Synthesis, Light Emission, and Lasing in Organic Semiconductor-Incorporated Perovskite (OSiP)

 

Synthesis, Light Emission, and Lasing in Organic Semiconductor-Incorporated Perovskite (OSiP)

 

Date: 14^th May, 2025 (Wednesday)

Time: 5 - 6 pm (HKT)

 

Venue: Lecture Theatre P1, Chong Yuet Ming Chemistry Building

 

Prof. Letian DOU

 

Davidson School of Chemical Engineering and Department of Chemistry
Purdue University

 

Prof. Letian Dou is currently the Charles Davidson Associate Professor of Chemical Engineering and Chemistry (by courtesy) at Purdue University. From July 2025, he will be Paul & Phyllis Fireman Professor of Chemistry at Emory University. He obtained his B.S. in Chemistry from Peking University in 2009 and Ph.D in Materials Science and Engineering from UCLA in 2014. From 2014 to 2017, he was a postdoctoral fellow at University of California-Berkeley and Lawrence Berkeley National Laboratory. His research interest includes the design and synthesis of organic-inorganic hybrid materials and low-dimensional materials, fundamental understanding of the structure-property relationships, as well as applications in high performance electronic and optoelectronic devices. He is a recipient of ACS Photonics Young Investigator Lectureship award (2025), AIChE Nanoscale Sci. & Engr. Forum Young Investigator Award (2024), Humboldt Research Fellowship (2024), Waterloo Institute for Nanotechnology (WIN) Rising Star Award (2022), AIChE Owens Corning Early Career Award (2022), NSF CAREER Award (2021), Advanced Materials Rising Stars Award (2021), Office of Naval Research Young Investigator Award (2019), Highly Cited Researcher in Cross-Fields (2019-present), MIT Technology Review Innovators Under 35-China Award (2018), among others.

 

Halide perovskites are exciting new semiconductors that show a great promise in low cost and high-performance optoelectronics devices. However, the poor stability is limiting their practical use. In this talk, I will present a molecular approach to the synthesis of a new family of hybrid material – Organic Semiconductor-incorporated Perovskite (OSiP), which are more versatile and intrinsically stable. Energy transfer and charge transfer between adjacent organic and inorganic layers are extremely fast and efficient, owing to the atomically flat interface and short interlayer distance. In addition, the rigid conjugated ligand design dramatically enhances their chemical stability, suppresses solid-state ion diffusion, and modulates electron-phonon coupling, making them useful in many applications, particularly in solid-state lighting. Using these stable hybrid materials, we demonstrate efficient light emission and amplification in single crystalline nanostructures, epitaxial heterostructures, and polycrystalline thin films.