Color-Tunable Luminescent Films Based on the Hybrid Assemblies of [EuW10O36]9-, Bis( N-methylacridinium) Nitrate, and Layered Double Hydroxide.

Ordered luminescent ultrathin films (UTFs) have been fabricated by means of layer-by-layer assembling of Na₉[EuW₁₀O₃₆] ·32H₂O (abbreviated as EuW₁₀), the photoactive organic molecule of bis( N-methylacridinium) nitrate (denoted BNMA), and exfoliated Mg₂Al-LDH (layered double hydroxide). The assembly process has been monitored by UV/Vis absorption and fluorescence spectroscopy to obtain a stepwise and regular growth of the UTFs upon increasing the deposited cycles. The alternative intercalation of EuW₁₀ and BNMA into LDHs results in the formation of well-ordered UTFs with tunable color. Each LDH monolayer with rigid structure provides a confined and protective microenvironment for BNMA and EuW₁₀, and the guest molecules exhibit orientation effect. [ABSTRACT FROM AUTHOR]