Effects of cathode thickness and thermal treatment on the design of balanced blue light-emitting polymer device

Byung Doo Chin; Lian Duan; Moo-Hyun Kim; Seong Taek Lee; Ho Kyoon Chung
November 2004
Applied Physics Letters;11/8/2004, Vol. 85 Issue 19, p4496
Academic Journal
The interface between layered conjugated polymer and electrode is a most important factor to improve the performance and lifetime of polymeric light-emitting devices (PLEDs). In this work, a blue PLED with improved stability was achieved by the combination of optimized cathode structure as well as thermal treatment of light-emitting polymer (LEP). Experimental evidence of the initial luminance “settling in” stage was found to be dependent upon the cathode structure, while the long-term slope of luminance as a function of elapsed time is governed by the annealing conditions. Our study revealed the importance of extrinsic design of device for the improvement of PLED stability. Experimental data shows that a blue PLED annealed at 170 °C and 6 nm LiF at LiF/Ca/Al cathode retained the best lifetime, which can be explained by the improved polymer–metal interface and LEP’s charge mobility.


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