Proceedings of Online seminar on properties of perovskite solar cells (CPPSC20)
Publication date: 12th March 2020
Perovskite nanocrystals present outstanding optoelectronic properties, making them suitable for optoelectronic applications, lasers and sensors. Among them, a high photoluminescence quantum yield (PLQY) and a narrow emission bandwidth. In addition, their band-gap can be easily tuned, which can be achieved varying the chemical composition of the nanocrystals or even their morphologies. [1] Highly emissive perovskite nanoparticles have been synthesized covering the entire visible range. Nevertheless, for the blue region, where CsPbCl3 perovskite nanoparticles emit, achieving high PLQY is still a challenge. These perovskite nanocrystals have relatively low photoluminescence. It has been reported a PLQY of 70% for CsPbBr3 nanoplatelets and 88% in film, obtained with a mixture of different perovskites. [2,3]
In this work, a blue-emissive gel is formed by the combination of an organic gelator and CsPbBr3 nanoparticles (around 8nm). The gel presents a PLQY of 70%, while the colloidal solution of the nanoparticles has a PLQY of 75%. A great stability is also shown, after 4 months in ambient conditions, the PLQY decreased less than 10%. However, this interesting feature depends on the organic gelator employed. Different emissions are obtained when the gelator structure is modified.
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