近日，香港城市大学的王锋&于欣格及其研究团队取得一项新进展。经过不懈努力，他们研制出用于用户交互显示的多色可拉伸钙钛矿电致发光器件。相关研究成果已于2024年6月4日在国际知名学术期刊《自然—光子学》上发表。
据悉，可穿戴显示器需要符合皮肤的机械变形能力，以及长期稳定性，多色发射和足够的亮度，以实现实际有用的应用。然而，赋予一个单一器件所有的功能仍然是一个挑战。
该研究团队提出了一种合理的材料设计策略和简单的器件制造工艺，专门用于制造皮肤贴合的钙钛矿基交流电致发光（PeACEL）器件。这些器件具有较窄的发射带宽(半宽，<37nm)，可连续调谐的发射波长(468-694nm)，高拉伸性(400%)和足够的亮度(>200cdm-2)。该方法利用一类新的钙钛矿硫化锌(PeZS)荧光粉，由涂有钙钛矿纳米颗粒的ZnS荧光粉组成，通过粒子内总能量转移进行电激发。
这一策略不仅实现了纯红色和绿色的高效发射，还将粉末ACEL器件的色域扩展了高达250%。此外，这项处理技术有助于将PeACEL显示器与可穿戴电子产品集成，从而实现动态交互式显示和视觉实时温度监测的应用。这些PeACEL显示器为柔性电子产品的发展开辟了新的道路，并展现出在开发高效人造皮肤、机器人和生物医学监测器件方面的潜力。
附：英文原文
Title: Multicolour stretchable perovskite electroluminescent devices for user-interactive displays
Author: Chun, Fengjun, Zhang, Binbin, Gao, Yuyu, Wei, Xiaohe, Zhang, Qiang, Zheng, Weilin, Zhou, Jingkun, Guo, Yang, Zhang, Xin, Xing, Zhifeng, Yu, Xinge, Wang, Feng
Issue&Volume: 2024-06-04
Abstract: Wearable displays require mechanical deformability to conform to the skin, as well as long-term stability, multicolour emission and sufficient brightness to enable practically useful applications. However, endowing a single device with all the features remains a challenge. Here we present a rational material design strategy and simple device-manufacturing process for skin-conformable perovskite-based alternating-current electroluminescent (PeACEL) devices. These devices exhibit a narrow emission bandwidth (full-width at half-maximum, <37nm), continuously tuneable emission wavelength (468–694nm), high stretchability (400%) and adequate luminance (>200cdm-2). The approach leverages a new class of perovskite zinc sulfide (PeZS) phosphors, consisting of ZnS phosphors coated with perovskite nanoparticles for electrical excitation via total intraparticle energy transfer. This strategy results in pure red and green emissions and expands the colour gamut of powder-based ACEL devices by 250%. Moreover, our processing technique facilitates the integration of PeACEL displays with wearable electronics, enabling applications in dynamic interactive displays and visual real-time temperature monitoring. These PeACEL displays offer new routes in flexible electronics and hold potential for the development of efficient artificial skins, robotics and biomedical monitoring devices.
DOI: 10.1038/s41566-024-01455-6
Source: https://www.nature.com/articles/s41566-024-01455-6