Fabrication and characterization of perylene diimide doped polyfluorene based solution processed blue organic light emitting diodes
tarafından
Utlu, Sevde Nur, author.
Başlık
:
Fabrication and characterization of perylene diimide doped polyfluorene based solution processed blue organic light emitting diodes
Yazar
:
Utlu, Sevde Nur, author.
Yazar Ek Girişi
:
Utlu, Sevde Nur, author.
Fiziksel Tanımlama
:
xiii, 61 leaves: illustrarions, charts; 29 cm + 1 computer laser optical disc.
Özet
:
Blue is considered as the major component in many applications of organic light emitting diodes (OLEDs). Most of the polymeric BEs including poli[9,9-di-(2-diethylhexyl)-fluorenyl-2,7-diyl] (ADS231BE) attract attention with their solubility and potential in reducing the application costs, but also suffer from wide electroluminescence resulting in color purity issues. Annealing temperature and solvent choice have great influence on morphology and electronic properties. A typical OLED is fabricated by using ADS231BE as the emitter material and effect of annealing temperature on EL properties is investigated between 60C and 150C. OLEDs produced using toluene have shown better efficiency compared to those using chlorobenzene. Regardless of the solvent used, the efficiencies gradually decreased, but the stability and color purity of the devices increased with increasing annealing temperatures. Surface morphologies were examined, and suitable coating conditions were determined. Small molecule orange-red-emitting N,N’-bis(2-ethylhexyl)perylene-3,4,9,10-dicarboxylic diimide (PDI) derivatives were introduced into the blue-emitting conjugated polymer ADS231BE at a concentration of 0.1 wt.%. Electroluminescence, morphology, photoluminescence and Raman analysis of the developed devices were completed to determine the type of aggregation and conformational change caused by PDI doping. Subsequently, to balance charge and improve the electroluminescent character of the devices, a hole transfer layer (HTL) consisting of Poly (N-vinyl carbazole) (PVK) and PVK:1,3-Bis(N-carbazolyl) benzene (mCP) was added to the device structure. Similar morphological and Raman analyses were performed. Compared to the bare ADS231BE containing devices, without changing the CIE coordinate values, approximately, 10 folds of luminance and more than 5 folds of EQE increments were obtained
Konu Başlığı
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Light emitting diodes
Organic thin films
Polymers
Yazar Ek Girişi
:
Varlıklı, Canan,
Demir, Mustafa Muammer,
Tüzel Kişi Ek Girişi
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İzmir Institute of Technology. Photonics Science and Engineering.
Tek Biçim Eser Adı
:
Thesis (Master)-- İzmir Institute of Technology: Photonics Science and Engineering.
İzmir Institute of Technology: Photonics Science and Engineering. (Master).
Elektronik Erişim
:
Library | Materyal Türü | Demirbaş Numarası | Yer Numarası | Durumu/İade Tarihi |
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IYTE Library | Tez | T002844 | TK7871.89.L53 U91 2023 | Tez Koleksiyonu |