Enhancing Stability and Emissions in Metal Halide Perovskite Nanocrystals Through Mn<sup>2</sup>⁺ Doping
Metal halide perovskite (MHP) nanocrystals (NCs) offer great potential for high-efficiency optoelectronic devices; however, they suffer from structural softness and chemical instability. Doping MHP NCs can overcome this issue. In this work, we synthesize Mn-doped methylammonium lead bromide (MAPbBr&...
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2025-06-01
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| author | Thi Thu Trinh Phan Thi Thuy Kieu Nguyen Trung Kien Mac Minh Tuan Trinh |
| author_facet | Thi Thu Trinh Phan Thi Thuy Kieu Nguyen Trung Kien Mac Minh Tuan Trinh |
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| description | Metal halide perovskite (MHP) nanocrystals (NCs) offer great potential for high-efficiency optoelectronic devices; however, they suffer from structural softness and chemical instability. Doping MHP NCs can overcome this issue. In this work, we synthesize Mn-doped methylammonium lead bromide (MAPbBr<sub>3</sub>) NCs using the ligand-assisted reprecipitation method and investigate their structural and optical stability. X-ray diffraction confirms Mn<sup>2</sup>⁺ substitution at Pb<sup>2</sup>⁺ sites and lattice contraction. Photoluminescence (PL) measurements show a blue shift, significant PL quantum yield enhancement, reaching 72% at 17% Mn<sup>2</sup>⁺ doping, and a 34% increase compared to undoped samples, attributed to effective defect passivation and reduced non-radiative recombination, supported by time-resolved PL data. Mn<sup>2</sup>⁺ doping also improves long-term stability under ambient conditions. Low-temperature PL reveals the crystal-phase transitions of perovskite NCs and Mn-doped NCs to be somewhat different than those of pure MAPbBr<sub>3</sub>. Mn<sup>2</sup>⁺ incorporation into perovskite promotes self-assembly into superlattices with larger crystal sizes, better structural order, and stronger inter-NC coupling. These results demonstrate that Mn<sup>2</sup>⁺ doping enhances both optical performance and structural robustness, advancing the potential of MAPbBr<sub>3</sub> NCs for stable optoelectronic applications. |
| format | Article |
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| institution | DOAJ |
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| spelling | doaj-art-4d5f2716fb874d5ca5668e4aaf0ea8622025-08-20T03:11:32ZengMDPI AGNanomaterials2079-49912025-06-01151184710.3390/nano15110847Enhancing Stability and Emissions in Metal Halide Perovskite Nanocrystals Through Mn<sup>2</sup>⁺ DopingThi Thu Trinh Phan0Thi Thuy Kieu Nguyen1Trung Kien Mac2Minh Tuan Trinh3Chemistry and Biochemistry Department, Utah State University, 300 Old Main Hill, Logan, UT 84322, USAChemistry and Biochemistry Department, Utah State University, 300 Old Main Hill, Logan, UT 84322, USAPhysics Department, Utah State University, 300 Old Main Hill, Logan, UT 84322, USAChemistry and Biochemistry Department, Utah State University, 300 Old Main Hill, Logan, UT 84322, USAMetal halide perovskite (MHP) nanocrystals (NCs) offer great potential for high-efficiency optoelectronic devices; however, they suffer from structural softness and chemical instability. Doping MHP NCs can overcome this issue. In this work, we synthesize Mn-doped methylammonium lead bromide (MAPbBr<sub>3</sub>) NCs using the ligand-assisted reprecipitation method and investigate their structural and optical stability. X-ray diffraction confirms Mn<sup>2</sup>⁺ substitution at Pb<sup>2</sup>⁺ sites and lattice contraction. Photoluminescence (PL) measurements show a blue shift, significant PL quantum yield enhancement, reaching 72% at 17% Mn<sup>2</sup>⁺ doping, and a 34% increase compared to undoped samples, attributed to effective defect passivation and reduced non-radiative recombination, supported by time-resolved PL data. Mn<sup>2</sup>⁺ doping also improves long-term stability under ambient conditions. Low-temperature PL reveals the crystal-phase transitions of perovskite NCs and Mn-doped NCs to be somewhat different than those of pure MAPbBr<sub>3</sub>. Mn<sup>2</sup>⁺ incorporation into perovskite promotes self-assembly into superlattices with larger crystal sizes, better structural order, and stronger inter-NC coupling. These results demonstrate that Mn<sup>2</sup>⁺ doping enhances both optical performance and structural robustness, advancing the potential of MAPbBr<sub>3</sub> NCs for stable optoelectronic applications.https://www.mdpi.com/2079-4991/15/11/847metal halide perovskite nanocrystalsquantum dotsMn-doped methylammonium lead bromidecrystal phase transitionPLQY enhancementperovskite stability |
| spellingShingle | Thi Thu Trinh Phan Thi Thuy Kieu Nguyen Trung Kien Mac Minh Tuan Trinh Enhancing Stability and Emissions in Metal Halide Perovskite Nanocrystals Through Mn<sup>2</sup>⁺ Doping Nanomaterials metal halide perovskite nanocrystals quantum dots Mn-doped methylammonium lead bromide crystal phase transition PLQY enhancement perovskite stability |
| title | Enhancing Stability and Emissions in Metal Halide Perovskite Nanocrystals Through Mn<sup>2</sup>⁺ Doping |
| title_full | Enhancing Stability and Emissions in Metal Halide Perovskite Nanocrystals Through Mn<sup>2</sup>⁺ Doping |
| title_fullStr | Enhancing Stability and Emissions in Metal Halide Perovskite Nanocrystals Through Mn<sup>2</sup>⁺ Doping |
| title_full_unstemmed | Enhancing Stability and Emissions in Metal Halide Perovskite Nanocrystals Through Mn<sup>2</sup>⁺ Doping |
| title_short | Enhancing Stability and Emissions in Metal Halide Perovskite Nanocrystals Through Mn<sup>2</sup>⁺ Doping |
| title_sort | enhancing stability and emissions in metal halide perovskite nanocrystals through mn sup 2 sup ⁺ doping |
| topic | metal halide perovskite nanocrystals quantum dots Mn-doped methylammonium lead bromide crystal phase transition PLQY enhancement perovskite stability |
| url | https://www.mdpi.com/2079-4991/15/11/847 |
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