Abstract
Monoclinic yttrium tantalate (M′-YTaO4, M′-YTO), and two different kinds of yttrium niobium-tantalate (M′-YTa0.85Nb0.15O4 (M′-YTNO) and Eu3+ doped M′-YTa0.85Nb0.15O4 (M′-YTNO:Eu3+)) were produced by sol–gel method and grown on single crystalline Si (100) substrate by spin coating approach. Structural properties and thermal behaviours of the films were characterized by means of X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and thermogravimetry and differential thermal analysis (TG–DTA). Systematic Steady-state photoluminescence and lifetime measurements in a series of yttrium niobium-tantalate with varying amounts of Eu3+ were presented. The photoluminescence spectra of the films exhibited strong blue (380–400 nm) and red (614 nm) emissions upon ultraviolet excitation. Emission intensities were strongly dependent on the host lattice composition and film morphology. 1.5% Eu3+ doped films exhibited the brightest luminescence and long lifetime extending to 1.22 ms when excited at 254 nm. To the best of our knowledge, this is the first attempt in the production of M′-YTO, M′-YTNO, and M′-YTNO:Eu3+ films on single crystalline Si (100) substrate via sol–gel spin coating.
Highlights
Development of luminescent materials has been the topic of wide-range research in last decades
A weight loss peak is observed in the temperature range of 100–450 °C, corresponding to a broad exothermic peak because of the pyrolysis of the glacial acetic acid (GAA) and organic compound on the DTA plot
We have studied around 400 nm spectral range to be able to compare the emission characteristics of the all phosphors
Summary
Development of luminescent materials has been the topic of wide-range research in last decades. Yttrium tantalate (YTaO4, YTO) and yttrium niobate (YNbO4, YNO) are efficient as X-ray phosphors utilized in medical imaging These phosphors which could be used in electronic detector systems and in films/screen cassettes, fluoroscopy, tomography, and radiography, may be induced with lower energy sources such as electrons or ultraviolet (UV) light [3,4,5,6]. YTNO possesses wide and dense absorption bands centered in UV region due to charge transfer (CT) from oxygen to metal, which may potently transfer energy to rare earth activator composing rare earth characteristic emissions [8,9,10] Such luminescent emission could be altered toward longer wavelengths when rare earth (RE) ions such as Eu3+, Er3+, Ce3+, Dy3+, Sm3+, and Pr3+ are operated to partly substitute yttrium ions in the host lattice. The relationship between the structure and the luminescence performance of the phosphor films was scrutinized
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