Operating longevity of organic light-emitting diodes with perylene derivatives as aggregating light-emitting-layer additives: Expansion of the emission zone

Jarikov, Viktor V.; Young, Ralph H.; Vargas, J. Ramón; Brown, Christopher T.; Klubek, Kevin P.; Liao, Liang‐Sheng

doi:10.1063/1.2361086

Cited by 24 publications

(16 citation statements)

References 15 publications

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“…Ruberene:TPD [257], MADN:NPB [226], F4TCNQ:NPB [131,169], DSA_Ph:NPB [225]) combinations have all been employed with various levels of doping, leading in most cases to ~2x improvement in the 80% luminance lifetime in small molecule OLEDs (see table 2). One very successful method of improving device stability has been doping of the Alq 3 layer in small molecule OLEDs with other molecules including TPD [258], NPB [210], NPD [218], quadricone [209], styrlamine [225], DMQA [264], rubrene [257,265], DNP [266], Bphen [267], perylene [265][266], among many others [265]. This approach, however, is focused on combating the intrinsic degradation of Alq 3 by holes [168].…”

Section: Dopingmentioning

confidence: 99%

Dewetting Stability of ITO Surfaces in Organic Optoelectronic Devices

Turak¹

2013

Optoelectronics - Advanced Materials and Devices

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Heterojunctions are inherent in and essential to all molecular optoelectronic devices. In organic light emitting diodes OLEDs , the interfacial region between the active organic layers and the inorganic contacts plays a primary role in device performance, through the control of effective carrier injection and long term device reliability. In organic solar cells OPVs , heterojunctions play a defining role in all of the major processes charge separation relies on effective organic/organic interfaces charge transport is critically determined by the structure of the thin film, controlled by the organic/inorganic interfaces with substrates and charge extraction can only occur at high quality inorganic/organic interfaces at the electrodes. Studies of various organic/inorganic interfaces have indicated that a wide range of interfacial types are possible in organic optoelectronic devices. To foster the next generation of devices, it is critical to understand the connections between heterojunction structure and morphology, and device performance. This connection is especially important with regard to the interfacial stability and lifetime in organic optoelectronic devices. Control of the complex interactions and the microstructure at the electrode-organic interfaces would allow the optimization of performance and lifetime.In this chapter, we aim to review the current state of the art with regards to interfacial stability and control of the anode indium tin oxide electrode/active layer interfaces to understand the performance of organic optoelectronic devices. From examples of our own research and others relating to interfacial morphological changes, a comprehensive picture of the role of the interface in device stability can be formed. This chapter begins with a brief overview of degradation in organic devices, including definitions. Following that, the main focus of the chapter is on the morphological instability at the ITO surface as a main mechanisms of device degradation. Various approaches to overcoming device instability are given, © 2013 Turak; licensee InTech. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.with special attention paid to the various interlayers that have been introduced into devices. This also includes examples where dewetting is used advantageously to produce novel device architectures and surprising solutions to device degradation. . DegradationUnlike the field of inorganic electronics, organic electronics encompasses highly diverse technologies with devices that can be prepared with different architectures, using many different materials, processed by many different methods. Unlike their inorganic counterparts, all organic devices are to some extent unstable and their performance degrades over time [ ]. "fter efficiency, lifetime is the second most important parameter for o...

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Section: Dopingmentioning

confidence: 99%

Dewetting Stability of ITO Surfaces in Organic Optoelectronic Devices

Turak¹

2013

Optoelectronics - Advanced Materials and Devices

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“…The maximum external quantum efficiency of the OLED without MoO 3 was 1.1% at a current density of 66 mA/ cm 2 , which is in good agreement with those of previously reported OLEDs with an Alq 3 emitter. [46][47][48] However, the external quantum efficiencies decreased when the MoO 3 HIL was used ͑Fig. 3͒.…”

Section: A Characteristics Of Oleds With Various Thicknesses Of a Momentioning

confidence: 99%

Marked improvement in electroluminescence characteristics of organic light-emitting diodes using an ultrathin hole-injection layer of molybdenum oxide

Matsushima

Jin

Murata

2008

Journal of Applied Physics

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We show that the performance of organic light-emitting diodes ͑OLEDs͒ is markedly improved by optimizing the thickness of a hole-injection layer ͑HIL͒ of molybdenum oxide ͑MoO 3 ͒ inserted between indium tin oxide and N , NЈ-diphenyl-N , NЈ-bis͑1-naphthyl͒-1,1Ј-biphenyl-4 , 4Ј-diamine ͑␣-NPD͒. From results of the electroluminescence ͑EL͒ characteristics of OLEDs with various thicknesses of a MoO 3 HIL, we found that the OLED with a 0.75-nm-thick MoO 3 HIL had the lowest driving voltage and the highest power conversion efficiency among the OLEDs. Moreover, the operational lifetime of the OLED was improved by about a factor of 6 by using the 0.75-nm-thick MoO 3 HIL. These enhanced EL characteristics are attributable to the formation of an Ohmic contact at the interfaces composed of ITO/ MoO 3 / ␣-NPD.

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“…Most of perylene derivatives have been considered for applications in organic electronic devices (e.g. in OLEDs) [5][6][7][8] and in optical disks [9]. They can be also applied as a fluorescent component in liquid crystal displays working in passive or active modes [10].…”

Section: Introductionmentioning

confidence: 99%