Electric field switching between blue-green and red cathodoluminescence in poly(4,4′- diphenylene diphenylvinylene) mixed with ZnO:Mg nanoparticles

Panin, G. N.; Kang, T. W.; Aleshin, A. N.; Baranov, A. N.; Oh, Y.-J.; Khotina, I. A.
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p113114
Academic Journal
We report the effect of reversible switching between blue-green and red cathodoluminescence (CL) in poly(4,4′-diphenylene diphenylvinylene) (PDPV), mixed with the 12–60 nm size ZnO:Mg nanoparticles by applying an electric field. We found that without electric field the CL emission maximum is in the blue-green region for a PDPV–ZnO:Mg composite deposited on Si–SiO2 substrate with gold electrodes. Application of positive bias suppressed the blue-green emission and shifted the emission maximum to the red region. The mechanism for the formation of the exited states in PDPV–ZnO:Mg structure implies the presence of radiative recombination channels, which can be controlled by an electric field.


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