Implementation of 'hole Confinement' for Efficient Inverted and Un-doped Bi-layer Organic Light Emitting Diodes Using a Buffer Layer

Download or read book Implementation of 'hole Confinement' for Efficient Inverted and Un-doped Bi-layer Organic Light Emitting Diodes Using a Buffer Layer written by Arunkumar Subramanian and published by . This book was released on 2011 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic Light Emitting Diode (OLED) technology has attracted a great deal of attention over the past ten years in the field of display and lighting. OLED have the advantage of being environment friendly, which is one of the major reasons for the large focus it is being given. The other advantages of displays made from OLEDs include low power consumption, light weight, flexibility, high brightness, high contrast, wide viewing angle and broad color gamut. The rapid growth in the field has led to efforts being devoted to improve OLED efficiency and lifetime and their compatibility. In this thesis we demonstrate improved efficiency of green and blue inverted OLEDs using the hole confining concept. Also the effect of adding a buffer layer of TPBI (1, 3, 5 - tri (phenyl - 2- benzimidazole) - benzene) to conventional green OLEDs is discussed. In the first part, the various steps involved in the fabrication of inverted green and blue OLEDs are discussed. Then the concept of hole confinement is discussed and the luminance of inverted OLEDs is improved by using BCP (Bathocuproine) as the hole confining layer. In the second part the hole confinement concept is implemented on conventional green light emitting OLED using a buffer layer of TPBI. Further, the effect of having a constant emitting layer thickness and variation of TPBI layer thickness is also discussed. Finally, suggestions for future work are offered.