TITLE

Organic single-layer white light-emitting diodes by exciplex emission from spin-coated blends of blue-emitting molecules

AUTHOR(S)
Mazzeo, M.; Pisignano, D.; Della Sala, F.; Thompson, J.; Blyth, R. I. R.; Gigli, G.; Cingolani, R.; Sotgiu, G.; Barbarella, G.
PUB. DATE
January 2003
SOURCE
Applied Physics Letters;1/20/2003, Vol. 82 Issue 3, p334
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on white electroluminescence (EL) emission from a single-layer light-emitting diode based on a binary blend of organic soluble blue-emitting molecules, i.e., a diamine derivative and a substituted thiophene-1,1-dioxide. Weakly voltage-dependent white color, of coordinates (0.39, 0.40) according to the standard of the Commission Internationale de l'Eclairage, is obtained from the superposition of the blue emission from the donor and a low-energy peak due to a charge-transfer complex between the two molecules (exciplex). The EL spectrum is broader and more structured than the photoluminescence one: this could be due to the activation of exciplexes with different conformations as inferred from quantum-chemistry calculations.
ACCESSION #
8926086

 

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