AVS 52nd International Symposium
    Electronic Materials and Processing Tuesday Sessions
       Session EM-TuP

Paper EM-TuP10
Highly-efficient Top-emission Organic Light-emitting Diodes Using Alkali Metal as an Electron-injecting Layer and Their Semi-passivation

Tuesday, November 1, 2005, 4:00 pm, Room Exhibit Hall C&D

Session: Electronic Materials and Processing Poster Session
Presenter: J.T. Lim, Sungkyunkwan University, Korea
Authors: J.T. Lim, Sungkyunkwan University, Korea
C.H. Jeong, Sungkyunkwan University, Korea
J.H. Lee, Sungkyunkwan University, Korea
J.H. Lim, Sungkyunkwan University, Korea
G.Y. Yeom, Sungkyunkwan University, Korea
Correspondent: Click to Email
To obtain high-performance top-emission organic light-emitting diodes (TEOLEDs) with a high aperture ratio and high resolution, a device consisted of glass/ITO/2-TNATA (60 nm)/NPB (15 nm)/Alq@sub3@ (45 nm)/alkali metal (x nm)/Al (2 nm)/Ag (10-y nm)/Au (y nm)/Alq@sub3@ (53 nm) was fabricated. Especially, in this study, alkali metals such as Li and Cs with a low work function was used to reduce the energy barrier from the cathode into the organic layers by electron hopping and the top Alq@sub3@ layer was used to passivate the semitransparent conducting protecting layer (STCPL) composed of alkali metal/Al/Ag/Au and organic layers from the hostile environment. The Ag layer composing of STCPL was introduced into TEOLED to improve the adhesion between the Al layer and the Au layer. In this study, the characteristics of STCPL composed of TEOLEDs were investigated using a four-point probe and a UV-spectroscopy to measure the resistivity and the transmittance, respectively. Also, the current-voltage-luminance characteristics and electroluminescent spectra of the TEOLEDs semi-passivated with the Alq@sub3@ layer were investigated.