Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



High-stability fluorescent perovskites embedded in PbBrOH triggered by imidazole derivatives in water

Author affiliations

Abstract

The optoelectronic application of fluorescent lead halide perovskite (LHP) nanocrystals is limited by their poor stability in humid atmosphere. However, we found that high-quality and high-stability fluorescent perovskites embedded in PbBrOH can be synthesized via the reaction of PbBr2 with MBr (M: Cs or CH3NH3+) triggered with imidazole derivatives in water. Imidazole can etch and hydrolyze the nonluminescent MPbBr3 to form high-quality fluorescent perovskites. After the perovskites are formed, a protective PbBrOH matrix grows rapidly on the surface of the perovskite nanocrystals and acts as a water-resistant layer. The embedded fluorescent perovskites can exhibit great stability even in water, heat and UV light with a PLQY of up to 30%. Density functional theory (DFT) calculations show that the enhanced stability results from the positive energy cost of the water molecule entering the lattice of PbBrOH, which is much higher than the negative value for water entering CsPbBr3; therefore, water is prevented by the PbBrOH surface from entering the embedded fluorescent perovskite. The PbBrOH surface layer has twofold beneficial effects: (i) preventing water from entering the perovskite nanocrystals, (ii) dispersing the perovskite nanocrystals in the matrix and preventing their aggregation so that highly luminescent composites can be formed. Our strategy opens a new avenue for the development of high-efficiency and high-stability fluorescent inorganic and organic perovskites.

Graphical abstract: High-stability fluorescent perovskites embedded in PbBrOH triggered by imidazole derivatives in water

Back to tab navigation

Supplementary files

Article information


Submitted
24 Feb 2020
Accepted
13 Mar 2020
First published
14 Mar 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

High-stability fluorescent perovskites embedded in PbBrOH triggered by imidazole derivatives in water

H. Lin, X. Zhang, L. Cai, J. Lao, R. Qi, C. Luo, S. Chen, H. Peng, R. Huang and C. Duan, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC00939C

Social activity

Search articles by author

Spotlight

Advertisements