Abstract
Solid-state, single-component green light-emitting electrochemical
cells (LECs) based on a fluorene-benzothiadiazole copolymer has been successfully
demonstrated. The solubilizing side groups are octyl and 2-(2-(2-methoxyethoxy)ethoxy)ethyl,
with the latter introduced to promote ionic conductivity necessary for the
operation of the LECs. The copolymer was synthesized by Suzuki coupling reactions
with number-average molecular weight between 5,600 and 13,200 and polydispersity
between 2.06 and 3.21. The LECs were fabricated by spin-coating the copolymer
admixed with lithium trifluoromethanesulfonate onto indium-tin oxide (ITO)
substrate coated with polyethylenedioxythiophene-polystyrene sulfonic acid
(PEDOT:PSS). The opposite electrode was vapor evaporated aluminum. The LEC
devices shows green electroluminescence with CIE coordinates of (0.37, 0.59).
The devices exhibit comparable performance with corresponding light emitting
diodes using evaporated barium as cathode. The copolymer with higher benzothiadiazole
(BT) content shows relatively higher LEC device performance. Cyclic voltammetry
and chemical doping measurements indicate that the polymer with higher BT
content in the backbone can be more readily n-doped,
which is consistent with the higher LEC performance.
© 2013 IEEE
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