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 404 for “"Triplet"”.
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Triplet-Triplet Annihilation Upconversion in Solid-State Organic-Inorganic Ureasil Polymer Hosts
Triplet–triplet-annihilation upconversion (TTA-UC) has attracted significant attention as an approach to harvest low energy solar photons that cannot be captured by conventional photovoltaic devices. However, device integration requires the design of solid-state TTA-UC materials that combine high …
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Development in utilizing singlet fission and triplet-triplet annihilation to improve solar cell efficiency
… warming. In this thesis, singlet fission and triplet-triplet annihilation would be discussed and studied to increase solar cell power conversion efficiency. Singlet fission splits a singlet exciton into two lower energy triplet excitons. This energy down conversion is efficient and have shown …
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Triplet-State Dynamics of Biacetyl
Made available in DSpace on 2014-12-10T23:01:47Z (GMT). No. of bitstreams: 1 7412126.pdf: 3797227 bytes, checksum: 16d9b347311bc44a4c69faae2134fc39 (MD5) Previous issue date: 1973
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Triplet exciton dynamics in conjugated polymer films
… for efficient use of these novel materials. Triplet excitons are believed to play an important role in conjugated polymer-based device operation. Triplet excitons are also believed to play a primary role in photo-oxidative degredation of polymer devices. Two-photon photoemission is used to …
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Triplet Exciton Management in Organic Electronic Devices
… can either be a spin-zero singlet or a spin-one triplet. In both organic light-emitting diodes and organic photovoltaics triplet excitons can be a source of loss due to poor radiative coupling to the ground state and energy loss on formation from the singlet state. In this thesis, methods of …
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Thiol-Ene Click Chemistry for Solid State Triplet-Triplet Annihilation Upconversion and Parts-Per-Billion Pyrophosphate Sensing in Artificial Seawater
… click photopolymerization. The advancement of triplet-triplet annihilation based upconversion (TTA-UC) in emerging technologies necessitates the development of solid-state systems that are readily accessible and broadly applicable. We demonstrate that thiol-ene click chemistry can be used as a …
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Quantum State Singlet-Triplet Character Control in 7Li2
… being a mixture of the pure singlet and pure triplet states. The initial mixing coefficients are governed by the strength of the spin-orbit coupling between the two levels. In lithium dimer, this mixing is very weak; the nominal singlet (triplet) state is initially 87% singlet (triplet) and …
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Spin-sensitive probes of triplet excitons in organic semiconductors
… investigates the spin interactions of spin-1 triplet excitons formed by singlet fission. Singlet fission produces two triplet excitons from one light-induced singlet state and holds promise to enable solar energy generation beyond traditional efficiency limits. As the lifetime of triplet pairs …
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Ultracold ²³Na⁶Li molecules in the triplet ground state
… experiments in spectroscopy and formation of triplet ²³Na⁶Li molecules from an initial mixture of ultracold ²³Na and ⁶Li. The production of quantum degenerate molecules with long-range dipolar interactions is a long-standing goal in low temperature physics. NaLi is a fermionic molecule with an …
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Triplet Exciton Management via Solid-State Interactions in Organic Semiconductors
… the effects of solid-state interactions on triplet excitons in a new family of organometallic light emitters, carbene-metal-amides (CMAs). Triplet excitons are normally silent in luminescence due to the spin-forbidden decay process, whereas effectively harvesting triplet excitons helps to …
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Controlling Triplet Excitons in Organic Semiconductors with Lanthanide-Doped Nanoparticles
… absorption, emission, and charge generation. Triplet excitons play a central role in determining the excited-state dynamics of OSCs under both optical and electrical excitation. However, in most closed-shell OSCs, triplet excitons are dark states that can neither be directly photogenerated nor …
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Triplet-Exciton Pairs in Organic Crystals: Optical Properties of TIPS-tetracene
Contains fulltext : 331368.pdf (Publisher’s version ) (Open Access)
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Behavior of Helium(triplet-2s) Metastables in Weakly Ionized Helium Plasmas
Made available in DSpace on 2014-12-10T19:06:43Z (GMT). No. of bitstreams: 1 7121183.pdf: 1989202 bytes, checksum: eec68465ebf9c895f07cb57264b8323b (MD5) Previous issue date: 1971
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Science and Engineering of Spin Triplet Excitons in Luminescent Molecular Semiconductors
… from OLEDs requires careful management of spin-triplet excitons, which are typically non-emissive. For successful management, the formation and harvesting dynamics of triplet excitons must be probed directly. In this thesis, we employ optical and spin-sensitive probes to reveal the dynamics of …
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Efficient Organic Light-emitting Diodes with Singlet, Triplet and Doublet Excitons
… determined by the spin state including singlets, triplets and doublets. Triplet excitons are regarded as dark states due to their spin-forbidden decay process, whereas effective triplet harvesting or triplet circumvention can help to improve the OLED performance. In this thesis, methods and …
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Spectroscopic investigations of intersystem crossing and triplet state structure in acetylene
… yielded a complete characterization of singlet-triplet interactions relevant to intersystem crossing in the region of the 3v3 vibrational level of the A 1A, excited electronic state of acetylene. Intersystem crossing proceeds through a "doorway" state which has been plausibly assigned as a …
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