The Role of Alkylammonium Bromides on the Surface Passivation of Stable Alcohol‐Dispersed CsPbX3 Nanocrystals and on the Stability Enhancement in Light‐Emitting Applications

• Published in: Advanced optical materials Vol. 12; no. 31
• Main Authors: Uribe‐Vegas, Pablo, Villanueva‐Antolí, Alexis, Segura, Camilo, Werlinger, Francisca, Aliaga, Karen R., Caprile, Renato, Trofymchuk, Oleksandra S., Flores, Mario E., Osorio‐Román, Igor O., Echeverría‐Arrondo, Carlos, Adhikari, Samrat Das, Selmi, Olfa, Seró, Iván Mora, Rodriguez‐Pereira, Jhonatan, Pradhan, Bapi, Paulus, Michael, Sternemann, Christian, Hofkens, Johan, Martinez, Javier, Masi, Sofia, Gualdrón‐Reyes, Andrés F.
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01-11-2024
• Subjects: Alcohol; alcohol‐stable nanocrystals; Bromides; color converters; Ligands; Light emitting diodes; light‐emtting diodes; Nanocrystals; Optoelectronic devices; Passivity; Perovskites; Quantum efficiency; Stability; steric hindrance; surface passivation
• ISSN: 2195-1071; 2195-1071
• DOI: 10.1002/adom.202401475

The ligand passivation is considered an attractive strategy to prepare high‐quality perovskite nanocrystals (PNCs) with improved photophysical features in polar media. However, the long‐term stabilization of PNCs in these environments is still challenging, being pivotal to understanding the protection mechanism given by prominent surface ligands and avoiding material deterioration in polar solvents. In this work, how the nature of diverse alkylammonium bromides used during surface passivation influences the photophysical properties and quality of CsPbX3 PNCs fully dispersed in alcohol environments, exhibiting stability up to 10 months are investigated. By adding didodecyldimethylammonium benzyldodecyldimethylammonium and tetrabutylammonium bromides (DDAB, BDAB, and TBAB, respectively), DDAB and BDAB promote a suitable and partial surface coverage are observed, respectively, suppressing defect sites in the nanocrystals. Conversely, TBAB shows poor surface protection, decreasing the PL features of PNCs. The presence of DDAB and BDAB favors the fabrication of color converters, and efficient light‐emitting diodes (LEDs) with external quantum efficiencies (EQE) of ≈23%. Interestingly, significant device stability with BDAB capping shows an LED half‐life of 20‐fold longer than for DDAB. This contribution offers a promising approach for preparing highly luminescent and stable alcohol‐dispersed PNCs, useful for fabricating efficient optoelectronic devices.
This work shows the capability of different alkylammonium bromides to perform surface passivation of CsPbBr3 perovskite nanocrystals (PNCs) dispersed in alcohol environments. Didodecyldimethylammonium  and benzyldodecyldimethylammonium bromide  ligands (DDAB and BDAB, respectively) provide high‐quality PNCs with the long‐term stability of up to 10 months, while tetrabutylammonium bromide (TBAB) offers poor surface coverage, favoring the PNC's deterioration. This contribution highlights an alternative for preparing highly luminescent alcohol‐dispersed PNCs, with promising applicability in light‐emitting applications.