Multicolor luminescent hybrid assembled materials based on lanthanide-containing polyoxometalates free from energy transfer crosstalk

Abstract

A series of multicolor luminescent hybrid materials based on three primary molecular pixel components, isostructural lanthanide-containing inorganic clusters LnW₁₀, i.e. red-emissive Na₉EuW₁₀O₃₆ (EuW₁₀) and green-emissive Na₉TbW₁₀O₃₆ (TbW₁₀), and a blue-emissive small organic molecule quinine were constructed in a general and straightforward way. The neutral-cationic block copolymer poly(ethylene oxide)₁₁₄-b-poly(2-(2-guanidinoethoxy)ethyl methacrylate)₂₃ (PEO₁₁₄-b-PGu₂₃) electrostatically co-assembles with the inorganic clusters LnW₁₀ into micelles, and consequently effectively prohibits the energy transfer between LnW₁₀ and quinine. Three luminescent elements possessing independent emission properties in supramolecular assemblies, like molecular pixels, were deeply investigated for the first time. On the basis of additive color theory, fluent emitting color changes within the triangle enclosed by the luminophores in the chromatic diagram were achieved at diverse mixing ratios and exciting wavelengths with precise prediction and convenient reproduction.