High-sensitivity and high-output voltage lead-free perovskite-based fiber optoelectronic devices

Lead-free halide perovskites have excellent optoelectronic properties and have been widely studied in the optoelectronic field. A kind of all-inorganic double perovskite crystals (PCs) with high output voltage and high sensitivity was successfully synthesized via a more energy-efficient crystallization method in this study. The luminescence intensity of the perovskite crystals was significantly enhanced by Bi 3+ doping. These perovskite crystals were used to prepare red light-emitting diodes (LEDs) with color purity of up to 93.1 %. In addition, the perovskite crystals were used to modify aramid chopped fibers (ACFs)/polyphenylene sulfide (PPS) composite fibers to fabricate flexible luminescent fibers. The modified composite fibers also demonstrated exceptional piezoelectric properties. Therefore, the modified composite fiber was used to prepare a piezoelectric sensor. The maximum output voltage of the sensor could reach 50 V at room temperature with a response time of only 8 ms. The piezoelectric constant d 33 of this piezoelectric sensor was 374 pC/N, indicating that the sensor had high sensitivity. When the temperature increased to 373 K, the output voltage gradually rose to 100 V. The red and white LED devices demonstrated the potential of perovskites for lighting and display applications. Meanwhile, the flexible light-emitting fibers and piezoelectric sensors further expanded the application scope of perovskite in multifunctional optoelectronic devices.