Growth of high-quality naphthalene single crystals using selective self-seeding vertical Bridgman technique (SSVBT) and its characterization

Selvakumar, S.; Sivaji, K.; Arulchakkaravarthi, A.; Balamurugan, N. B.; Sankar, S.; Ramasamy, P.

doi:10.1016/j.jcrysgro.2005.05.022

Cited by 30 publications

(14 citation statements)

References 21 publications

(33 reference statements)

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“…Large high quality naphthalene single crystals doped with pentacene were grown with a self-seeding vertical Bridgeman technique [27]. Pentacene deteriorates under light irradiation when exposed to oxygen.…”

Section: Spin Filter Crystalmentioning

confidence: 99%

Spin filtering neutrons with a proton target dynamically polarized using photo-excited triplet states

Haag

Brandt

Eichhorn

et al. 2012

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tIn a test of principle a neutron spin filter has been built, which is based on dynamic nuclear polarization (DNP) using photo-excited triplet states. This DNP method has advantages over classical concepts as the requirements for cryogenic equipment and magnets are much relaxed: the spin filter is operated in a field of 0.3 T at a temperature of about 100 K and has performed reliably over periods of several weeks.The neutron beam was also used to analyze the polarization of the target employed as a spin filter. We obtained an independent measurement of the proton spin polarization of $ 0:13 in good agreement with the value determined with NMR. Moreover, the neutron beam was used to measure the proton spin polarization as a function of position in the naphthalene sample. The polarization was found to be homogeneous, even at low laser power, in contradiction to existing models describing the photoexcitation process.

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Section: Spin Filter Crystalmentioning

confidence: 99%

Spin filtering neutrons with a proton target dynamically polarized using photo-excited triplet states

Haag

Brandt

Eichhorn

et al. 2012

Nuclear Instruments and Methods in Physics Research Section A:

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“…Furthermore, the anisotropic nature of the crystal phases of these aromatic compounds can be used to look for directional modulation of the DM flux, further improving sensitivity to the DM-electron cross section and background rejection capabilities. In the solid state, large single crystals of polyacenes can be synthesized readily for pure compounds and binary/mixed scintillators [54][55][56]. These binary solid state targets maintain very high light yields while the crystal structure is known to produce anisotropic scintillation responses [57][58][59].…”

Section: Future Prospects With Organic Scintillatorsmentioning

confidence: 99%

Dark matter-electron scattering from aromatic organic targets

et al. 2020

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Sub-GeV dark matter (DM) which interacts with electrons can excite electrons occupying molecular orbitals in a scattering event. In particular, aromatic compounds such as benzene or xylene have an electronic excitation energy of a few eV, making them sensitive to DM as light as a few MeV. These compounds are often used as solvents in organic scintillators, where the de-excitation process leads to a photon which propagates until it is absorbed and re-emitted by a dilute fluor. The fluor photoemission is not absorbed by the bulk, but is instead detected by a photon detector such as a photomultiplier tube. We develop the formalism for DM-electron scattering in aromatic organic molecules, calculate the expected rate in p-xylene, and apply this calculation to an existing measurement of the single photo-electron emission rate in a low-background EJ-301 scintillator cell. Despite the fact that this measurement was performed in a shallow underground laboratory under minimal overburden, the DM-electron scattering limits extracted from these data are already approaching leading constraints in the 3-100 MeV DM mass range. We discuss possible next steps in the evolution of this direct detection technique, in which scalable organic scintillators are used in solid or liquid crystal phases and in conjunction with semiconductor photodetectors to improve sensitivity through directional signal information and potentially lower dark rates.

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“…However, they are unsuitable for growing crystals from molecules that exhibit poor solubility and low vapor pressures, respectively. Crystal growth from the melt is appropriate for organic semiconductors that melt at low temperatures without decomposition . Unfortunately, organic semiconductor molecules are often chemically unstable near their melting temperatures and decompose before melting.…”

Section: Heterogeneous Integration Of Organic Single Crystalsmentioning

confidence: 99%

“…Unfortunately, organic semiconductor molecules are often chemically unstable near their melting temperatures and decompose before melting. As a result, the melt growth approach has been used for only a few small organic molecules such as naphthalene, tetracene, and stilbene . Recently, a melt growth approach employing eutectic mixtures (instead of pure materials) was proposed to enable the desired organic semiconductor molecules to melt at temperatures that are much lower than their original melting points .…”

Section: Heterogeneous Integration Of Organic Single Crystalsmentioning

confidence: 99%

Heterogeneous Monolithic Integration of Single‐Crystal Organic Materials

et al. 2016

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Manufacturing high-performance organic electronic circuits requires the effective heterogeneous integration of different nanoscale organic materials with uniform morphology and high crystallinity in a desired arrangement. In particular, the development of high-performance organic electronic and optoelectronic devices relies on high-quality single crystals that show optimal intrinsic charge-transport properties and electrical performance. Moreover, the heterogeneous integration of organic materials on a single substrate in a monolithic way is highly demanded for the production of fundamental organic electronic components as well as complex integrated circuits. Many of the various methods that have been designed to pattern multiple heterogeneous organic materials on a substrate and the heterogeneous integration of organic single crystals with their crystal growth are described here. Critical issues that have been encountered in the development of high-performance organic integrated electronics are also addressed.

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Growth of high-quality naphthalene single crystals using selective self-seeding vertical Bridgman technique (SSVBT) and its characterization

Cited by 30 publications

References 21 publications

Spin filtering neutrons with a proton target dynamically polarized using photo-excited triplet states

Spin filtering neutrons with a proton target dynamically polarized using photo-excited triplet states

Dark matter-electron scattering from aromatic organic targets

Heterogeneous Monolithic Integration of Single‐Crystal Organic Materials

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