Abstract
Cesium lead halide perovskite quantum dots (QDs) have drawn extensive attention due to their excellent optical properties. However, their use is limited by poor stability. To enhance their stability, we electrospun perovskite-embedded fibers from composite CsPbX3 (X = Cl, Br, and I) perovskite QDs, blending with three polymers, poly(styrene-butadiene-styrene) (SBS), poly(methyl methacrylate) (PMMA), or polystyrene (PS), for the light-emitting diode (LED) applications. We found that the stretchable CsPbBr3@SBS fibers revealed the highest photoluminescence quantum yield, the CsPbBr3@PMMA fibers demonstrated a high thermal stability, and the CsPbBr3@PS fibers exhibited the best water-resistant stability. The photoluminescence intensity maintained 83% of its initial intensity for more than 3 months in water. Furthermore, the LED devices are manufactured from the blue chips and packaged with the core/shell red and green perovskite-based fibers by using biaxial electrospinning exhibited stable and highly efficient white luminescence. The luminance and efficiency are higher than 400% of the values of multilayered structures.
Highlights
The efficient photovoltaic cells based on organometal halide perovskites were demonstrated for the first time in 2009.1 Since the organic/inorganic hybrid lead halide perovskites have attracted extensive attention worldwide for optoelectronic device applications
We found that the stretchable CsPbBr3@SBS fibers revealed the highest photoluminescence quantum yield, the CsPbBr3@poly(methyl methacrylate) (PMMA) fibers demonstrated a high thermal stability, and the CsPbBr3@PS fibers exhibited the best water-resistant stability
The color can be tuned by changing the halide ratios in the perovskites, and the properties of the fibers are affected by the polymers
Summary
The efficient photovoltaic cells based on organometal halide perovskites were demonstrated for the first time in 2009.1 Since the organic/inorganic hybrid lead halide perovskites have attracted extensive attention worldwide for optoelectronic device applications. For the past several years, diverse fluorescent sensory applications based on conjugated polymer nanofibers have been successfully prepared by our group.18–21 Another important effect of ES fibers is the geometrical confinement to the implants embedded in the fibers, which can adjust the orientation, crystallinity, stability, and optoelectronic properties of the implants. The diameter and morphology of the fibers can be controlled by ES parameters.18–20 Functional materials such as metallic nanoparticles, conjugated polymers, perovskite, and QDs26 can be incorporated into ES fibers to prepare composite fibers for various device applications. Our group successfully used the fibrous mats packaging approach in bright perovskite LEDs. The correlated color temperatures (CCT) of white LEDs (WLEDs) can be controlled by adjusting the thickness of the nanofibers and the voltage. The approach reported provides a promising avenue to fabricate stable and highly efficient perovskite-based WLEDs
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