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

Paper EM-TuP9
Organic Light Emitting Diodes Using Alkaline-earth Metals 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: C.H. Jeong, Sungkyunkwan University, Korea
Authors: C.H. Jeong, Sungkyunkwan University, Korea
J.T. Lim, Sungkyunkwan University, Korea
J.H. Lee, Sungkyunkwan University, Korea
J.H. Lim, Sungkyunkwan University, Korea
G.Y. Yeom, Sungkyunkwan University, Korea
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To obtain the high performance characteristics of the top-emitting organic light-emitting diodes (TEOLEDs) based on an electron-injecting layer of alkaline-earth metal with a low work function, devices 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) were fabricated, where, alkaline-earth metals such as Ba, Ca, and Mg were used to reduce the energy barrier from the cathode into the organic layers by electron hopping. The top Alq@sub3@ layer was used to passivate the semitransparent conducting protecting layer (STCPL) composed of alkaline-earth metal/Al/Ag/Au and organic layers from the damaging environment. In addition, the Ag layer composed of STCPL was introduced into TEOLED to improve the adhesion between the Al layer and the Au layer. In this study, the electrical characteristics of the fabricated TEOLEDs semi-passivated with the Alq@sub3@ were measured using an electrometer and the luminescence characteristics were determined by measuring the photocurrent induced by light emission from the OLEDs using a picoammeter. Other properties such as optical transmittance and resistivity were measured using a UV-spectrometer and a four point probe, respectively.