Organic thin film materials producing novel blue laser

El-Nadi, L.M.; Al-Houty, L.; Omar, Mahmoud; Ragab, Marwa A.A.

doi:10.1016/s0009-2614(98)00066-9

Cited by 10 publications

(10 citation statements)

References 15 publications

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“…A year later an edge blue-emitting diode was claimed to form an electrically-pumped thin organic film laser [313]. Figure 81 shows a schematic diagram of the diode consisting of glass/Al/NB/(Alq 3 + NB)(1:1 mixture)/In configuration.…”

Section: Edge-emitting Ledsmentioning

confidence: 99%

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Electroluminescence in organics

Kalinowski

1999

J. Phys. D: Appl. Phys.

231

161

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There is growing interest in organic electroluminescence (EL). A great deal of progress has been made recently in improving the performance of various classes of organic EL devices. Some of these are now adequate for many applications. However, specialists focusing on selected aspects of organic EL devices have often lost contact with the general subject of EL. Therefore, a review covering all aspects of EL mechanisms and their experimental manifestation seemed necessary. This article is concerned with the new EL device physics that can be realized using crystals, or films made of organic materials, as electrically and optically active components, in devices ranging from simple single-component light emitting diodes (LEDs), through double-and multi-layer LEDs to light emitting electrochemical cells (LECs) and organic LED-based light transducers. The investigation of the properties of these devices has provided in turn a very effective method for studying the basic EL phenomena in these materials. Since the subject of the present review has generated a huge amount of literature, and it is impossible to mention here all that has been done, we have attempted to provide an outline of the background of the field of organic EL, and discussed in some detail those aspects most relevant to the EL device physics. Because of the diversity of the types of material and EL structure, there is no single, simple description of EL in organics. Therefore, the initial sections of the article are devoted to a discussion of the types of EL and related phenomena, such as carrier injection and recombination or nature of emitting states. Then, the fundamentals of the fabrication of various types of EL devices are discussed along with the most representative examples. In general, the reader will find in the article a brief historical review of the subject as well as a description of the latest trends in organic EL research covering all the new concepts and most important data which have become available before the time of publication.

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Section: Edge-emitting Ledsmentioning

confidence: 99%

“…The green emission of the Alq 3 LED emitter appears as the output light only at the spot corresponding to that irradiated by the He-Ne laser ; and (c) the energy-level diagram for the device. After El-Nadi et al [313]. Copyright Elsevier Science, with permission.…”

Section: Organic Led-based Light Transducersmentioning

confidence: 99%

Electroluminescence in organics

Kalinowski

1999

J. Phys. D: Appl. Phys.

231

161

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“…For sample No. 1, on heating the luminescence intensity of PF decreased more rapidly than for Ir(ppy) 3 . After the annealing process (heating and cooling), the luminescence intensity of the PF matrix did not reach the initial value, while the luminescence intensity of Ir(ppy) 3 proved to be significantly higher than the initial value.…”

Section: Introductionmentioning

confidence: 90%

“…[1]. Data are available on achieving amplification [2] and designing electrically pumped thin-film lasers [3,4]. Thin-film lasers and radiation converters based on organic electroactive materials have also been widely studied [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Emission properties of thin films of electroactive doped polymers

et al. 2007

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We have studied the effect of the intensity of the exciting radiation and the temperature on the emission properties of two kinds of thin-film samples based on blends of two types of organic electroactive materials: polyfluorene + iridium triphenylpyridinate and polyepoxypropylcarbazole + zero-th order PAMAM dendrimer with eosin. We have shown that an increase in the excitation intensity leads to an increase in the intensity of the luminescence of the polymer matrices and the iridium complex up to a power density of 300 kW/cm 2 , and the emission of the dendrimer is rapidly saturated and does not return to the initial value when the excitation level decreases. Heating up to 170 o C followed by cooling causes an increase in the intensity for all the components except the dendrimer. The data obtained show that annealing is an important method for improving the emission efficiency of the proposed thin-film structures, due to a change in the packing of the activator molecules in the polymer matrix leading to more efficient transfer of the excitation energy. Molecules of the studied dendrimer are not stable when exposed to optical radiation and temperature.Introduction. Organic electroactive materials, owing to their optical and electrophysical properties, have become widely used in designing electroluminescent diodes, displays, sensors, solar cells, etc.[1]. Data are available on achieving amplification [2] and designing electrically pumped thin-film lasers [3,4]. Thin-film lasers and radiation converters based on organic electroactive materials have also been widely studied [5][6][7]. The most attractive for these purposes from both a functional and a technological point of view are blends of electroactive polymers and electroactive low molecular weight organic materials which are activators. In such blends, the polymer matrix serves as a solid "solvent" for the activator. Under appropriate conditions, energy and charge transfer processes can occur in these systems, improving the transport and emission properties. During operation of such devices, as a result of electric current flow the organic materials used heat up, which causes a change in their optical and electrophysical properties [8][9][10] and also their morphology. Widespread use of organic light emitters that are promising for application in devices for display of video information (televisions, computer displays, mobile phones, digital cameras, etc.) and also in photovoltaic and sensor devices has been significantly held back by insufficient photostability and temperature stability. These parameters cannot be improved without obtaining additional information about the processes and effects responsible for the temperature and degradation stability of organic semiconductors. Such information will make it easier to achieve operating characteristics for organic semiconductor emitters sufficient for their application in commercial devices for displaying information. For their reliable operation, we need to choose not only activators with appropriate propertie...

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“…[6][7][8][9] Assembling of nanostructured LB films with the help of electrostatic interactions has advantages over a time-consuming and expensive chemical synthesis. 16,17 Dye NR is widely used as an active material for light-emitting diodes and lasers, 18,19 in solar energy concentrators, 20 sensor of the medium polarity. [10][11][12] Nanostructured materials obtained by using different principles of self-organization and molecular recognition serve as a basis for the development of tunable nano-porous materials with anisotropic properties, such as proton conductivity.…”

Section: Introductionmentioning

confidence: 99%

Fluorescencing behavior of thin solid films based on polyelectrolyte‐surfactant complex and dye molecules

Seliverstova

Ibrayev

Kudaibergenov

2012

J of Applied Polymer Sci

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This article is devoted to investigation of interaction between polycomplex and dye molecules assembled in fluorescent thin solid Langmuir-Blodgett (LB) films. Preparation procedure of organosoluble stoichiometric polycomplex based on cationic polyelectrolyte and anionic surfactant is described. Formation of mixed monolayers consisting of polyelectrolyte-surfactant complex (PSC) and dye molecules-Nile Red (NR) at water-air interface is shown. Assembling conditions of LB films based on PSC and NR are defined and the spectral-luminescent properties of obtained films are studied. It is shown that when nonamphiphilic NR and PSC are mixed the excellent monolayers formed, which can easily be transferred onto solid substrates by Langmuir-Blodgett method with a high transfer coefficient. Absorption and fluorescence spectra of mixed LB films reveal the formation of dimers and existence of monomers in LB films.

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Organic thin film materials producing novel blue laser

Cited by 10 publications

References 15 publications

Electroluminescence in organics

Electroluminescence in organics

Emission properties of thin films of electroactive doped polymers

Fluorescencing behavior of thin solid films based on polyelectrolyte‐surfactant complex and dye molecules

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