Abstract
We demonstrated a novel strategy for the preparation of light down-converter by combining rod-coil block copolymers with perovskite quantum dots (QDs) through electrospinning. Reports have shown that polymer deformability can be enhanced by incorporating a soft segment and controlled by varying the rod/coil ratio. Therefore, we first synthesized the rod-coil block copolymer through the click reaction of polyfluorene (PF) and poly(n-butyl acrylate) (PBA). Next, the CsPbBr3@PF8k-b-PBA12k composite fibers were fabricated by blending perovskite through electrospinning. Optical spectral evidence demonstrated the success of the strategy, as light down-converters were prepared through the controlled variance of QD/polymer ratios to achieve tunable color and stretchability. This result reveals the potential of using rod-coil block copolymers to fabricate color-tunable perovskite light down-converters.
Highlights
Several organic semiconducting materials have been studied due to their potential beneficial properties, such as solution processability [1,2], band gap tuning [3,4,5], chemical structure, and self-assembly [6,7]
Our lab developed a series of block copolymers, such as: poly(3-hexylthiophene)-block-poly(n-butyl acrylate) (P3HT-b-PBA) and polyfluorene-block-poly(pendent isoindigo) (PF-b-Piso) for stretchable field-effect transistor and resistive memory applications [25,26]. In both of the cited studies, the materials were designed and synthesized through the copper-catalyzed azido-alkyne click reaction, which is widely used for the synthesis of block copolymers
To prepare rod-coil block copolymers via the copper-catalyzed click reaction, first, the homopolymer with appropriate functional groups were synthesized in accordance with previous reports [31]
Summary
Several organic semiconducting materials have been studied due to their potential beneficial properties, such as solution processability [1,2], band gap tuning [3,4,5], chemical structure, and self-assembly [6,7]. Our lab developed a series of block copolymers, such as: poly(3-hexylthiophene)-block-poly(n-butyl acrylate) (P3HT-b-PBA) and polyfluorene-block-poly(pendent isoindigo) (PF-b-Piso) for stretchable field-effect transistor and resistive memory applications [25,26] In both of the cited studies, the materials were designed and synthesized through the copper-catalyzed azido-alkyne click reaction, which is widely used for the synthesis of block copolymers. Composite CsPbX3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) were encapsulated with stretchable [poly(styrene-butadiene-styrene); SBS] fibers by electrospinning on light down-converters This was maintained for longer than 1 h in water and the material was stretched under 170% strain without obvious cracks showing; the LED chip device still maintained high luminance and performance under low voltage [38]. Encouraged by previous reports, in this paper we report on stretchable and blue light-emitter rod-coil di-block copolymers (PF-b-PBA) blended with perovskite (CsPbBr3 ) to make nanofiber membranes through electrospinning on light down-converters. This work represents an authoritative stride in the field of perovskite electronics by opening new possibilities for white-light-emitting down-converter devices
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