Nowadays apatite-like compounds and impurity-doped apatites (Me₁₀(ZO₄)₆X₂) have been studied extensively since they are widely used as luminescence materials for optical ceramics and light converting coatings. Technology trade development of luminescent nanoceramics requires the controllability of particle size and shape as well as phase composition of crystalline material. Properties of apatite nanocrystals are the subject of considerable controversy connected with nano-sized effects and site-selective emission spectra. Therefore the effect of synthesis conditions on physical and chemical properties of nanocrystalline phosphors is the topical problem.

Nano-crystalline polymer-stabilized fluorapatite doped with Eu³⁺, Tb³⁺, Ce³⁺ (hereafter FAP:REE³⁺) has been synthesized from aqueous solution. The samples were studied by XRD, SEM, TEM and XPS methods. It is shown that during the synthesis of nanocrystalline FAP from aqueous solution the contamination of CaF₂ phase (30-50 nm crystals) is difficult to avoid. Synthesis conditions were optimized for preparing monophase polycrystalline FAP:REE³⁺. Effective segregation coefficients of REE at various conditions were determined. Coherent length of the perfect crystalline domains along 002 direction is 15-50 nm. FAP:REE³⁺ nanocrystals (50-200 nm in length) have complex rod-like and plate-like structure. Cell parameters varying with dopant concentration and are a = 9.376-9.450, c = 6.863-6.872.

The influence of REE concentranion, temperature and annealing duration on luminescence intensity was studied.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/9745 must be provided.

1. The morphology, luminescence and photovoltaic characteristics of MEH-PPV/nanocrystal ZnO hybride films with perylene dyes as interface modifiers
2. Formation features of stabilized Y₂O₃ nanopowders with controlled structural and morphological characteristics
3. Crystalline phosphors based on mono-sized (R_1-xEu_x)₂O₃ (R=Lu, Y) nanopowders with the spherical morphology
4. Structural and morphological properties of new composite nanocrystalline Y₂O₃/ZnO spheres
5. Fabrication and characterization of highly-concentrated Nd-doped YAG laser ceramics
6. The phase state of polymer nanocomposite versus the surface modification of quantum dots
7. Lutetium oxide nanoparticles and ceramics on their basis
8. Obtaining of luminescent core-shell hetero-nanoparticles SiO₂(core)/ZnO(shell) for photonic application
9. Formation and study of luminescence ceramics based on polycrystalline calcium fluorapatite doped with europium ions
10. The template synthesis of ensembles of isolated Au nanocrystals in silicium dioxide shell
11. Highly oriented dense calcium fluorapatite biomimetically grown on metal substrates
12. Optical ceramics based on cubic refractory oxides via vacuum sintering
13. Obtaining of semiconductor nanocrystals and formation of ensembles on their basis.
14. Mechanisms of heterogenous growth of calcium fluorapatite coatings from strongly supersaturated aqueous solutions
15. Physico-chemical properties of borate single crystals of different structural types