报告简介：

Recently, astounding optoelectronic properties have been discovered in a group of halide perovskite materials. They share a general ABX3 chemical formula, in which A is a cesium (Cs+) or an aliphatic ammonium (RNH3+) cation, B is a divalent Pb2+ or Sn2+ cation and X is an anion such as Cl-, Br- or I-. Their crystal structures resemble the one commonly found in conventional oxide based perovskite (BaTiO3). The halide perovskites can be processed like polymeric semiconductor materials using solution based processes; and can be coated into large area thin films on arbitrary substrates; they can also be crystallized into three-dimensional periodic structures and behavior like conventional inorganic semiconductors including the superior charge transportation properties.

In this talk, our recent work of developing perovskite/polymer composites towards the realization of fully printable light-emitting diodes (LEDs) will be presented. The perovskite/polymer composites possess all the remarkable optoelectronic characteristics of pure perovskites. For instance, we have demonstrated their use for blue, green and red LEDs.  In addition, the device efficiencies exceeded those of pure perovskite LEDs. The perovskite/polymer composites have shown advantages in improving the processability and quality of the perovskite thin films; and enhancing the structural stability of the perovskites especially at highly humid fabrication and service environments. By embedding the perovskite crystals inside a polymer matrix, the perovskites can be less toxic and more environmentally benign compared to pure perovskites. At the end of the talk, other potential applications of perovskite/polymer composites will be briefly discussed.
 

报告人：

余志滨博士从2014年至今，在佛罗里达州立大学工业工程和制造系任职助理教授。余博士2001年和2003年在清华大学化学工程系高分子专业分别获得本科和硕士学位，师从王晓工教授，致力于聚合物非线性光学材料的研究；在2010年从加州大学洛杉矶分校材料科学工程系获得博士学位，师从裴启兵教授，致力于聚合物发光二极管的研究；从2011年到2014年在加州大学伯克利分校从事博士后研究，师从 Ali Javey教授，致力于三五族半导体薄膜生长技术的开发。余博士当前主要研究兴趣包括composites for electronics and optics (CEO), additive thin-film manufacturing (ATM)和介于有机无机杂化材料的printed electronics。余博士在2016年获得美国空军部Airforce Office of Scientific Research (AFOSR) Young Investigator Award，同时主持两项美国自然科学基金资助课题。

Department of Industrial and Manufacturing Engineering
Florida State University, Tallahassee, FL, 32310

欢迎广大师生光临！