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JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 39, Issue 16, Pages 3582-3587Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/39/16/009
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We present the optoelectronic properties of composites made of a europium(III) complex, Eu(NTA)(3)phen (where NTA=1-(2-naphthoyl)-3,3,3-trifluoroacetonate; phen=1,10-phenantroline), dispersed in three electroluminescent polymers, namely, poly(N-vinylcarbazole), poly(9,9-dioctylfluorene) and poly(9,9-dioctylfluorene-alt-benzothiadiazole). We find that the photo- and electroluminescence (EL) properties of these composites are well rationalized in terms of the relative position of the frontier levels of the host polymers and of the europium complex. We find also that charge recombination at the europium complex sites plays a key role on the EL properties of the composites.
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