Journal of Materials Science Research; Vol. 8, No. 3; 2019 ISSN 1927-0585 E-ISSN 1927-0593 Published by Canadian Center of Science and Education 1 Luminescence Spectra of C 6 H 9 EuO 6 x H 2 O Doped Synthetic Opals Matrix Containing Bi-Active Dielectrics Bilal Abu Sal 1 1 Applied Physics Department Faculty of Science, Tafila Technical University, Tafila, Jordan Correspondence: Bilal Abu Sal, Applied Physics Department Faculty of Science, Tafila Technical University P.O. Box 179, Al-Eis 66110, Tafila, Jordan. E-mail: bilal_abu@hotmail.com Received: May 10, 2019 Accepted: June 18, 2019 Online Published: July 15, 2019 doi: 10.5539/jmsr.v8n3p1 URL: https://doi.org/10.5539/jmsr.v8n3p1 Abstract This paper presents the results of experimental studies for the luminescence spectral intensity redistribution of opal photonic crystals containing various active dielectrics - Bi 12 SiO 20 , opal - Bi 2 TeO 5 and opal - NaBi(MoO 4 ) 2 matrix nanocomposites and filled with europium C 6 H 9 EuO 6 x H 2 O salt. Ultraviolet excitation was provided by semiconductor laser operating at wavelengths of 400nm and 100 mW average power. An increase in the integral luminescence intensity of the matrix composite opal - Bi 12 SiO 20 : Eu 3+ was found. The possibility of the participation of bismuth ions as a co-activator and luminescence concentrator also is analyzed. It has been proposed to use opal-Bi 12 SiO 20 nanocomposite filled with europium as a potentially attractive material to improving the solar cell efficiency. Keywords: Photoluminescence, Synthetic Opals, Matrix Nanocomposite, Solar Cell 1. Introduction In the recent years the nanotechnologies related to the fabrication and application of nano-structural photonic-crystals active dielectrics doped is of fundamental interest for the physics of low-dimensional systems. The investigation of optical properties for new luminescent materials on the basis of synthetic opals which represent a class of 3D photonic crystals and offer a potentially opportunities to investigate the effect of spontaneous emission, low-threshold lasing, information processing and transferring (Joannopoulos, Villeneuve, & Fan, 1997). In (Aliev et al., 2002; Li et al., 2007; Gorelik, Lepnev, & Litvinova, 2017) it is shown that erbium (Er 3+ ), europium (Eu 3+ ) and terbium (Tb 3+ ) are perspective materials for filling opal pores. Special interest from the scientific and practical points of view represents nanocomposites opal-active dielectric, which activated by luminescent centres. The present work is devoted to study the influence of nanocrystalline structure of europium ions and photonic - crystal effects on the photoluminescence spectra matrix nanocomposites of opal-Bi 12 SiO 20 opal - NaBi(MoO 4 ) 2 , and opal - Bi 2 TeO 5 , infiltrated with europium C 6 H 9 EuO 6 x H 2 O salt. The aim of present work is to clarify the nature of emission and comparing spectra of essential opal and dielectrics-infiltrated synthetic opals with europium. 2. Experimental Setup Bulk synthetic opals crystals were grown through slow crystallization from monodisperse colloidal suspension of globules α - SiO 2 synthesized by modified Stöber method (Stöber, Fink, & Bohn, 1968). For different samples the values of the diameter of the globules and the interplanar distance was varied in the range D = 295 - 306nm d = 241 - 250nm. The spectral position of the photon stop -zone for the samples of essential opals corresponded to the range 593 - 614nm in the direction (111). The fabrication of nanocomposites was carried out by filling the pores of opal samples with the melt of single crystals Bi 12 SiO 20 (BSO), NaBi(MoO 4 ) 2 (NBMO) and Bi 2 TeO 5 (BTO) under the influence of capillary forces. The fact of filling the pores of opal with melting were detected by shift of the band maximum of a Bragg reflection in the wavelength region. Due to the high refractive index of crystals (n BSO = 2.54; n NBMO = 2.25; n BTO = 2.36; λ = 632.8nm) to detect the peak of the Bragg diffraction of light in the visible region of the spectrum, large reflection angles were used (60 0 ). Based on comparison the position of the maximum of the measured reflection spectrum of nanocomposite sample and the calculated value of λ m , under the condition of 100% filling of the pores with melt, the percentage of filling the pores was determined, which was ~ 50% of volume. For all nanocomposites, it was found that the substance in the opal pores is in the crystalline state. This is confirmed by the characteristic form of the measured X-ray diffractgrams (X-ray diffractometer PW3040/60).