Investigation of Structural, Spectral and Photometric Properties of CaTiO3:Dy3+ Nanophosphors for the Lighting Applications

다국어 초록 (Multilingual Abstract)

A series of perovskite CaTiO3:Dy3+ nanophosphors have been preparedvia solid state reaction method in order to investigate the structural,spectral and photometric properties. The structural, morphological andspectral properties of prepared nanophosphors were systematicallycharacterized by XRD, FESEM, EDX, Photoluminescence, PL decaytime and UV-Visible spectroscopy. The novel CaTiO3:Dy3+ nanophosphorsexhibited single phase orthorhombic structure with space group Pbnm.
The high magnification FESEM images of prepared sample demonstratedthe particle size in the range 220-240 nm. The photoluminescenceproperties of Dy3+ doped CaTiO3 nanophosphors were investigatedthrough excitation, emission spectra and decay time by varying theconcentration of activator (Dy3+). Under the excitation of 386 nm UVlight, Dy3+ activated CaTiO3 nanophosphors exhibited its characteristicexcellent intense emissions in blue and yellow region around thewavelength 484 and 575 nm due to the transition 4F9/2→6H15/2 and 4F9/2→6H13/2 respectively. The photometric parameters such as CIE-coordinate and correlated color temperature (CCT) was alsocalculated. The CIE- coordinate (0.28, 0.32) was found near white light and CCT value was found to be 9222.31 K for optimumcomposition Ca0.96TiO3:0.04Dy3+ which was useful for cold light emission. The affirmative experimental results indicated thatthe prepared nanophosphors could be the favorable candidate for lighting applications.

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