Preparation and Properties of CaTiO3:Pr3+/TiO2-mica Fluorescent Pearlescent Pigments

doi:10.15541/jim20140149

Abstract

Abstract:

Double-layer of titanium dioxide and Pr-doped calcium hydroxide were coated on the surface of mica by liquid phase deposition, and followed by calcination to form the Pr-doped calcium titanates fluorescent layer. The resultant CaTiO₃:Pr³⁺/TiO₂-mica fluorescent pearlescent pigments were characterized by photoluminescence excitation (PLE) and emission (PL), automatic colorimeter (AC), X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM), respectively. The fluorescent pearlescent pigments obtained at the calcium oxide cladding ratios of 5.3%, the praseodymium/calcium nitrate molar concentration of 0.2%, and the calcinations temperature of 900 ℃, show good pearl property with homogeneous, dense and smooth surface, and relatively high fluorescence intensity. The excitation spectrum of these fluorescent pearlescent pigments consists of three bands at 264, 304 and 380 nm. The maximum emission wavelength is found to be a red light of 613 nm, corresponding to the transition for ¹D₂→³H₄.

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Key words: fluorescent, pearlescent pigments, CaTiO3:Pr3+

CLC Number:

TQ626

ZHOU Wei-Ming, CHEN Qing-Hua, KE Mei-Zhen, WU Nan, LUO Yong-Jin, ZHANG Hua-Ji, QIAN Qing-Rong. Preparation and Properties of CaTiO₃:Pr³⁺/TiO₂-mica Fluorescent Pearlescent Pigments[J]. Journal of Inorganic Materials, 2014, 29(12): 1275-1280.

Figures/Tables 8

Fig. 1 PL spectra and relative fluorescence intensity of samples with various cladding ratios (inset)

Fig. 2 The brightness and degree of saturation of samples with various cladding ratio

Fig. 3 XRD patterns of samples calcined at various temperatures

Fig. 4 PL spectra and relative fluorescence intensity (inset) of samples calcined at various temperatures

Fig. 5 PLE (a) and PL (b) spectra of samples with various praseodymium molar concentrations of calcium nitrate

Fig. 6 SEM images of fluorescent pearlescent pigments (a) mica, (b) TiO2-mica pearlescent pigments, (c) fluorescent pearlescent pigments, (d) fracture surface of fluorescent pearlescent pigments

Fig. 7 Laser particle size distribution of TiO2-mica pearlescent pigments and sample

Fig. 8 Images of samples under bright light (a) and 254 nm UV (b)

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Preparation and Properties of CaTiO₃:Pr³⁺/TiO₂-mica Fluorescent Pearlescent Pigments

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