Intrinsically stretchable three primary light-emitting films enabled by elastomer blend for polymer light-emitting diodes

Abstract

Intrinsically stretchable light-emitting materials are crucial for skin-like wearable displays; however, their color range has been limited to green-like yellow lights owing to the restricted stretchable light-emitting materials (super yellow series materials). To develop skin-like full-color displays, three intrinsically stretchable primary light-emitting materials [red, green, and blue (RGB)] are essential. In this study, we report three highly stretchable primary light-emitting films made from a polymer blend of conventional RGB light-emitting polymers and a nonpolar elastomer. The blend films consist of multidimensional nanodomains of light-emitting polymers that are interconnected in an elastomer matrix for efficient light-emitting under strain. The RGB blend films exhibited over 1000 cd/m 2 luminance with low turn-on voltage (<5 V on ) and the selectively stretched blend films on rigid substrate maintained stable light-emitting performance up to 100% strain even after 1000 multiple stretching cycles.

A water-resistant, ultrathin, conformable organic photodetector for vital sign monitoring

“…The exemplified application of stable PPG signals acquirement even after extended exposure to an aqueous environment showcases its potential for reliable vital sign monitoring, thus expanding the working scenarios of ultrathin OPDs, including the possibility of use in implantable devices. In particular, given the fact that SEBS has been widely used in various organic electronics for stretchability engineering ( 53 – 56 ), its unexpected advantage in improving ultrathin device water resistance holds profound promise. This exceptional advantage could inspire further advancements in organic electronics, facilitating the development of reliable on-skin sensors capable of stable operation under harsh conditions.…”

Intrinsically stretchable and efficient cross-linked small molecular emitter for flexible organic light-emitting diodes

“…In general, establishing an energy dissipation centre is crucial for enhancing the capacity of organic conjugated molecules to resist device deformation in flexible electronics. 7,16,22,28–32 It is well known that the interpenetration and entanglement of conjugated polymeric chains presents the potential for intrinsic stretchability in the solid state. 3,12,22,28,31,33–38 As an alternative to π-conjugated polymers, small-molecule semiconductors are easily synthesized and functionalized with a definite chemical structure, which endows the materials with unique physical, chemical and photoelectric properties.…”

Stretchable phosphorescent polymers by multiphase engineering

“…1a ) 5 – 9 . To date, most of the reported stretchable emitters are based on fluorescent polymers that only harness singlet excitons and suffer from short lifetimes 10 – 12 . Rare stretchable phosphorescent materials for advanced applications have been developed.…”