title: Luminescence enhancement after adding organic salts to nanohybrid under aqueous condition.
abstract: Lanthanide-based organic-inorganic hybrid materials (LnOIH) are of immense importance for various applications nowadays, while it still remains a significant challenge to achieve high luminescence efficiency in aqueous environment. Herein we present a simple and environmentally friendly two-step strategy to prepare strongly red-light emitting nano-LnOIH by first in situ forming Eu(3+)-β-dikeonate complexes on Laponite platelets and subsequently increasing the coordination number of the complexes via the modification with a silane-functionalized imidazolium salt, which can fully protect Eu(3+) ions from the water molecule quenching. The mechanism of how the imidazolium salt favors the formation of Eu(3+)-β-dikeonate complex with large coordination number was elucidated. The result is that the removal of the abundant protons on the Laponite platelets through a mechanism of synergic effect of ion exchange and neutralization drives the formation of Eu(3+)-β-diketonate complexes with high coordination number. The high efficiency of the resulting luminescent nano-LnOIH in water endows the nanohybrid with good aqueous solution processability and opens the possibility of using them under complicated aqueous conditions for biorelated applications.
authors.affiliation: School of Chemical Engineering and Technology, Hebei University of Technology , GuangRong Dao 8, Hongqiao District, Tianjin 300130, China.
authors.forename: Daqing
authors.initials: D
authors.lastname: Yang
authors.forename: Yige
authors.initials: Y
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Li
authors.forename: Huanrong
authors.initials: H
authors.lastname: Li
mesh_terms: D005063:Europium / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D049329:Nanostructures / Q000737:chemistry*
chemical_list: D007477:Ions; D028581:Lanthanoid Series Elements; D005063:Europium
keywords: Laponite; flexible film; lanthanide; luminescence; nanohybrid