Significant boost of the stability and PLQYof CsPbBr3 NCs by Cu-BTC MOF
Hari Shankar, William W. Yu, Youngjong Kang, Prasenjit Kar
Abstract
Abstract Developing stable perovskite nanocrystals (NCs) with enhancing luminescent properties holds great importance for future potential applications in optoelectronics. Here, we engaged perovskite NCs in Cu 2+ ion-based metal–organic framework (MOF) Cu-BTC (BTC = 1,3,5-benzene tricarboxylate) by physical mixing of MOF with CsPbBr 3 NCs in toluene solution. MOF-protected perovskite NCs achieved high photoluminescence quantum yield 96.51% than pristine state CsPbBr 3 NCs (51.66%). Along with the improvement in optical properties, the long-term stability of CsPbBr 3 NCs in the solution phase also increases considerably upon loading in Cu-BTC MOF. Moreover, the changes in the luminescent intensity of the samples have been observed for 3 months in the solution. After 1 month, pristine CsPbBr 3 NCs lose their emission intensity 68% from the initial, while the MOF-protected CsPbBr 3 NCs show only a 10% reduction from the initial. These results indicate that the effective passivation of Cu-BTC MOF inhibits the aggregation of NCs, protecting them from the defective atmosphere. The excellent photoluminescence findings provide a new pathway for future optoelectronic applications.