Luminescence of complex organic molecules upon electron excitation

Кухто, А. В.

doi:10.1007/bf02679844

Cited by 13 publications

(14 citation statements)

References 23 publications

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“…At such high field the excited states can be formed by direct electron impact ionization. In addition, the electron excitation is less selective than optical excitation [10]. Electron beam excitation can in principle activate all possible luminescence mechanisms present in organic materials and can have orders-of magnitude greater carrier generation rates than optical excitation.…”

Section: Resultsmentioning

confidence: 99%

“…Mostly, electron microscopists have used cathodoluminescence of organic matter for imaging polymer and organic molecular thin films [9]. There were experimental attempts in former Soviet Union to obtain electron beam-pumped lasing from complex organic molecules in the condensed phase [10]. Interesting study of local EL and CL spectra from thin film of the conjugated polymer (soluble PPV derivative), generated by electron beam from the STM tip, has been reported [11].…”

Section: Introductionmentioning

confidence: 99%

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Cathodoluminescence and electroluminescence from multi-layered organic structures induced by field electron emission from carbon nanotubes

Kuznetzov

Zakhidov

Ovalle

et al. 2005

Organic Light-Emitting Materials and Devices IX

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We report the observation of cathodoluminescence (CL) of organic multilayers of tris-(8-hydroxyquinoline) aluminium (Alq3) and 2-(4biphenyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD) deposited on ITO-coated glass, with and without hole transport layer and compare it with electroluminescence (EL) from similar devices. Excitation of the CL of such multilayer organic anodes was accomplished by low energy electrons field emitted by single walled carbon nanotube cathodes. The dependence of CL spectrum and intensity on voltage (V), current (I), type of transport layer and the cathode-anode geometry has been studied. We propose carbon nanotubes as a cathode for stable CL emission from multi-layer anodes at small cathode-anode separations. The role of hole-transport layer is also discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cathodoluminescence and electroluminescence from multi-layered organic structures induced by field electron emission from carbon nanotubes

Kuznetzov

Zakhidov

Ovalle

et al. 2005

Organic Light-Emitting Materials and Devices IX

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“…3). The study of interaction with electron beam is very important, because luminophor molecules in electroluminescent cell are excited by electrons [5,6]. Porous alumina is known [7] to luminesce in a wide spectral region with a maximum at 430 nm.…”

Section: Resultsmentioning

confidence: 99%

P‐31: New Organic Electroluminescence Structures Using Porous Alumina Films

Кухто¹,

Kolesnik²,

Shakah³

et al. 2000

Symp Digest of Tech Papers

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“…The cross section is smooth with breaks near energies that may correspond to appearance potentials of fragment ions. The first ionization potential E i = 8.74 eV was calculated using algorithm (3). This value agrees well with the literature [4] in which the first ionization potential was determined from electron-energy loss spectra and optical absorption.…”

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confidence: 98%

“…Therefore, the study of fragmentation pathways of molecules upon impact with electrons of various energies is crucial. The molecule 1,4-di(2,5-phenyloxazolyl)benzene (POPOP) is one of the most studied with respect to optical excitation and excitation by electron impact [3][4][5][6]. We began research in this area namely with this molecule.…”

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confidence: 99%

Fragmentation of the POPOP molecule by electron-impact ionization

et al. 2008

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Single and dissociative ionizations of the POPOP molecule by electron impact in the gas phase are studied using mass spectroscopy. Fragmentation pathways of the molecule are proposed taking into account the common system of conjugated π-electrons and heteroatoms in the POPOP molecule. The appearance thresholds for certain fragments of the molecule are determined based on experimentally measured ionization cross sections as functions of the ionizing electron energy. An ion with m/z = 144 [C 9 H 6 ON] + that is complementary to a fragment with m/z = 220 [C 13 H 10 ON] + (present in the NIST mass spectrum database) is found for the first time in the mass spectrum of POPOP. Its appearance threshold is determined (E ap = 9.48 eV). Introduction. Complicated organic compounds are widely used in modern high technologies, in particular, in various molecular electronics devices [1]. Molecules interact with electrons of various energies in such devices [2].One of the most important properties is the stability of the molecules upon interaction with electrons, which is determined mainly by the molecular structure and the electron energy. Therefore, the study of fragmentation pathways of molecules upon impact with electrons of various energies is crucial. The molecule 1,4-di(2,5-phenyloxazolyl)benzene (POPOP) is one of the most studied with respect to optical excitation and excitation by electron impact [3][4][5][6]. We began research in this area namely with this molecule. POPOP is widely used as an active component of laser media and liquid and plastic scintillators and in luminescent solar-energy concentrators [7]. Linear derivatives of oxazole and oxadiazole are commonly used as electron-transport and emitting layers of thin-film electroluminescent devices [8][9][10][11][12]. Fragmentation of the molecule upon interaction with electrons forms radical ions that quench luminescence and induces ion-molecule reactions that eventually cause these devices to degrade.Herein we study single and dissociative ionization of POPOP by electron impact in the gas phase using mass spectrometry, one of the most direct methods for determining fragmentation pathways of molecules.Experimental. The experiment was performed in a system with an oil-free pump. The analytical instrument was an MKh-7304A monopole mass spectrometer, a dynamic instrument that is essentially a mass band filter. Ions passing through the mass filter are detected and recorded by the measurement system containing a digital indicator of mass number and intensity, manual operation, cyclic, programmed scanning of mass spectra and bombarding electron energy. The experiment has been described in detail [13]. Therefore, we will concentrate on the principal methodical aspects of solving the problem.A beam of POPOP molecules was created by a multi-channel effusion source that provided a concentration of molecules in the region of interaction with the electron beam of 10 10 -10 11 cm -3 . The ion source with electron bombardment operated with electron-current stabilization and cou...

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Luminescence of complex organic molecules upon electron excitation

Cited by 13 publications

References 23 publications

Cathodoluminescence and electroluminescence from multi-layered organic structures induced by field electron emission from carbon nanotubes

Cathodoluminescence and electroluminescence from multi-layered organic structures induced by field electron emission from carbon nanotubes

P‐31: New Organic Electroluminescence Structures Using Porous Alumina Films

Fragmentation of the POPOP molecule by electron-impact ionization

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