Publication date: 22nd July 2026
Photoluminescence (PL) of self-trapped excitons (STE) is often observed in two dimensional hybrid organic-inorganic perovskites. STE emission is characterized by a very large Stokes shift (200-800 meV) and quite large activation energy of ~50-120 meV. The near-band emission (NBE) may be dominated by free exciton emission or can be more complex and may consist of defect-bound excitons and excitons consisting of large polarons especially under hydrostatic pressure [1]. Due to the high softness of organic-inorganic halide perovskites, their properties are often studied by PL method under high hydrostatic pressure, but the effect of pressure on the activation energy of STE and NBE has not been intensively studied due to measurement challenges (i.e., PL measurements at different temperatures under isobaric conditions). We have recently performed such measurements for the Ruddlesden–Popper perovskite ACE2PbBr4 [2], and are currently performing them for other perovskites. In this work, we will present how the activation energy of STE depends on the hydrostatic pressure for ACE2PbBr4. By increasing the pressure to 2.6 GPa, the activation energy was observed to decrease from ~100 meV to ~25 meV. The dependence of NBE on pressure has been observed to be more complex and will also be discussed in this presentation. To explain the changes in the activation energy and spectral position of STE and NBE, we used a configuration diagram commonly used to explain STE and free exciton emission in organic-inorganic perovskites. This diagram showed that a blue shift of STE and a red shift of NBE lead to a decrease in the STE activation energy. Similar studies are being conducted for other organic-inorganic halide perovskites and will also be presented in this work.
R. K. and F. D. acknowledge for financial support from the National Science Centre in Poland through OPUS Grant No. 2025/57/B/ST3/03683.
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