Journal
NANO LETTERS
Volume 6, Issue 6, Pages 1202-1206Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl060583w
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Utilizing scanning transmission X-ray microscopy (STXM), we present a quantitative chemical analysis of the bulk composition of spin-coated blends of poly(9,9-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine) (TFB) and poly(9,9'-dioctylfluorene-co-benzothiadiazole) (F8BT) used in efficient polymer light emitting diodes. With a lateral resolution of 50 nm, we reveal nanoscale subsurface chemical structure and show that in particular while blend composition remains constant within the TFB-rich domain, in the F8BT- rich phase there is an enrichment of F8BT at the domain interface.
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