Abstract
AbstractWhite-light emitting lanthanide(iii) metal-organic coordination polymers (LMOCPs) were prepared via a green synthesis method performed in pure aqueous solution at room temperature without using toxic solvent and reagents. This kind of LMOCP, denoted as adenosine monophosphate (AMP)/Ln-CIP, was composed of Ln3+ {Ln = Tb (1), Eu (2), and Gd (3)}, hydrosoluble biomolecule of AMP, and nonpoisonous antenna ligand of CIP (ciprofloxacin). The complex of Tb(1), Eu(2), and Gd(3) in AMP/Ln-CIP emits strong green, red, and blue light, respectively. With careful adjustment of the doping mole ratio of the three lanthanide ions {Ln = Tb:Eu:Gd = 0.1:0.9:99.0} in one framework, white light-emission can indeed be achieved. AMP/Ln-CIP is network-structural and amorphous by transmission electron microscope and X-ray diffraction analysis. The fluorescence lifetime and quantum yield of AMP/Ln-CIP are 4.36 ms and 36.5%, respectively.
Highlights
White light-emitting materials have received tremendous attention because they can be applied in many practical domains, such as light-emitting diodes, electrochemical cells, and many other types of light-emitting devices [1,2,3,4,5,6]
These white light materials were obtained through three strategies: (1) a single component emitting in the whole visible region from 400 to 700 nm, (2) a two-chromophore containing component emitting blue and yellow or orange, and (3) a three-chromophore containing emitting primary colors [6,7,8,16,17,18]
scanning electron microscope (SEM) images showed that adenosine monophosphate (AMP)/Tb0.1Eu0.9Gd99.0-CIP was the same network-exterior as the single AMP/Ln-CIP {Ln = Tb(1) or Eu(2) or Gd(3)} (Figure 1)
Summary
White light-emitting materials have received tremendous attention because they can be applied in many practical domains, such as light-emitting diodes, electrochemical cells, and many other types of light-emitting devices [1,2,3,4,5,6]. The white-light-emitting materials reported to date were mainly concentrated on metal-organic hybrid materials [7,8,9,10], inorganic nanocrystals [11,12], quantum dots [13,14], and small organic molecules [15]. Compared with crystal metal-organic framework, amorphous LMOCP possesses higher tailorable properties, milder reaction conditions, and wider diversity of composition [30] These facts would afford an infinite number of possible white light-emitting materials and improve the overall optical features. With careful adjustment of the relative concentration of the lanthanide ions and excitation wavelength, the white light-emitting phosphor can be obtained via the red emission of Eu3+ and green emissions of Tb3+ combined with blue luminescence of CIP (Scheme 1)
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