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Zn1-xTMxS [(TM: Fe or Ni); (0.00001 les x les 0.1)] nanocrystals have been synthesized using well known bottom-up synthesis technique; colloidal chemical coprecipitation method. Powder X-ray diffractometer and Transmission Electron Microscope (TEM) have been used for crystallographic and morphological characterization. Analysis of recorded broad X-ray diffraction patterns show zinc blende structured...
Phosphor materials, such as Cr doped spinel (MgAl2O4|), garnet (Y{ub3}Al5O12) and sapphire (Al2O3) crystals and composites of these materials are developed for a highly sensitive thermo-sensor in fluorescence thermometer excited using LED. Temperature dependences of photoluminescence (PL) intensity from these materials are evaluated using LED excitation. PL intensity from sensor materials decreases...
Thermal imaging technique is useful for detecting 2-dimensional spatial distribution and temporal variation of temperature. Thermal images of foods during the cooking process and/or pulse heating process are observed for evaluating the quality of foods in the volume fabrications. Inhomogeneous temperature distribution of a pancake can be observed during the baking process. Water concentration of flour...
Spinel crystals (Cr doped MgAl2O4) with various Cr2O3 and MgO concentrations are grown using floating zone technique for fluorescence thermometer application. Temperature dependence of photoluminescence (PL) intensity is evaluated using spinel crystal and/or composite of spinel with silicone resin. PL intensity from spinel crystal and composite decreases linearly with temperature. Spenel crystal and...
Temperature monitoring is essentially important for stable control of fabrication processes. In order to develop a convenient 2-dimensional temperature monitoring system using a thermo-paint, photoluminescence (PL) images are observed from the luminous paints at various temperatures. Commercially available and in-house modified luminous paints are evaluated for improving temperature sensitivity and...
Various materials, such as spinel (MgAl2O4), garnet (Y3Al5O12), sapphire (Al2O3), YAlO3 and long afterglow phosphors (CaAl2O4, SrAl2O4) crystals and composites of these materials are developed for a highly sensitive thermo-sensor in fluorescence thermometer application. Temperature dependences of photoluminescence (PL) lifetime and/or PL intensity from sensor materials are evaluated using crystals...
The SrAl2O4: Eu2+, Dy3+ phosphor nanoscale powders with high brightness were prepared by a nano-coating process. The resulted SrCO3@ Al2O3 core-shell precursors were characterized by transmission electron microscope (TEM), which indicates that the precursor particles have narrow size distribution. The structure and optical properties of the phosphor powders were investigated systematically by means...
A phosphor for plasma display panel, BaMgAl/sub 10/O/sub 17/:Eu/sup 2+/, showing a blue emission band at about 450 nm, was prepared by a solid-state reaction using BaCO/sub 3/, Al/sub 2/O/sub 3/, MgO, Eu/sub 2/O/sub 3/ as starting materials with flux AlF3. Concentration quenching decreased of emission intensity was shown at about 2.25/spl sim/2.3 wt% of Eu due to a decrease in the critical distance...
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