Improving the Stability of α-CsPbI 3 Nanocrystals in Extreme Conditions Facilitated by Mn 2+ Doping.

The wide application of CsPbI ₃ nanocrystals (NCs) is limited due to their poor phase stability. We reported that Mn ²⁺ -CsPbI ₃ NCs have better optical performance and phase stability. With a suitable Mn/Pb ratio (5.0%), Mn ²⁺ -doped α-CsPbI ₃ NCs exhibited the best stability under UV irradiation, ethanol addition, and heating. Under UV irradiation and addition of ethanol, photoluminescence (PL) intensities of CsPbI ₃ NCs could be only preserved up to 35% (22 min UV irradiation) and 10% (ethanol addition), respectively, whereas, Mn ²⁺ -doped CsPbI ₃ (5.0%) exhibited much improved stability, and their intensities could be preserved up to 70% (22 min UV) and 58% (ethanol), respectively. It should be noted that crystal-phase stability could be maintained at least 7 h even at 120 °C. We believe that the improved stability in extreme conditions for α-CsPbI ₃ NCs can be further applied to optoelectronic devices.
Competing Interests: The authors declare no competing financial interest.
(© 2021 The Authors. Published by American Chemical Society.)