Teng Qian, Tan Qinghua, Hou Mengyue, Zhang Jiajia, Yuan Fanglong
Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China.
Anhui Provincial Key Laboratory of Green Carbon Chemistry, School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang 236037, China.
Sci Adv. 2025 Jul 18;11(29):eadw5454. doi: 10.1126/sciadv.adw5454. Epub 2025 Jul 16.
Lead-free tin perovskites present remarkable environmental advantages over lead-based counterparts. While substantial progress has been made with three-dimensional (3D) and 2D tin perovskite LEDs (PeLEDs), the potential of 0D tin perovskites-renowned for their exceptional optical properties and enhanced stability-remains largely unexplored for PeLEDs due to challenges in charge transport and injection. In this study, we introduce a binary host-guest strategy that overcomes these challenges, enabling the demonstration of bright and efficient 0D tin PeLEDs with orange and white light emission. By incorporating 0D tin bromide hybrid (HDAD)SnBr into a meticulously designed binary host system, we achieved PeLEDs with a maximum brightness exceeding 7500 candela meters and an external quantum efficiency surpassing 7%. The remarkable device performance is primarily attributed to improved film morphology, enhanced charge carrier mobility, and optimized carrier balance. Furthermore, by tailoring the device structure, we realized white LEDs with a maximum luminance of 1800 candela meters.
无铅锡基钙钛矿相对于铅基钙钛矿具有显著的环境优势。虽然三维（3D）和二维锡基钙钛矿发光二极管（PeLEDs）已取得了实质性进展，但由于电荷传输和注入方面的挑战，以其卓越光学性能和增强稳定性而闻名的零维锡基钙钛矿在PeLEDs中的潜力在很大程度上仍未得到探索。在本研究中，我们引入了一种二元主客体策略来克服这些挑战，从而实现了具有橙色和白色发光的明亮且高效的零维锡基PeLEDs。通过将零维溴化锡杂化物（HDAD）SnBr纳入精心设计的二元主体系统，我们实现了最大亮度超过7500坎德拉每平方米且外量子效率超过7%的PeLEDs。卓越的器件性能主要归因于改善的薄膜形态、增强的电荷载流子迁移率以及优化的载流子平衡。此外，通过调整器件结构，我们实现了最大亮度为1800坎德拉每平方米的白色发光二极管。
