Ultrafast Nanophotonics for Applied Optical Materials – JC group

The interactions between light and materials make the world bright and colorful. Smart ways of utilizing the interactions have a broad application scope in the modern technology such as light harvesting, photocatalytic, and bioimaging applications.

The ultrafast nanophotonics group is devoted to study both the fundamental and applied aspects of the interactions between light and materials. In particular, we explore functions and underlying photophysics and photochemistry of fluorescent molecular materials and semiconductor nanomaterials with a special attention to their applications. We use time-resolved photonics characterization techniques and bottom-up nanofabrication methods.


Currently, we focus on three research areas:

(1) Full organic molecular-based fluorescent nanoparticles.

Here, we are using a novel molecular self-assembly approach (Small-Molecule Ionic Isolation Lattices, SMILES) to develop full-organic fluorescent nanoparticles. Based on this approach we have developed the brightest molecular-based fluorescent nanoparticles. At the moment, we are developing SMILES nanoparticles with fluorescence color from visible to near infrared and lifetime ranging from nanosecond to microsecond. These SMILES nanoparticles have a broad application aspect, such as tumor imaging. In this research topic, we are collaborating with the group of Prof. Bo W. Laursen.

(2) Develop multiplex bioimaging method.

Imaging multiple different types of biomolecules simultaneously in biological samples is the key to understand their function and correlation. Here, we are combining the “normal” color channels with fluorescence lifetime channels to develop multiplex imaging method.

(3) Ultrafast dynamics in metal-halide perovskite nanomaterials.

Metal-halide perovskite nanomaterials show a wide application scope, ranging from photovoltaic to light-emitting diodes, photodetection and photocatalysis. Here we are studying the fundamental photophysical processes (e.g. charge carrier dynamics) in metal-halide perovskite nanomaterials by combining ultrafast spectroscopies with theoretical modeling.



Full publication list: https://scholar.google.se/citations?user=nek1D6IAAAAJ&hl=en

Selected publications:

[1]         Junsheng Chen, Wei Zhang, Tönu Pullerits, “Two-photon absorption in halide perovskites and their applications”, Materials Horizons, 2022, DOI: 10.1039/D1MH02074A.

[2]         Junsheng Chen, Stine G. Stenspil, Spyridon Kaziannis, Laura Kacenauskaite, Nils Lenngren, Miroslav Kloz, Amar H. Flood, Bo W. Laursen, “Quantitative Energy Transfer in Organic Nanoparticles Based on Small-Molecule Ionic Isolation Lattices for UV Light Harvesting”, ACS Appl. Nano Mater. 2022, DOI: 10.1021/acsanm.2c01899.

[3]         Zhangben Dai, Junsheng Chen, Bin Yang, “Yb2+-Alloyed Cs4PbI6–CsPbI3 Perovskite Nanocomposites for Efficient and Stable Pure-Red Emission”, J. Phys. Chem. Lett., 2021, 12, 10093-10098. DOI: 10.1021/acs.jpclett.1c02798.

[4]         Hang Yin, Junsheng Chen, Peng Guan, Daoyuan Zheng, Qingkun Kong, Songqiu Yang, Panwang zhou, Bin Yang, Tönu Pullerits, and Keli Han “Controlling Photoluminescence and Photocatalysis Activities in Lead-Free Cs2PtxSn1-xCl6 Perovskites via Ion Substitution”, Angew. Chem. Int. Ed. Engl., 2021, 42, 22693-22699. DOI: 10.1002/anie.202108133.

[5]         Junsheng Chen; S. M. Ali Fateminia; Laura Kacenauskaite; Nicolai Bærentsen; Stine Grønfeldt Stenspil; Jona Bredehoeft; Karen L. Martinez; Amar H. Flood; Bo Wegge Laursen, “Ultrabright Fluorescent Organic Nanoparticles Based on Small‐Molecule Ionic Isolation Lattices” Angew. Chem. Int. Ed. Engl., 2021, 17, 9536-9544. (First author) DOI: 10.1002/anie.202100950.

[6]         Tianxin Bai, Bin Yang, Junsheng Chen, Daoyuan Zheng, Zhe Tang, Xiaochen Wang, Yang Zhao, Ruifeng Lu, Keli Han, “Efficient Luminescent Halide Quadruple‐Perovskite Nanocrystals via Trap‐Engineering for Highly Sensitive Photodetectors”, Adv. Mater., 2021, 8, 2007215. DOI: 10.1002/adma.202007215.

[7]         Junsheng Chen, Maria E Messing, Kaibo Zheng and Tõnu Pullerits, “Cation Dependent Hot Carrier Cooling in Halide Perovskite Nanocrystals”, J. Am. Chem. Soc. 2019, 141, 3532-3540. (First author) DOI: 10.1021/jacs.8b11867.

[8]         Bin Yang, Junsheng Chen, Feng Hong, Xin Mao, Kaibo Zheng, Songqiu Yang, Yajuan Li, Tõnu Pullerits, Weiqiao Deng, Keli Han, “Lead‐Free, Air‐Stable All‐Inorganic Cesium Bismuth Halide Perovskite Nanocrystals”, Angew. Chem. Int. Ed. Engl., 2017, 41, 12471–12475. DOI: 10.1002/anie.201704739.

[9]         Junsheng Chen; Dongzhou Liu; Mohammed J. Al-Marri; Lauri Nuuttila; Heli Lehtivuori; Kaibo Zheng, “Photo-stability of CsPbBr3 perovskite quantum dots for optoelectronic application”. Sci. China Mater., 2016, 59, 719-727. DOI: 10.1007/s40843-016-5123-1.

[10]       Junsheng Chen; GuangJiu Zhao; Timothy R. Cook; Ke-Li Han; Peter J. Stang; “Photophysical properties of self-assembled multinuclear platinum metallacycles with different conformational geometries”, J. Am. Chem. Soc. 2013, 135, 6694–6702. DOI: 10.1021/ja402421w.



Junsheng ChenJunsheng Chen (C.V.)

Assistant Professor

Email: junsheng.chen@chem.ku.dk



We are looking for highly motivated Postdoctoral researcher, PhD, MSc and Bachelor students. Contact Junsheng for further information.



Ultrafast Nanophotonics for Applied Optical Materials – JC group

Nano-Science Center, Department of Chemistry, Universitetsparken 5, DK-2100 Copenhagen Ø

Junsheng Chen (C.V.)

Assistant Professor

Office: CS19
E-mail: junsheng.chen[AT]chem.ku.dk