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Fabrication of NPB/Alq 3 small‐molecule multilayer structures with suppressed interface mixing by multi‐jet mode electrospray deposition
Author(s) -
Ueda Hiroyuki,
Takatsuka Yusuke,
Niinuma Yoshiki,
Terada Ryo,
Kikuchi Akihiko
Publication year - 2017
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600564
Subject(s) - deposition (geology) , electrospray , materials science , layer (electronics) , fabrication , jet (fluid) , mixing (physics) , analytical chemistry (journal) , optoelectronics , chemistry , nanotechnology , mass spectrometry , chromatography , medicine , paleontology , alternative medicine , physics , pathology , sediment , biology , thermodynamics , quantum mechanics
In this study, we investigated the multi‐jet mode modified electrospray deposition (ESD) production of NPB/Alq 3 small‐molecule multilayer structures with suppressed interface mixing, using common solvents. Observations of the initial deposition stage and analysis of the photoluminescence spectra of the multilayer structure were conducted. It was demonstrated that, by optimizing the deposition conditions, surface erosion of the NPB layer and the initiation of interface mixing between the NPB and Alq 3 layers could be suppressed. A 55‐nm NPB/60‐nm Alq 3 multilayer structure with suppressed intermixing and smooth surface morphology (RMS roughness of 3.9 nm) was obtained at the lowest levels of under‐layer erosion. Schematic of a modified electrospray (nanomist deposition: NMD) system and an NPB/Alq 3 multilayer structure deposited by NMD.