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Siegen Ph.D. student made the Cover Story in a scientific journal


In a recent article in the scientific journal Molecules, physical chemists at the University of Siegen in the research groups of Profs. Lenzer and Oum reported a copper(I)-based compound that could be a promising candidate in the class of blue-emitting materials with high photoluminescence quantum yield and excellent color purity for lighting and display applications. In particular, this paper was selected from ca. 250 articles as the Cover Story of the recent issue of the journal.

Domenic Gust, the first author of the article and the winner of a Ph.D. scholarship from the Fonds der Chemischen Industrie (FCI) in the year 2023, synthesized the organic-inorganic hybrid copper(I) compound bis(tetraethylammonium) di-µ-bromo-dibromodicuprate(I), [N(C2H5)4]2[Cu2Br4], and used it to prepare thin films on a quartz substrate. Under UV irradiation, the thin film emits intense blue light at 467 nanometers. The blue emission lasts long enough with a photoluminescence lifetime of about 57 microseconds. “What is very interesting to me as a chemist in the lab is that we can control the emission properties of the Cu(I)-based anions in these compounds by varying the size and electronic structure of the organic countercation,” says Mr. Gust.


In this article, the authors mention that the emission mechanism of these halocuprates(I) is in general not yet well understood. Using transient absorption and emission spectroscopy, they successfully demonstrated that the emission is due to phosphorescence of a long-lived (57 microseconds) triplet state formed from the initially excited short-lived singlet state with a time constant of 184 picoseconds. The detailed discussion on the emission mechanism can be found in the article (see link below).

[1] D. Gust, M. Scholz, K. Oum and T. Lenzer, “Excited-State Dynamics of Bis(tetraethylammonium) di-µ-bromo-dibromodicuprate(I) Thin Films”, Molecules, Cover Story, 28, 7841 (2023).

Cover Story:

Cover Image:

Prof. Dr. Kawon Oum (oum@chemie.uni-siegen.de)
Prof. Dr. Thomas Lenzer (lenzer@chemie.uni-siegen.de)

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