Todays, pigments are widely used anywhere — since, almost every artificial object is colored. Therefore, huge amounts of different pigments are produced every year. Unfortunately, used pigments cannot be further recycled. In addition to this, modern technologies demand functionalized materials. Thus, modern pigments required to be nontoxic, with high qualities such as color stability, stability to the environmental factors, etc. and additional functional features. Pigments based on the copper-doped apatite-type materials were discovered in 2001 with copper-doped strontium hydroxyapatite, which exhibit bright purple color. After that, the copper-doped barium and calcium hydroxyapatites were successfully achieved (with blue and magenta colors, respectively). It was found further that the additional apatite-matrix modification results in the color change: copper-doped calcium-lithium, calcium-yttrium, calcium-bismuth, and calcium-lanthanum apatites are vine-red, khaki, sand yellow and pink, respectively. It was established recently that two types of chromophore exist within copper-doped apatite matrix (Fig.1): 1. Intrachannel oxocuprate anion [O-Cu-O]— which is formed inside the hexagonal channels of apatite structure, presents in all mentioned apatite-type pigments; 2. Copper ion at the Ca(2) position, which is formed in the hexagonal channel’s walls, additionally presents in copper-doped calcium-lithium, calcium-yttrium, calcium-bismuth, and calcium-lanthanum apatites; The combination of luminescent properties and stable color is realized in current work. Europium- and copper-doped calcium apatite was synthesized via solid state method. Europium-and-copper-doped materials demonstrate pink color and unusual luminescent properties, which are connected with the low symmetry crystal field influence. Chromophore and luminophore formation was analyzed and described. Conclusions are based on the data obtained from luminescent, Raman and diffuse reflectance spectroscopy results and the XRD phase analysis.

Crystal structure features and luminescent properties of the copper-doped Ca-Eu apatite

253rd National Meeting (2017)

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