Blue-shifted aggregation-induced emission enhancement (AIE) from fluorinated Sn hydroxyquinoline derivative complexes for organic light-emitting diode applications
Presented by: Kathleen Ngo
Blue-shifted aggregation-induced emission enhancement (AIE) from fluorinated Sn hydroxyquinoline derivative complexes for organic light-emitting diode applications
Kathleen Ngo1, Wooseok Ki Ph.D1*, Boris Averkiev Ph.D.2, Phalguni Ghosh Ph. D.3, Juan A. Santana Ph.D.4, Gordan Reeves Ph.D.1, Barry Pemberton Ph.D.1, Kun Zhu5, Jing Li Ph.D.5
1School of Natural Sciences and Mathematics, Stockton University, Galloway, NJ
2Department of Chemistry, Kansas State University, Manhattan, KS
3Department of Natural Sciences, Middlesex County College, Edison, NJ
4Department of Chemistry, University of Puerto Rico at Cayey, Cayey, PR
5Department of Chemistry and Chemical Biology, Rutgers University, Piscataway NJ
Kathleen Ngo
Dr. Wooseok Ki (faculty mentor)
Hi, I'm Kathleen, and welcome to my research page for the 2021 NAMS Symposium! I'm excited that you're checking out my work. My project is a synthesis and characterization project, focusing on Sn metal complexes with applications in organic light-emitting diodes (OLEDs). Through this, we discovered a unique halide exchange reaction to exchange Cl with F at our Sn metal center. Stronger sigma bonding between Sn and F gives rise to many advantageous properties including higher quantum yields, thermal stability, and aggregation-induced emission properties.
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If you'd like to learn more, be sure to keep scrolling on this page and check out the abstract/poster presentation pages as well!
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For a different perspective, check out my work featured in Stockton News and NAMS e-zine!
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Introduction and Applications
The applications of this work are fabricating these emissive Sn complexes into OLED devices. The solid-state emissive metal complexes would comprise the emitting layer in a simple OLED device. Organic light-emitting diodes are most commonly used to power the screens on our devices, including phones, tablets, and laptops. OLEDs have a variety of advantageous properties compared to their LED or LCD counterparts. They are much more efficient, allow for wider viewing angles and better color contrast, and can be made into flexible devices. Check out some examples of OLED devices below!
Crystal Growth and X-ray Diffraction
A lot of my work revolves around synthesizing emissive metal complexes. A key feature for the success of this work is growing crystals to obtain molecular structures from single-crystal X-ray diffraction. Check out some cool images and videos below of my emissive complexes and their crystal structures.
Effect of Halide Exchange
A major discovery in our work has been a unique halide exchange from Cl to F at the Sn metal center through hexafluorophosphate degradation. This introduces desirable properties, such as more intense emission (higher quantum yields), higher thermal stability, and aggregation-induced emission properties. Stronger Sn-F sigma bonding is supported by X-ray crystallography data and cyclic voltammetry. Check out the visual below for the proposed reaction for the halide exchange and the effect this has on emission intensity (left is Snq2F2 and right is Snq2Cl2). Be sure to check out the poster session for more information about the enhanced properties of fluorinated Sn complexes.
