Inhibition of dark quenching by TiO2 nanoparticles content in novel PFO/Fluorol 7GA hybrid: A new role to improve OLED performance

Improving Photophysical Properties of White Emitting Ternary Conjugated Polymer Blend Thin Film via Additions of TiO2 Nanoparticles

“…Consequently, the quenching effect of the heterodimers was inhibited as discussed below. A similar observation has been reported in an earlier work [ 19 ].…”

“…The constant presence of this peak proved that the existence of β-phase in the blends was unaffected. Based on both general observations, it appeared that the absorption capacity of the ternary blends is insensitive to the tiny additions of acceptors [ 19 ]. However, close observation revealed the formation of a new broad absorption peak.…”

“…Despite complete energy transfer, the successive reductions in intensities for green and red emissions were recorded in both thin films. These reductions are likely due to the exciplexes (heterodimerics) creation at high acceptor concentration [ 19 ]. Besides, it could also be due to the active self-quenching in the blends resulting from the creation of excimers (homodimers) between acceptor monomers [ 29 ] which then converted into heat.…”

“…One of the important data that can be extracted from Figure 4 is that the emission intensities of the acceptors can be enhanced if the donor’s emission quenching can be reversed. The reversal quenching trend in emission of donor has been observed in different binary blend thin films [ 8 , 19 , 20 ]. In these works, the general emission of the binary blend thin film was remarkably improved.…”

“…Earlier efforts to overcome this drawback in the binary blends proved that the addition of metal oxide nanoparticles, particularly TiO 2 effectively inhibited the emission quenching. More interestingly, the presence of the nanoparticles at an appropriate amount stimulated the creation of excitons specifically in the donor and thus improved the overall emissions intensities of the blend [ 8 , 19 , 20 ]. The electron trapping effect has been proposed as the underlying explanation for the observed improvement.…”