Highly Stable Perovskite Quantum Dots Modified by Europium Complex for Dual-Responsive Optical Encoding

Abstract

Inorganic perovskite quantum dots (QDs) have attracted great scientific attention in the field of luminescent materials, but the application has been limited by the inferior stability that results from highly dynamic capping ligands. In this work, we use a rare-earth complex to modify perovskite QDs with ligand exchange to realize perovskite functionalization; meanwhile, the stability of perovskite QDs is greatly improved. Density functional theory calculation results show that the adsorption energy of the europium complex to QDs is higher than that with traditional ligands, which provides a thermodynamic basis for stability improvement. Furthermore, the modified QDs exhibit attractive dual-response property, including temperature and pH response ascribed to QDs and europium complexes, respectively. The superior property can be applied to multi-stimuli-responsive optical encoding, which is further capable of enhancing the security of encrypted information. This study not only affords a strategy for the synthesis of highly stable perovskites but also provides a method for the functionalization of perovskites.

Two luminescent film sensors constructed from new lanthanide coordination polymers for ratiometric detection of Zn2+ and NH3 in water and their white emission properties

“…44–47 In past decades, many types of white light materials were reported, such as organic polymers, metal-doped inorganic materials, small organic molecules, quantum dots and nanocrystals, as well as metal complexes. 48–50 For white emission lanthanide coordination polymer materials, the white emission is often obtained by adjusting the ratio of the three primary colors of red, green and blue originating from the emissions characteristic of Tb 3+ , Eu 3+ and the organic ligand either by a co-doping strategy or by tuning the excitation wavelength or temperature. 51 As is well known, it is easy to achieve the color-tuning behaviors of lanthanide complexes through changing the type and proportion of the Ln 3+ ion, yet this method may result in a considerable waste of rare earth resources.…”

Photocontrolled reversible modulation of lanthanide luminescence in mesoporous silica nanospheres by photochromic diarylethenes

“…1b). [39][40][41][42][43] Compared with pure Eu(DBM) 3 Áphen, NH 2 -MSNs@Eu(DBM) 3 Áphen had a longer luminescence lifetime and lower quantum yield (Fig. S4 and Table S1, ESI †), and the reduction in quantum yield should be mostly attributed to the scattering and absorption losses of SiO 2 nanopowders, which can absorb and disperse the excitation light into the non-radiative processes.…”

Lanthanide-doped inorganic halide perovskites (CsPbX3): novel properties and emerging applications

“…Also, the fluorescence transitions switch between different states based on external factors such as temperature, dopant ions and their concentration, etc. Feng et al 198 reported a novel approach to modeling optical encoding materials using europium complex-decorated CsPbBr 3 quantum dots with highly stable dual-stimuli-response. The schematic illustration of the formation of the europium complex Eu(PBA) 3 AA (HPBA = N-(2pyridinyl)benzoylacetamide, AA = 8-aminooctanoic acid)-decorated CsPbBr 3 quantum dots is shown in Fig.…”