High-Efficiency Polycrystalline Perovskite Light-Emitting Diodes Based on Mixed Cations.

We have achieved high-efficiency polycrystalline perovskite light-emitting diodes (PeLEDs) based on formamidinium (FA) and cesium (Cs) mixed cations without quantum dot synthesis. Uniform single-phase FACs PbBr polycrystalline films were fabricated by one-step formation with various FA:Cs molar proportions; then the influences of chemical composition on film morphology, crystal structure, photoluminescence (PL), and electroluminescence (EL) were systematically investigated. Incorporation of Cs cations in FAPbBr significantly reduced the average grain size (to 199 nm for FA:Cs = 90:10) and trap density; these changes consequently increased PL quantum efficiency (PLQE) and PL lifetime of FACs PbBr films and current efficiency (CE) of PeLEDs.

Facile Fabrication of Ultra-Stretchable Metallic Nanocluster Films for Wearable Electronics.

With recent progress in flexible electronics, developing facile one-step techniques for fabricating stretchable conductors and interconnects remain essential. It is also desirable for these processes to have a small number of processing steps, incorporate micropatterning, and be capable of being effortlessly implemented for manufacturing of wearable logic circuits. A low vacuum flash evaporation of Au nanoclusters is proposed as a facile method to fabricate highly stretchable conductors capable of fulfilling all such requirements.

Organic soluble and uniform film forming oligoethylene glycol substituted BODIPY small molecules with improved hole mobility.

Judiciously chosen side chains of conjugated molecules have a positive impact on charge transport properties when used as the active material in organic electronic devices. Amongst the side chains, oligoethylene glycols (OEGs) have been relatively unexplored due to their hydrophilic nature. OEGs also affect the smooth film formation of conjugated molecules, which preclude device fabrication.

Neuronal differentiation of embryonic stem cell derived neuronal progenitors can be regulated by stretchable conducting polymers.

Electrically conducting polymers are prospective candidates as active substrates for the development of neuroprosthetic devices. The utility of these substrates for promoting differentiation of embryonic stem cells paves viable routes for regenerative medicine. Here, we have tuned the electrical and mechanical cues provided to the embryonic stem cells during differentiation by precisely straining the conducting polymer (CP) coated, elastomeric-substrate.