Materials such as hybrid organic-inorganic perovskites, self-assembled molecular crystals, and conjugated polymers can demonstrate anomalously long excitonic diffusion. We seek to characterize and optimize these materials through an iterative combination of synthesis and spectroscopy. In the laboratory, we probe the initial femtosecond dynamics after excitation and follow the fate of the carriers and excitons through the nanosecond (or hundreds of nanosecond) timescale.
B.C. Li*, K. Lin*, P.-J. Wu, A. Gupta, K. Peng, S. Sohoni, J.C. Ondry, Z. Zhou, C.C. Bellora, Y.J. Ryu, S. Chariton, D.J. Gosztola, V.B. Prakapenka, R.D. Schaller, D.V. Talapin, E. Rabani and G.S. Engel "Exciton-phonon Coupling and Phonon-assisted Exciton Relaxation Dynamics in In1-xGaxP Quantum Dots", Nature Communications 16 , 4424 2025
B.C. Li, H. Cairney, Y. Jin, J. Park, S. Sohoni, L.T. Lloyd, Y. Liu, J.E. Jureller, Y.J. Ryu, S. Chariton, V.B. Prakapenka, R.D. Schaller, G. Galli and G.S. Engel "Connectivity-dependent Exciton-phonon Coupling in Cesium Bismuth Halide Quantum Dots", ACS Nano 19 , 10359–10368 2025
E.M. Janke*, N.E. Williams*, C. She, D. Zherebetskyy, M. Hudson, L. Wang, D.J. Gosztola, R.D. Schaller, B. Lee, C. Sun, G.S. Engel and D.V. Talapin "The origin of broad emission spectra in InP quantum dots: contributions from structural and electronic disorder", JACS 140 , 15791–15803 2018
L. Wang, N.P. Brawand, M. Vörös, P.D. Dahlberg, J.P. Otto, N.E. Williams, D.M. Tiede, G. Galli and G.S. Engel "Excitations Partition into Two Distinct Populations in Bulk Perovskites", Adv. Opt. Mat. , 1700975 2018
L. Wang, N.E. Williams, E.W. Malachosky, J.P. Otto, D. Hayes, R.E. Wood, P. Guyot-Sionnest and G.S. Engel "Scalable Ligand-Mediated Transport Synthesis of Organic-Inorganic Hybrid Perovskite Nanocrystals with Resolved Electronic Structure and Ultrafast Dynamics", ACS Nano 11 , 2689–2696 2017
