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Article: Efficient Red Electroluminescent Devices with Sterically Hindered Phosphorescent Platinum(II) Schiff Base Complexes and Iridium Complex Codopant

TitleEfficient Red Electroluminescent Devices with Sterically Hindered Phosphorescent Platinum(II) Schiff Base Complexes and Iridium Complex Codopant
Authors
Issue Date2014
PublisherWiley.
Citation
Chemistry - An Asian Journal, 2014, v. 9, p. 2984-2994 How to Cite?
AbstractSterically hindered platinum(II) Schiff base complexes were prepared. Complex 4, which displays red emission with a quantum yield of 0.29 in a thin film and a self-quenching rate constant of 1×10−7 dm3 mol−1 s−1, was used to fabricate organic light-emitting diodes with single or double emissive layers (EMLs). An iridium(III) complex with a wide band gap was codoped into the electron-dominant EML to act as a deep electron trapper, and red-light-emitting devices with the highest current, power, and external quantum efficiencies of 20.43 cd A−1 18.33 Lm W−1, and 11.7 %, respectively, were fabricated. A high current efficiency and EQE of up to 14.69 cd A−1 and 8.3 %, respectively, were achieved at a high brightness of 1000 cd m−2. The significant delay of efficiency roll-off is attributed to the bulky 3D structure of the norbornene moiety at the periphery of the Schiff base ligand of 4 and to the new device design strategy. The fabricated device had a projected lifetime (LT50) of 18 000 h.
Persistent Identifierhttp://hdl.handle.net/10722/215132

 

DC FieldValueLanguage
dc.contributor.authorZhou, L-
dc.contributor.authorKwong, CL-
dc.contributor.authorKwok, CC-
dc.contributor.authorCheng, G-
dc.contributor.authorZhang, H-
dc.contributor.authorChe, CM-
dc.date.accessioned2015-08-21T13:15:15Z-
dc.date.available2015-08-21T13:15:15Z-
dc.date.issued2014-
dc.identifier.citationChemistry - An Asian Journal, 2014, v. 9, p. 2984-2994-
dc.identifier.urihttp://hdl.handle.net/10722/215132-
dc.description.abstractSterically hindered platinum(II) Schiff base complexes were prepared. Complex 4, which displays red emission with a quantum yield of 0.29 in a thin film and a self-quenching rate constant of 1×10−7 dm3 mol−1 s−1, was used to fabricate organic light-emitting diodes with single or double emissive layers (EMLs). An iridium(III) complex with a wide band gap was codoped into the electron-dominant EML to act as a deep electron trapper, and red-light-emitting devices with the highest current, power, and external quantum efficiencies of 20.43 cd A−1 18.33 Lm W−1, and 11.7 %, respectively, were fabricated. A high current efficiency and EQE of up to 14.69 cd A−1 and 8.3 %, respectively, were achieved at a high brightness of 1000 cd m−2. The significant delay of efficiency roll-off is attributed to the bulky 3D structure of the norbornene moiety at the periphery of the Schiff base ligand of 4 and to the new device design strategy. The fabricated device had a projected lifetime (LT50) of 18 000 h.-
dc.languageeng-
dc.publisherWiley.-
dc.relation.ispartofChemistry - An Asian Journal-
dc.rightsPreprint This is the pre-peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article]. Authors are not required to remove preprints posted prior to acceptance of the submitted version. Postprint This is the accepted version of the following article: [full citation], which has been published in final form at [Link to final article]. In addition, authors may also transmit, print and share copies with colleagues, provided that there is no systematic distribution of the submitted version, e.g. posting on a listserve, network or automated delivery.-
dc.titleEfficient Red Electroluminescent Devices with Sterically Hindered Phosphorescent Platinum(II) Schiff Base Complexes and Iridium Complex Codopant-
dc.typeArticle-
dc.identifier.emailKwok, CC: cckwok@hku.hk-
dc.identifier.emailCheng, G: ggcheng@hku.hk-
dc.identifier.emailChe, CM: cmche@hku.hk-
dc.identifier.authorityKwok, CC=rp00847-
dc.identifier.authorityChe, CM=rp00670-
dc.identifier.doi10.1002/asia.201402618-
dc.identifier.hkuros246790-
dc.identifier.volume9-
dc.identifier.spage2984-
dc.identifier.epage2994-
dc.publisher.placeWeinheim, Germany-

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