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The most important difference between these complexes is their molecular planarity; Li3BPP and Li4BPP adopt twisted bipyridine structures, whereas Li2BPP adopts a planar structure owing to the steric hindrance and chelating effect of bipyridine on the Li core. The planar structure leads to crystallization through π-π stacking interactions, and the small differences in the molecular structures of the pendant pyridine rings cause drastic differences in the physical properties of thin solid films of these complexes. We applied these complexes as electron-injection layers (EILs) in Ir(ppy)"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004233145956998","@type":"Researcher","foaf:name":[{"@value":"Satoru Ohisa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233145956995","@type":"Researcher","foaf:name":[{"@value":"Taichiro Karasawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233145956999","@type":"Researcher","foaf:name":[{"@value":"Yuichiro Watanabe"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233145956992","@type":"Researcher","foaf:name":[{"@value":"Tatsuya Ohsawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233145956996","@type":"Researcher","foaf:name":[{"@value":"Yong-Jin 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Koganezawa"}],"jpcoar:affiliationName":[{"@value":"Japan Synchrotron\rRadiation Research Institute (JASRI), SPring-8, 1-1-1\rKouto, Sayo, Hyogo 679-5198, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233145956993","@type":"Researcher","foaf:name":[{"@value":"Hisahiro Sasabe"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233145956994","@type":"Researcher","foaf:name":[{"@value":"Junji Kido"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"19448244"},{"@type":"EISSN","@value":"19448252"}],"prism:publicationName":[{"@value":"ACS Applied Materials & Interfaces"}],"dc:publisher":[{"@value":"American Chemical Society 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