High-Contrast Thermochromism in Room-Temperature Transparent Layered Perovskite PEA 2 PbBr 4 with a High Temperature-Induced Bandgap Change Rate of 0.8 meV/K

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Two-dimensional organic–inorganic hybrid layered perovskites have emerged as a new generation of optoelectronic materials. However, the thermochromism in organic–inorganic hybrid layered perovskites has been rarely explored in depth. A further understanding of the mechanism is necessary and favorable for the application. Here, transparent centimeter-sized single crystals of the organic–inorganic hybrid layered perovskite (C 6 H 5 C 2 H 4 NH 3 ) 2 PbBr 4 (PEA 2 PbBr 4 ) were synthesized using an improved evaporation method. As a typical organic–inorganic hybrid layered perovskite, the PEA 2 PbBr 4 single crystal shows high-contrast and progressive thermochromism exhibiting a change from colorlessness and transparency to lemon yellow in a wide temperature range of 200–450 K. Based on the calculation through the Varshni equation, the temperature-induced bandgap change rate directly associated with the high-contrast thermochromism of PEA 2 PbBr 4 reaching 0.8 meV/K. This value is higher than that of many three-dimensional perovskites and traditional IV–III semiconductors. Furthermore, the temperature-dependent 193 nm photoluminescence spectra suggest that this high temperature-induced bandgap change rate of PEA 2 PbBr 4 is a result of the competitive interaction between lattice thermal expansion and electron–phonon coupling (Fröhlich coupling coefficient Γ LO = 2.215). Based on the characteristics introduced above, PEA 2 PbBr 4 as an organic–inorganic hybrid layered perovskite has a better performance in achieving the balance between high-contrast and high room-temperature transmittance. Therefore, PEA 2 PbBr 4 is a material with great potential in applications like temperature-indicating labels. This work provides valuable insights into the thermochromism of layered perovskites, offering a new material system and approach for developing thermochromic materials with higher sensitivity and efficiency.

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