Thin Film Organic Structures
Thin-Film Organic Structures for Electro-Luminescent Civilian Appliances
Tech Area / Field
- MAT-ELE/Organic and Electronics Materials/Materials
3 Approved without Funding
FIAN Lebedev, Russia, Moscow
- Institute of Synthetic Polymer Materilals, Russia, Moscow\nVNIIEF, Russia, N. Novgorod reg., Sarov
- Los-Alamos National Laboratory, USA, NM, Los-Alamos
Project summaryOrganic electroluminescent (EL) materials have attracted much attention over past years because of their potential application as effective, low-cost and easily processible luminescent devices. These materials often possess unusual solid state properties, which could be used in non-linear optics, light harvesting and photoexcitation energy conversion systems.
The motivation of the research in this field is essentially twofold. On fundamental level, there is a wealth of new solid state chemistry and physics to be uncovered. Practically, there is the potential for technological applications in the rapidly expanding field of molecular electronics.
Organic EL has been recognized to be generated by recombination between holes and electrons, which are injected from an anode and a cathode, respectively. It was shown that the use of a more sophisticated multilayered device structure with vacuum-deposited non-crystalline films could produce high efficiency devices with emission throughout the visible spectrum
The Proposal goals are the creation and complex study of new perspective materials for EL devices by joint effort physicists, chemists and technicians. The basic idea is to create low-dimensional structures which have the desired electronic properties and to modify their steric demand in such a way that their processability and morphologic stability will improve, while electronic properties are retained. In frame of common Project we plan:
1. To select, synthesize and test of different and new polymer materials (dendrimers, polyamides, polybenzimidazoles, polyphenylenes, carbazol dyes, etc.) for EL cells.
2. To prepare of new types of EL cells and substrates by different methods from polymer and related organic films using the powerful facilities of VNIIEF.
3. То apply the Langmuir-Blodgett technique for the construction of EL cells or fragments of them.
4. To use the laser irradiation and other techniques for specific polymerization processes of new type of materials for EL cells.
5. To study of electron and hole transport in electron transporting (ETL) and hole transporting (HTL) layers respectively, fluorescence quenching processes, the boundary effects, exciton transfer to the traps and to doped dye molecules and clusters in sandwich and low-dimensional molecular systems by laser time-resolved spectroscopy methods in wide temperature range
6. То develop the theoretical model and the computer simulation of the optical and the electrical properties of low-dimensional molecular multilayer systems (planar EL cells mainly)
At last stage of our Project we will summarize our findings of new polymer materials for EL cells, optimal constructions of EL cells and recommendations of EL cells improving, based on fundamental physics approaches
Important finding in two general areas are expected from proposed Project. They are (1) the development of new basic physical knowledge concerning electron and exciton processes in multylayer organic systems and (2) creation the new types EL cells based on modern polymers corresponding to potential civilian application as light emitting diodes and displays.
The Project based on previous co-operation of RAN group with Los Alamos National Laboratory (LANL, USA, Agreement 89Q890004-35, Dr.Darryl L.Smith) and long successful common work with Lab headed by Prof.Mark Van der Auweraer (Leuven University, Belgium) in frame several European Projects (INTAS 93-0085, INTAS 93-0085ext).
The role of Dr.Smith's group in this project is connected with theoretical approaches of novel molecular systems for EL cells based on mixed J-aggregates with conjugated polymers and small molecules of Alq3. The electronic properties of polyphenylsilane dendrimers are attractive for this group as well.
The group of Prof.M.Van der Auweraer has a large experience for investigation of electron transfer in molecular systems. The construction by his group of the various EL cells by different techniques as mixed THIATS (J-aggregates) with PPV (conjugated polymers) and with small molecules of Alq3 has the common interest for all participants of the Project. The femtosecond facilities of Belgian group in combination with equipment of FIAN and VNIIEF groups are to be used for EL cells (or their fragments) studies.
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