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Transition Metal Oxides in Organic Light Emitting Diodes
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Transition Metal Oxides in Organic Light Emitting Diodes
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Transition Metal Oxides in Organic Light Emitting Diodes (Hardback or Cased Book)
Edité par
Cuvillier 10/15/2010, 2010
ISBN 10 : 3869554843
ISBN 13 : 9783869554846
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Hardback or Cased Book. Etat : New. Transition Metal Oxides in Organic Light Emitting Diodes. Book. N° de réf. du vendeur BBS-9783869554846
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Transition Metal Oxides in Organic Light Emitting Diodes
Edité par
Cuvillier, 2010
ISBN 10 : 3869554843
ISBN 13 : 9783869554846
Ancien ou d'occasion
Couverture rigide
Vendeur : GreatBookPrices, Columbia, MD, Etats-Unis
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Transition Metal Oxides in Organic Light Emitting Diodes
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Transition Metal Oxides in Organic Light Emitting Diodes
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Transition Metal Oxides in Organic Light Emitting Diodes
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Transition Metal Oxides in Organic Light Emitting Diodes
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Transition Metal Oxides in Organic Light Emitting Diodes
Edité par
Cuvillier, 2010
ISBN 10 : 3869554843
ISBN 13 : 9783869554846
Ancien ou d'occasion
Couverture rigide
Vendeur : GreatBookPricesUK, Woodford Green, Royaume-Uni
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Etat : As New. Unread book in perfect condition. N° de réf. du vendeur 26293748
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Transition Metal Oxides in Organic Light Emitting Diodes
Edité par
Cuvillier Okt 2010, 2010
ISBN 10 : 3869554843
ISBN 13 : 9783869554846
Neuf
Couverture rigide
Vendeur : BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Allemagne
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Buch. Etat : Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Organic light emitting diodes (OLEDs) exhibit several speci¿c properties such as an extremely thin design and a wide viewing angle, making them favorable for the application in display technology and general lighting. The development of OLEDs is strongly driven by the prospect of low-cost production of largearea applications in the future. Accordingly, their performance was considerably enhanced in terms of e¿ciency and lifetime over the past years. The introduction of transition metal oxides (TMOs) in OLEDs is regarded as a promising concept for further improving their properties due to their technological compatibility with organic layers and their high thermal stability. The ¿rst results from the insertion of TMOs in OLEDs indicate their versatile application as neat functional layers and electrochemical dopants of organic semiconductors. On the other hand, the knowledge of their electronic properties and the mode of operation in OLEDs is very limited so far. In this context, it becomes apparent that fundamental mechanisms such as the electrochemical doping of organic semiconductors or the charge generation in interconnecting units of stacked OLEDs are not yet completely clari¿ed. Thus, this work focuses on the physical and technological correlations arising from the application of transition metal oxides in organic light emitting diodes. First, the electronic structure of molybdenum oxide (MoO3) and tungsten oxide (WO3) is analyzed by photoelectron spectroscopy and Kelvin probe. It is demonstrated that both TMOs exhibit comparably deep-lying energy levels. Moreover, their electronic structure indicates them as intrinsically n-doped semiconductors. The functional principle of the e¿cient hole injection by neat layers of TMO is then studied by the examination of the interfaces between the TMO and its adjacent layers. As a result, a new model of hole injection by thin TMO layers is developed. The concept of electrochemical doping in OLEDs represents a very important technique to improve their overall e¿ciency. For that reason, the suitability of MoO3 as p-type dopant and Cs2CO3 (cesium carbonate) as n-type dopant of organic wide band gap semiconductors is studied,respectively. First, the impact of electrochemical doping on the electrical, optical and morphological properties is analyzed. The focus, however, is on the determination of the doping concentration dependent charge carrier densities. Measurement techniques, known from the world of inorganic semiconductors, such as capacitance voltage measurements on metal-insulator-semiconductor structures or the direct analysis of the space charge regionin doped semiconductors at the metallic electrode are applied for the determination of the densities and compared with each other. The study reveals an approximately linear increase of the charge carrier density with higher doping concentrations as a general result. At the same time, the doping e¿ciency of MoO3 is unexpectedly low and under ¿ve percent on average. The stacking of several light emitting units on top of each other is known to increase the lifetime of organic devices. Therefore, it is important to reveal the functional principle of the charge generation layers (CGL) as the interconnecting units of the stacked OLEDs. Besides the analysis of a complementarily doped homojunction-CGL, the role of neat layers of TMO in CGLs is investigated. The mechanism of charge generation between doped layers is explained by the formation of a space charge region. On the other hand, it is demonstrated that the actual charge generation in interconnecting units using transition metal oxides occurs at the interface between the TMO and the adjacent hole transporting layer. Finally, the investigations of the physical aspects in this work allowed for the realization of the ¿rst organic p-i-n homojunction device which operates both as violet light emitting diode and visible blind photodiode. 170 pp. Englisch. N° de réf. du vendeur 9783869554846
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