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The method to regulate the concentration of graphene oxide (GO) via changing polarity of solution was developed, then the Tb(acac)n(PMA)n/GO composites were synthesized by coordination bond. The tunable photoluminescence property is achieved under different concentration of GO dispersion. The mechanism of tunable luminescence also is elucidated in details. Simultaneously, the strong thermal stability of Tb(acac)n(PMA)n/GO complexes series is performed because of the function of PMA, which suggests potential application in optical fields such as photo-electric device. [ABSTRACT FROM AUTHOR]

Excitation dependent luminescent materials, which have attracted significant scientific attention in the field of information security owing to information storage and luminescence properties. However, it remains a formidable challenge in developing excitation dependent luminescent materials with a simple synthesis method and predictably modulated luminescent outputs. Herein, a novel Ln3+/Fluorescent dyes@MOFs strategy is developed to generate excitation dependent continuous color-changing luminescent materials via a hydrothermal method and post-synthetic modification (PSM), based on metal-organic frameworks (MOFs) matrix doped with lanthanide cations and fluorescent dyes encapsulated into the lanthanide MOFs. The continuous proportional emission of mixed luminescence appeared within a single matrix in response to the different excitation wavelength and the proportional emission control (PEC) mechanism between the two luminescent centers is proposed. In addition, the photoluminescence platform demonstrates a distinct security method based on covert color that are controlled by distinct excitation wavelengths and excellent luminescence stability have also been verified in these new materials. • Ln3+/Hoc@UIO-66(DPA) achieve excitation wavelength-dependent continuous color-tunable luminescence in a single mixture. • Proportional emission control (PEC) mechanism is proposed. • Ln3+/Hoc@UIO-66(DPA) (Ln = Eu, Tb) materials have potential applications in the field of anticounterfeiting. • The materials are acid and alkali resistant, have high thermal stability, and can be multi-functional luminescent. [ABSTRACT FROM AUTHOR]

In this paper, a graphene oxide/rare-earth complexes hybrid material without 1,10-Phenanthroline based on 4′-paraphenyl-carboxyl-2,2':6′,2″-terpyridine (Hcptpy) as ligand, graphene oxide sheets (GOSs) as inorganic matrix and europium ion as luminescence center has been synthesized via non-covalent approach between GOSs and Hcptpy. This obtained hybrid material exhibits stronger luminescence intensity, better thermal stability and longer decay lifetime than pure Eu3+ complexes. Moreover, a transparent and strongly luminescent thin film also is prepared by self-assembly at room temperature. This thin film shows great potential applications in the area of optics. • A GOSs/rare-earth complexes hybrid material was synthesized without Phen. • The obtained hybrid material exhibits better performance than pure Eu3+ complexes. • A polymer film was synthesized by self-assembly of Eu-Hcptpy/GOSs and PMMA. • The obtained film has excellent transmittance and luminescent properties. [ABSTRACT FROM AUTHOR]