Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 51, Issue 10, Pages 1562-1569Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2004.835161
Keywords
multilayer structure; organic polymer red light-emitting devices (PLEDs); plastic substrate
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In this paper, we report on the multilayer poly (fluorene) co-polymer red light-emitting devices (PLEDs) fabricated on flexible plastic substrates. An organic hole transport layer (HTL) is inserted between PEDOT:PSS hole injection (HIL) and light-emissive layers (LEL). Since the highest occupied molecular orbital (HOMO) of the HTL is located between those of HIL and LEL, the insertion of HTL reduces the effective HOMO level offset between HIL and LEL, reducing the device operation voltage and producing comparable or better device efficiencies in comparison with the conventional PEDOT:PSS-only devices. Maximum emission efficiency, similar to0.8 cd/A, power efficiency, similar to0.7 lm/W, and external quantum efficiency, similar to1.5%, have been obtained for multilayer red PLEDs.
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