Polymeric Nanospheres Containing Rare Earth Complexes and Colloidal Crystals with Luminescent Properties
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Polymeric Nanospheres Containing Rare Earth Complexes and Colloidal Crystals with Luminescent Properties Xudong Yang, Zixi Zhao, Bowen Shen, Quan Lin* and Bai Yang State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China ABSTRACT Colloidal particles (CPs) have been the subject of intensive studies and have attracted increasing attention from the scientific community. In this contribution, we present the design and synthesis of luminescent colloidal crystal films. Rare earth complexes as the photoluminescent source is introduced into the polymeric nanospheres system, the diameter can be controlled by changing the polymeric reaction condition, which can act as building blocks to prepare diverse functional materials. Further, three-dimensional (3-D) colloidal crystal films with excellent fluorescent properties are fabricated by self-organization of the monodispersed polymeric nanospheres. The colloidal crystal film indicates a photonic band gap, which depends on the diameter and size-dispersing of the nanospheres building blocks. It shows potential applications in fabricating optical devices, data storage, chemical and biological sensors, and color displays. INTRODUCTION Colloidal particles (CPs) have been attracting attention in science and technology as they have been applied in a variety of research fields such as photonics,[1] optical filters switches,[2] surface patterning,[3] nano-lithography,[4] chemical and biochemical sensors[5] and so on. As well as they have been widely used as major components of industrial products, such as paints, inks, papers, and coatings, and so on. Functional polymeric colloidal particles are frequently studied in material science, chemistry, medicine, biology, electronics and information for their unique dimension, morphology and multifunction.[6] During the past decades, studies on colloidal particles have focused on constructing functional materials and devices such as photonic band gap materials from the self-organization of monodispersed colloidal particles.[7] Photonic band gap structures, also known as photonic crystals (PCs), are structures whose refractive index is periodic on the order of optical wavelengths, which prevents light from propagating through the structures due to Bragg reflection. The forbidden frequency range is called a stop band.[8] Photonic crystals in general can be fabricated by both bottom-up and top-down approaches[9]. Self-assembly techniques have many potential advantages in 3-D PCs fabrication, offering significantly lower costs and being more compatible with very large scale integration technologies than conventional lithographic techniques. A plethora of self-assembly methods have been developed by utilizing external forces including gravitational sedimentation, electric fields, capillary forces, oscillating stages, and temperature gradient.[10] These approaches have been demonstrated to yield high quality colloidal crystals containing few defects over large areas. Meanwhi
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