A new class of perovskite-based alternating-current electroluminescent (PeACEL) devices has been developed, offering high colour purity, brightness, flexibility, and stretchability. These devices utilize a novel phosphor material, perovskite zinc sulfide (PeZS), which consists of ZnS coated with perovskite nanoparticles for efficient electrical excitation through total intraparticle energy transfer. The PeACEL devices exhibit a narrow emission bandwidth (<37 nm), tunable emission wavelength (468–694 nm), high stretchability (400%), and sufficient luminance (>200 cd m⁻²). The devices enable full-colour displays with a 250% expanded colour gamut and can be integrated with wearable electronics for applications in dynamic interactive displays and real-time temperature monitoring. The PeACEL devices demonstrate excellent operational stability, with luminance retention above 88% after 60 days of operation and no shift in emission peak. The devices are also highly stretchable, with a maximum strain of 400%, and can be fabricated as ultrathin (95 µm) and flexible displays. The PeACEL devices have been demonstrated for user-interactive skin displays, where they can dynamically display patterns and colours in response to stimuli. Additionally, the devices have been integrated with tactile sensors for real-time health monitoring and soft robotics applications. The PeACEL devices offer a promising solution for flexible electronics, with potential applications in artificial skins, robotics, and biomedical monitoring.A new class of perovskite-based alternating-current electroluminescent (PeACEL) devices has been developed, offering high colour purity, brightness, flexibility, and stretchability. These devices utilize a novel phosphor material, perovskite zinc sulfide (PeZS), which consists of ZnS coated with perovskite nanoparticles for efficient electrical excitation through total intraparticle energy transfer. The PeACEL devices exhibit a narrow emission bandwidth (<37 nm), tunable emission wavelength (468–694 nm), high stretchability (400%), and sufficient luminance (>200 cd m⁻²). The devices enable full-colour displays with a 250% expanded colour gamut and can be integrated with wearable electronics for applications in dynamic interactive displays and real-time temperature monitoring. The PeACEL devices demonstrate excellent operational stability, with luminance retention above 88% after 60 days of operation and no shift in emission peak. The devices are also highly stretchable, with a maximum strain of 400%, and can be fabricated as ultrathin (95 µm) and flexible displays. The PeACEL devices have been demonstrated for user-interactive skin displays, where they can dynamically display patterns and colours in response to stimuli. Additionally, the devices have been integrated with tactile sensors for real-time health monitoring and soft robotics applications. The PeACEL devices offer a promising solution for flexible electronics, with potential applications in artificial skins, robotics, and biomedical monitoring.