermally-activated delayed fluorescence (TADF). Chapter 1 provides an introduction to the background and recent progress in data-driven methods in materials sciences and thermally-activated delayed fluorescence. Chapter 2 reviews the natural language processing techniques and language …
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Science and Engineering of Spin Triplet Excitons in Luminescent Molecular Semiconductors
… of thermally activated delayed fluorescence (TADF) in the near infrared emitter CAT-1. We demonstrate TADF at a lower energy than had before been realised, verifying a simple molecular design concept that pushes the boundary of TADF. We then begin spin-sensitive studies of TADF using transient …
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Thermally Activated Delayed Fluorescence Emitters: Molecular Design, Photophysics, and Sensing Application
Thermally activated delayed fluorescence (TADF) is a strategy for harvesting both singlet and triplet excitons in some purely organic emitters and is attracting increasing interest beyond their use in organic light-emitting diodes (OLEDs), including chemical sensing. In this thesis, coumarin-based …
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Optimization of molecular emitters for new generation OLEDs /
… internal quantum efficiency. Efficiency of those TADF OLEDs is the same as of phosphorescent ones, however with much higher lifetime. Despite this, the molecular structure of TADF emitters is quite complex and even small changes of molecular architecture leads to remarkable changes of optical …
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Molekulinių spinduolių optimizacija naujos kartos organiniams šviestukams /
… internal quantum efficiency. Efficiency of those TADF OLEDs is the same as of phosphorescent ones, however with much higher lifetime. Despite this, the molecular structure of TADF emitters is quite complex and even small changes of molecular architecture leads to remarkable changes of optical …
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I. Kinetic Modeling of Surface Reactions II. Computational Design of Organic Semiconductors
… in thermally activated delayed fluorescence (TADF) and triplet-triplet annihilation (TTA), which convert the nonemissive triplet excitons into emissive singlet excitons. First, we introduce a simple four-state model of TADF. The model predicts that it is possible to realize adiabatic singlet …
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Electronic processes in organic optoelectronics : insights gained through modeling and magnetic field effects
… OPVs. Thermally activated delayed fluorescence (TADF) is becoming an increasingly important OLED technology that extracts light from non-emissive triplet states via reverse intersystem crossing (RISC) to the bright singlet state. We use MFEs to prove a rather surprising finding that in TADF …
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Spectroscopic Studies of Excited States in Carbene-Metal-Amide Emitters
… thermally activated delayed fluorescence (TADF). In contrast to usual TADF emitters, CMAs incorporate a metal centre which enhances spin-orbit coupling effects. However, the in-depth emission mechanism in CMAs has been subject to some uncertainty, and high-performing blue CMAs have remained …
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Efficient Organic Light-emitting Diodes with Singlet, Triplet and Doublet Excitons
… thermally activated delayed fluorescent (TADF) hosts which can induce efficient singlet-to-doublet energy transfer to TTM-3NCz. These mechanisms can be successfully translated to devices with maintained OLED performance and enhanced device lifetimes. Finnaly, we present the tuneability of …
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Systematic improvement and applications of density functional theory in complex chemical systems
… of new thermally activated delayed fluorescence (TADF) materials using conventional time-dependent DFT method, while point out the need for better excited-state DFT methods. Finally, we develop efficient computational screening protocols to study TADF materials based on a restricted open-shell …
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Evolution of Turbine Blade Deposits in an Accelerated Deposition Facility: Roughness and Thermal Analysis
… the BYU Turbine Accelerated Deposition Facility (TADF), which was used to simulate three months of deposition within a two hour test time. All three coupons underwent four cycles in the TADF: eight total hours of combustor testing—or one simulated year of deposition—with topological measurements …
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Neue Triazol- und Triazin-basierte Matrixmaterialien für blaue organische Leuchtdioden
… thermisch aktivierten, verzögerten Fluoreszenz (TADF) untersucht. Hierbei können bei geeigneten Design der Moleküle durch thermische Anregung die Triplettzustände über Reversed Intersystem Crossing in die Singulettzustände angehoben werden, wodurch die Emission mittels Fluoreszenz erfolgen kann. …
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Exciton dynamics in organic semiconductors for efficient electroluminescent devices
… that thermally activated delayed fluorescence (TADF) materials are exploited as an exciton sensitiser to a fluorescent emitter, is investigated. Firstly, the possibility of excluding the host matrix is investigated based on the exploration of exciton energy transfer between donors and acceptors. …
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Photophysics of small molecule organo-metallic complexes for OLED applications
… Thermally Activated Delayed Fluorescence (TADF). The incorporation of both sets of physical processes which have previously allowed emission from triplet states has resulted in a class of materials with near 100% photoluminescence and internal device efficiencies, and I show the nature of …
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Enhancing Fluorescence and Charge Transport in Disordered Organic Semiconductors
… thermally activated delayed fluorescence (TADF). In the low-aggregation limit where $\Phi$ is maximised, we show that non-radiative triplet recombination is strongly related to low frequency torsional motion, and both are reduced in the presence of a rigid polymer host matrix for various …
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Palladium-catalyzed C-N cross-coupling and application to the synthesis of delayed singlet emitters for OLED development
… novel thermally activated delayed fluorescence (TADF) materials for use in organic light emitting devices (OLEDs) is reported. A series of triptycenebased delayed singlet emitters have been synthesized using a palladium-catalyzed C-N, C-C, C-N cross-coupling sequence. Preliminary investigations …
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Estudio de diferentes estrategias para la síntesis de compuestos de oro(I) con propiedades luminiscentes de alta eficiencia
… called Thermally Activated Delayed Fluorescence (TADF). Finally, in order to explore how the presence of other metal centres affects more rigid matrices such as gold(I) metallopolymers based on the organic polymer poly(4-vinylpyridine), silver(I) metal centres have been incorporated into these …
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Triplet Exciton Management in Organic Electronic Devices
To date optoelectronic devices have been dominated by inorganic semiconductors such as silicon and gallium nitride. However organic semiconductors have many potential advantages and have shown significant research progress in both organic light-emitting diodes and organic photovoltaics. …
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QUANTUM OBSERVABLES OF OPEN-SHELL SYSTEMS. A THEORETICAL STUDY
This PhD thesis reports original research results concerning the development of theoretical models and computational protocols for the quantification and analysis of two of the most important quantum observables of open-shell systems: the electron spin density and the phosphorescence energy gap. In …