Room-Temperature Synthesis of Air-Stable Near-Infrared Emission in FAPbI₃ Nanoparticles Embedded in Silica

• Published in: Biosensors
• Main Authors: Lung-Chien Chen, Li-Wei Chao, Chen-Yu Xu, Chih-Hung Hsu, Yi-Ting Lee, Zi-Min Xu, Chun-Cheng Lin, Zong-Liang Tseng
• Format: Article
• Language: English
• Published: MDPI AG 2021-11-01
• Subjects: perovskite; nanocrystals; APTES; CH(NH₂)₂PbI₃; FAPbI₃; NIR
• Online Access: https://www.mdpi.com/2079-6374/11/11/440
• ISSN: 2079-6374

Hybrid organic−inorganic and all-inorganic metal halide perovskite nanoparticles (PNPs) have shown their excellent characteristics for optoelectronic applications. We report an atmospheric process to embed formamidinium CH(NH₂)₂PbI₃ (FAPbI₃) PNPs in silica protective layer at room temperature (approximately 26 °C) employing (3-aminopropyl) triethoxysilane (APTES). The resulting perovskite nanocomposite (PNCs) achieved a high photoluminescence (PL) quantum yield of 58.0% and good stability under atmospheric moisture conditions. Moreover, the PNCs showed high PL intensity over 1 month of storage (approximately 26 °C) and more than 380 min of PNCs solutions in DI water. The studied near-infrared (NIR) light-emitting diode (LED) combined a NIR-emitting PNCs coating and a blue InGaN-based chip that exhibited a 788 nm electroluminescence spectrum of NIR-LEDs under 2.6 V. This may be a powerful tool to track of muscle and disabled patients in the detection of a blood vessel.