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Home > Science, Technology & Agriculture > Energy technology and engineering > Electrical engineering > Device Optimization Studies of Organic Light Emitting Devices: (English)
Device Optimization Studies of Organic Light Emitting Devices: (English)

Device Optimization Studies of Organic Light Emitting Devices: (English)

          
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About the Book

This dissertation, "Device Optimization Studies of Organic Light Emitting Devices" by Kwun-nam, Hui, 許冠南, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Device optimization studies of organic light emitting devices Submitted by HUI Kwun Nam for the Degree of Master of Philosophy in the Department of Electrical and Electronic Engineering at The University of Hong Kong in November 2005 Organic light emitting devices (OLEDs) based on small molecular emissive materials have recently attracted significant attention from both academia and industry because of their potential to replace current display technologies. In addition to low fabrication costs, OLEDs offer excellent brightness, fast video rate responsiveness and a wide viewing angle for the prospect of flexible and light-weight displays. However outstanding challenges in the efficiency and stability still remain due to the imbalance of the number of carriers in devices and the sensitivity of the organic thin film (especially small molecules) to oxygen and water respectively. The objective of the research work presented in this thesis is to investigate the parameters of OLEDs particularly the energy barriers between organic materials, carrier injection and transport. As a result, high performance OLEDs, both in efficiency and stability, can be obtained. The study focuses on enhancing the carrier injection and transport of tris-(8-hydroxyquinoline) aluminum (Alq ) based OLEDs through device design. Novel structures of OLEDs fabricated in various structures are investigated, including structures utilizing different metallophthalocyanines (MPcs) as a single hole injection layer or a double hole injection layer (d-HIL), and structures based on a co-host electron transport layer (co-host ETL) of 4,7-diphenyl-1,10-phenanthroline (BPhen) and Alq . The study demonstrates that high performance OLEDs can be obtained either by minimizing the energy barrier at ITO/HTL and limiting the flow of the number of holes, or by enhancing the electron mobility of electron transport layer in the devices. Following a control-experiment approach, new devices using different metallophthalocyanines (MPcs) as a single hole injection layer or a double hole injection layer (d-HIL) show higher efficiency than the reference device. Compared to a current efficiency of 3.29 cd/A and a power efficiency of 0.99 lm/W (at 100 cd/m luminance) of the reference device, devices with d-HIL structures show higher efficiency than the reference device. The highest current efficiency 4.02 cd/A corresponds to the 15 nm ZnPc HIL device. New devices adopting the use of co-host electron transport layer (ETL) consisting of 4,7-diphenyl-1,10-phenanthroline (BPhen) and tris (8-hydroxyquinoline) aluminum (Alq ), result in 23% higher current efficiency and 63% higher power efficiency than the reference device. The co-host ETL structure is further applied to C540 doped OLEDs. Through an accelerated degradation test, a device half-life is enhanced by a factor of 2.5 in the case of C540 doped co-host system. Significant efficiency and stability improvement are obtained in the co-host ETL structure. To conclude, optimizing the parameters such as minimizing the energy barrier at ITO/HTL, limiting the flow of the number of holes, and enhancing the electron mobility of electron transport layer are essential to obtain high efficiency OLEDs. DOI: 10.5353/th_b3657848 Subjects: Light emitting dio


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Product Details
  • ISBN-13: 9781361419953
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 104
  • Spine Width: 6 mm
  • Width: 216 mm
  • ISBN-10: 1361419954
  • Publisher Date: 27 Jan 2017
  • Binding: Paperback
  • Language: English
  • Series Title: English
  • Weight: 263 gr


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