Tunable Broadband Emission via Self‐Trapped Excitons and Mn <sup>2+</sup> Energy Transfer in a 0D Hybrid Manganese Bromide
A novel 0D organic-inorganic hybrid manganese bromide, (TMBM)<sub>2</sub>MnBr<sub>4</sub>, based on bromomethyltrimethylammonium (TMBM) cations and isolated [MnBr<sub>4</sub>]<sup>2</sup>⁻ tetrahedra, is synthesized and structurally characterized. The material undergoes two temperature-induced phase transitions and exhibits intense broadband green photoluminescence at low temperatures. Detailed structural, spectroscopic, and thermodynamic analyses reveal that the emission behavior is governed by the interplay between exciton dynamics and cation ordering. The competition between self-trapped exciton (STE) formation and energy transfer to Mn<sup>2</sup>⁺ centers enables tunable emission, while variations in Mn─Br bond lengths across crystallographically distinct tetrahedra modulate crystal field strength and emission energy. These insights into structure-property relationships in low-dimensional manganese halides offer promising avenues for the design of efficient, tunable luminescent materials and multifunctional magneto-optical devices.
Authors
- Adam Pikul (ORCID: https://orcid.org/0000-0002-5998-0707)
- Michał Baranowski (ORCID: https://orcid.org/0000-0002-5974-0850)
- Alessandro Surrente (ORCID: https://orcid.org/0000-0003-4078-4965)
- Adam Sieradzki (ORCID: https://orcid.org/0000-0003-4136-5754)
- Daria Szewczyk (ORCID: https://orcid.org/0000-0001-7923-1239)
- Paulina Peksa (ORCID: https://orcid.org/0000-0002-1483-4407)
- Paulina Płochocka (ORCID: https://orcid.org/0000-0002-4019-6138)
- Dawid Drozdowski (ORCID: https://orcid.org/0000-0001-5918-5503)
- Mateusz Dyksik (ORCID: https://orcid.org/0000-0003-4945-8795)
- Maciej Ptak (ORCID: https://orcid.org/0000-0002-4639-2367)
- Anna Gągor (ORCID: https://orcid.org/0000-0002-8651-2925)
- Agnieszka Kuc (ORCID: https://orcid.org/0000-0002-9458-4136)
- Julia Osmólska
Institutions
- Wrocław University of Science and Technology (PL)
- University of Cambridge (GB)
- Helmholtz-Zentrum Dresden-Rossendorf (DE)
- Laboratoire National des Champs Magnétiques Intenses (FR)
- Center for Advanced Systems Understanding (DE)
- AGH University of Krakow (PL)
- Polish Academy of Sciences (PL)
Publication Details
- Journal
- Small
- Published
- 2025-07-26
- DOI
- https://doi.org/10.1002/smll.202504786
- Citations
- 1
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.73
Funders
- Narodowym Centrum Nauki