Bio-mediated Combustion Synthesis and Color Characteristic Studies of Y₂O₃:Tm³⁺ Nanoscale Superstructures

Mimosa pudica(MP) plant extract was used to prepare Y₂O₃:Tm³⁺ (1-11mol %) nanoscale superstructure with nitrate source as precursors. The samples were characterized by advanced characterization techniques. The PXRD peaks indicates crystalline, no impurity peaks were present with body centre cubic structure of Y₂O₃. Photoluminescence emission spectra shows blue color emission at 358 nm excitation wavelength. The major peak of Tm³⁺ was at 453 nm and two very weak peaks were observed at ∼ 474 nm attributed to the transitions of ¹D₂ → ³ F₄ and ¹G₄ → ³H₆, res. The calculated color co-ordinates were matches to the NTSC blue color. Correlated color temperature was ∼ 4000 K. So the Y₂O₃:Tm³⁺ nanophosphor could be used for blue component in the warm WLED and SSL devices. (paper)