Abstract
Nanophosphors in the amorphous state were produced for the first time by pulsed electron beam evaporation of micrometer-sized polycrystalline phosphors of the composition Ca2Y8 (SiO4)6O2: Eu. It was found that the Raman spectrum is modified and the forbidden band width of the samples increases when the particle size lowers from micro- to nanodimensional state. The spectral luminescent characteristics in polycrystalline and amorphous states have been examined. It was established that during the transition to nanoamorphous state the phosphors change their photoluminescence color from red-orange (Eu3+) to blue (Eu2+).
Highlights
The processes of formation of nanophosphors and the study of the nature of their luminescence represent a topical problem
The microscopy and electronography data show that the NP are practically amorphous (JEOL JEM 2100 microscope)
The large extent of the exothermic peak is indicative of a slow kinetics of amorphous NP transformation into crystalline powder, which is most likely to be due to different granulometric composition of amorphous nanoparticles
Summary
The processes of formation of nanophosphors and the study of the nature of their luminescence represent a topical problem. Of interest is the effect of nanodimensional state of phosphors on radiationless losses and luminescence yield, on broadening and displacement of bands, on the variation in the structure of optical centers, as well as on vibrational spectra. Silicates with oxyapatite structure are known as effective matrices for luminescent materials if they are activated with RE ions [1,2,3,4,5,6,7,8]. There is no information in the literature about the production of nanophosphors based on silicates of the composition Cа2Y8(SiO4)6O: Eu in amorphous state*. It is known that nanophosphors can find application in nanophotonics [9, 10]. New nanophosphor can be used as components to create white LEDs
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