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Polymer light-emitting diodes with a phenyleneethynylene derivative as a novel hole blocking layer for efficiency enhancements

Abstract : This paper reports on the use of an electron transport layer (ETL) in polymer light-emitting diodes based on poly(2,5-bis(3',7'-dimethyl-octyloxy)l,4-phenylene-vinylene) (BDMO-PPV). This ETL is inserted between BDMO-PPV and a calcium cathode as a hole blocking layer (HBL). A novel phenyleneethynylene derivative (ImPE) is proposed and compared to well-known materials such as tris(8-hydroxyquinoline) aluminum (Alq[3]) and bathocuproine (BCP). Efficient hole blocking is achieved leading to yield improvements at low luminances. With a 8 nm-thick ImPE layer, at 1 cd/m[2], the power efficiency reaches 1.2 lm/W whereas a BDMO-PPV-only PLED exhibits a 0.13 lm/W power efficiency. ImPE enables to reach higher performances than Alq[3] for low luminances (<20 cd/m[2]). However, for luminances higher than 350 cd/m[2], it is demonstrated that the hole blocking in no more efficient because of a too strong electric field.
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https://hal.archives-ouvertes.fr/hal-00163119
Contributor : Olivier Dautel Connect in order to contact the contributor
Submitted on : Monday, July 16, 2007 - 5:28:53 PM
Last modification on : Tuesday, December 7, 2021 - 12:46:03 PM

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Guillaume Wantz, Olivier Dautel, Laurence Vignau, Françoise Serein-Spirau, Jean-Pierre Lère-Porte, et al.. Polymer light-emitting diodes with a phenyleneethynylene derivative as a novel hole blocking layer for efficiency enhancements. Synthetic Metals, Elsevier, 2006, 156 (9-10), pp.690-694. ⟨10.1016/j.synthmet.2006.03.007⟩. ⟨hal-00163119⟩

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