Preparation, Characterization, and Unexpected Cathodoluminescence of Polycrystalline TlPbI 3
Year: 2026
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide A polycrystalline powder of orange-red TlPbI 3 was prepared from equimolar amounts of TlI and PbI 2 by solid-state synthesis in an evacuated silica ampule at 400 °C. This reaction was analyzed for the first time by differential scanning calorimetry: During the first temperature cycle, it was revealed that small amounts of precursors sublimate before the reaction mixture melts congruently and recrystallizes, forming the title compound. During the second temperature cycle, the melting point for the title compound was determined to be 345 °C. Rietveld refinement of room-temperature powder X-ray diffraction data shows that orthorhombic TlPbI 3 crystallizes in the space group Cmcm with the lattice parameters a = 462.16(4), b = 1487.12(15), and c = 1181.43(11) pm for Z = 4. Optical studies by UV-Vis diffuse reflectance spectroscopy result in an absorption edge at λ abs = 568 nm and an experimentally determined band gap at E g = 2.23 eV for polycrystalline TlPbI 3 . Temperature-dependent cathodoluminescence studies on the polycrystalline sample show a broad signal at lower temperatures, which is blue-shifted by roughly 180 nm compared with previous reports.
Source: Inorganic Chemistry
Authors: Maurice Conrad, Jonas Grill, Stephan Böhringer, Thomas Schleid, Michael Saliba
Institutions: University of Stuttgart, Forschungszentrum Jülich
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W7148454781