In the dynamic world of materials science, a groundbreaking discovery by Feier Fang and his team at the International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics at Shenzhen University has opened new avenues for enhancing the efficiency of light-emitting materials. The research, published in ‘Small Science’, focuses on 0D perovskites, a class of materials that have been gaining traction for their potential in solar cells and light-emitting applications. The study reveals a strong correlation between the order of A-site cations and the emission characteristics of self-trapped excitons (STEs) in these materials.
The team synthesized a lead-free compound, Sb3+‐doped ((C2H5)2NH2)3InCl6 single crystal, which exhibits a high photoluminescence quantum yield. This compound undergoes a fascinating transformation with increasing temperature: the A-site organic cations transition from an ordered configuration to a disordered one, leading to a redshift in the STE emission. This phenomenon is not just a scientific curiosity; it has significant implications for practical applications.
“By understanding and controlling the order-disorder transitions of A-site cations, we can fine-tune the optical properties of 0D perovskites,” explains Fang. “This could lead to more efficient and versatile light-emitting materials, which are crucial for advancing technologies in the energy sector.”
The research also delves into the underlying mechanisms behind this temperature-induced redshift. Hirshfeld surface calculations show that high temperatures enhance the thermal vibrations of SbCl63− clusters and the octahedra distortion, which are directly responsible for the observed redshift. This thermally triggered transition is reversible, making it a promising candidate for temperature-sensing applications.
The implications of this research are far-reaching. The ability to modulate STE emission through A-site cation order could revolutionize the design of efficient light emitters. This could lead to more efficient solar cells, better lighting solutions, and even advanced temperature-sensing technologies. As the energy sector continues to evolve, materials like these could play a pivotal role in developing sustainable and efficient energy solutions.
The findings published in ‘Small Science’ (translated to English as ‘Small Science’) not only provide valuable insights into the role of A-site cations in modulating STE emission but also pave the way for future developments in the field. As researchers continue to explore the potential of 0D perovskites, the work by Fang and his team serves as a beacon, guiding the path towards more efficient and innovative materials for the energy sector.
