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The effect of the interlayer design on the electroluminescence and electrical properties of n-ZnO nanorod/p-type blended polymer hybrid light emitting diodes
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-6235-7038
2009 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 20, no 6, 065710- p.Article in journal (Refereed) Published
Abstract [en]

Hybrid light emitting diodes (LEDs) based on n-ZnO nanorods and blended polymers were fabricated and characterized. The blended polymers consisted of a blue emitting polymer and a charge transport polymer. The effect of the interlayer design on the electrical and electroluminescent characteristics of these hybrid LEDs was investigated. We demonstrated that by adding a calcium (2) acetylacetonate [Ca(acac)(2)] layer between the blended polymer layer and the ZnO nanorods, an increase in device performance was observed. The purpose of the extra layer was to act as a band offset stepping layer (offset divider). Moreover, the effect of the stepper layer thickness for this offset stepping layer was studied. The results indicate that LED performance is greatly affected by the presence and thickness of this band offset stepping layer.

Place, publisher, year, edition, pages
2009. Vol. 20, no 6, 065710- p.
Keyword [en]
ZnO-nanorods, p-type polymer, LEDs
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-16614DOI: 10.1088/0957-4484/20/6/065710OAI: oai:DiVA.org:liu-16614DiVA: diva2:159520
Note
Original Publication: Amal Wadesa, Omer Nour and Magnus Willander, The effect of the interlayer design on the electroluminescence and electrical properties of n-ZnO nanorod/p-type blended polymer hybrid light emitting diodes, 2009, NANOTECHNOLOGY, (20), 6, 065710. http://dx.doi.org/10.1088/0957-4484/20/6/065710 Copyright: Institute of Physics http://www.iop.org/ Available from: 2009-02-11 Created: 2009-02-06 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Inorganic-Organic Hybrid Technology for Light Emitting Diodes
Open this publication in new window or tab >>Inorganic-Organic Hybrid Technology for Light Emitting Diodes
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Since the first report of inorganic light emtting diodes a century ago the field of inorganic light emitting diodes has evolved rapidly. T he development of light emitting diodes technology has caused their efficiency and light output to increase exponentially, with a doubling occuring about every 36 months  since the 1960s, in a similar way to Moor´s law. the advances are generally attributed to the parallel development of the semiconductor technologies and advances in optics and material science. This trend is normally called Haitz´s law after Dr. Roland Haitz.

on the other hand, during the last 30 years a new research and technology field of organic electronic materials has grown. Organic light emitting diodes is rapidly maturing for the development of large area light -emitting displays. The reasons behind that is the possibility of using uconventional substrates such as flexible plastic and glass and the availability of several very cheap production methods.

This thesis deals with the demonstration and investigation of heterjuction light emitting diodes (LEDs) based on n-ZnO-nanorod/p-polymer hybrid layered structures. The devices were fabricated using low cost and flexible substrates (glass and plastic substrates). Both ZnO-nanorods and the polymer materials were grown using low temperature methods. Different configurations were used starting with single polymer emissive layer ending up with separate emissive and blocking layers. In addition, blend multilayer structures were also used. In each case the advantages and disadvantages were investigated. analyzed and discussed. In general room temperature photoluminescence and electroluminescence spectra of the LEDs provided a broad emission band covering a wide color range (430nm- 700nm), in which zinc vacancies, oxygen vacancies and polymer emission peaks are contributting to the observed broad emission.

Place, publisher, year, edition, pages
Liu Tryck: Linköping University Electronic Press, 2009. 48 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1395
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-51600 (URN)LiU-TEK-LIC-2009:3 (Local ID)978-91-7393-688-0 (ISBN)LiU-TEK-LIC-2009:3 (Archive number)LiU-TEK-LIC-2009:3 (OAI)
Presentation
2009-02-13, Campus Norrköping, Linköpings universitet, Norrköping, 09:00 (English)
Opponent
Supervisors
Available from: 2010-01-25 Created: 2009-11-09 Last updated: 2014-01-15Bibliographically approved
2. Heterojunctions between zinc oxide nanostructures and organic semiconductor
Open this publication in new window or tab >>Heterojunctions between zinc oxide nanostructures and organic semiconductor
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lighting is a big business, lighting consumes considerable amount of the electricity. These facts motivate for the search of new illumination technologies that are efficient. Semiconductor light emitting diodes (LEDs) have huge potential to replace the traditional primary incandescent lighting sources. They are two basic types of semiconductor LEDs being explored: inorganic and organic semiconductor light emitting diodes. While electroluminescence from p-n junctions was discovered more than a century ago, it is only from the 1960s that their development has accelerated as indicated by an exponential increase of their efficiency and light output, with a doubling occurring about every 36 months, in a similar way to Moore's law in electronics. These advances are generally attributed to the parallel development of semiconductor technologies, optics and material science. Organic light emitting diodes (OLEDs) have rapidly matured during the last 30 years driven by the possibility to create large area light-emitting diodes and displays. Another driving force to specifically use semiconducting polymers is the possibility to build the OLED on conventional flexible substrates via low-cost manufacturing techniques such as printing techniques, which open the way for large area productions.

This thesis deals with the demonstration and investigation of heterojunction LEDs based on p-organic semiconductor and n-ZnO nanostructures. The ZnOorganic heterojunctions are fabricated using low cost and simple solution process without the need for sophisticated vacuum equipments. Both ZnO-nanostructures and the organic materials were grown on variety of substrates (i.e. silicon, glass and plastic substrates) using low temperature methods. The growth mechanism of the ZnO nanostructures has been systematically investigated with major focus in ZnO nanorods/nanowires. Different organic semiconductor materials and device configurations are explored starting with single polymer emissive layer ending up with separate emissive and blocking layers, or even blends. Interestingly, the photoluminescence and electroluminescence spectra of the hybrid LEDs provided a broad emission band covering entirely the visible spectrum [∼400-∼800nm]. The hybrid light emitting diode has a white emission attributed to ZnO intrinsic defects and impurities in combination with the electroluminescence from the conjugated polymers. The ZnO nanostructures in contact with a high workfunction electrode constitute an air stable electron injecting contact for the organic semiconductor. Hence, we have shown that a white light emission can be achieved in a ZnO-organic hybrid light emitting diode using cheap and low temperature growth techniques for both organic and inorganic materials.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 51 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1405
Keyword
ZnO nanostructures, Organic semiconductors, LEDs
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-71843 (URN)978-91-7393-046-8 (ISBN)
Public defence
2011-11-04, TP2, Täppan, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
Opponent
Supervisors
Note
The series number "1504" is incorrect and is changed in the electronic version to the correct number "1405".Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2013-09-12Bibliographically approved

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Wadesa, AmalNour, OmerWillander , Magnus

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