Photoluminescence of Y3(Al, Ga)5O12:Ce3+ Nanoparticles by a Reverse Micelle Process

Abstract

Trivalent cerium-ion-doped Y 3 (Al, Ga) 5 O 12 nanoparticle phosphor nanoparticles were synthesized using the reverse micelle process. The Ce doped Y 3 (Al, Ga) 5 O 12 particles were obtained from nitrate solutions dispersed in the nanosized aqueous domains of a micro emulsion consisting of cyclohexane as the oil phase and poly(oxyethylene) nonylphenyl ether (Igepal CO-520) as the non-ionic surfactant. The crystallinity, morphology, and thermal properties of the synthesized Y 3 (Al, Ga) 5 O 12 :Ce 3+ powders were characterized by thermogravimetry-differential thermal analysis (TGA-DTA), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and transmission electron microscopy. The crystallinity, morphology, and chemical states of the ions were characterized; the photo-physical properties were studied by taking absorption, excitation, and emission spectra for various concentrations of cerium. The photo physical properties of the synthesized Y 3 (Al, Ga) 5 O 12 :Ce 3+ powders were studied by taking the excitation and emission spectra for various concentrations of cerium. The average particle size of the synthesized YAG powders was below 1 µm. 3+ is a red-emitting phosphor; it has a high efficiency for operation under near UV excitation, and may be a promising candidate for photonic applications.

Determination of the spectral dependence for the absorption coefficient of phosphor inorganic microparticles

“…Therefore, both the theory of these substances and their practical application are based exclusively on investigations of luminescent emission [1][2][3][4][5][6][7], diffuse reflection [8][9][10][11][12] and transmission spectra [13], excitation spectra [14][15][16][17][18] as well as on the absorption ones [19]. Since these investigations cannot provide separated registration of the parts of the scattered and absorbed light, it is not possible to calculate the main optical characteristic of powder materials -their absorption coefficient.…”