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Er3+ doped BST nanoparticles with Aurivillius layered structure are synthesized through common solid-state method. Photoluminescence spectroscopy has shown that these oxides are capable of emitting light under UV (366 nm) and IR (980 nm) source. The effect of Er3+ to Yb3+ concentration ratio on upconversion emission are investigated and possible upconversion and energy transfer mechanisms are suggested based on the number of photons participating in UC process. Shift in the upconversion emission from green to red region is visualized by CIE chromaticity diagram. The superiority of coexistence of stoke and anti-stoke emission in a single host lattice with a single activator ion, besides to tunability of UC luminescence only by controlling sensitizer/activator ratio are very interesting features which can be used to produce dual mode multicolor luminescent ink with high security level against forgery.

In the present work, unilamellar [SrTa 2 O 7 ] 2− perovskite nanosheets with variable lateral dimensions were synthesized via a high-yield, three-step liquid exfoliation route from layered Bi 2 SrTa 2 O 9 . The photocatalytic activity of the parent and exfoliated layered perovskites was evaluated for the photocatalytic dye degradation of Rhodamine B under UV light (254 nm) and reduction of water to H 2 under the full solar spectrum. A comparative study of the photocatalytic behavior of unilamellar [SrTa 2 O 7 ] 2− perovskite nanosheets and parent layered structure showed a significant improvement in both hydrogen evolution (98.20 vs 3 μmol g −1 ) and Rhodamine B degradation time (180 vs 30 min), with the restacked nanosheets. The exfoliation of layered perovskites not only increases their specific surface area, providing more active sites, but also reduces the recombination probability of electrons and holes due to their unilamellar structure and reduced charge transport pathways. The synthesis and preparation of strong acid solids such as [SrTa 2 O 7 ] 2− perovskite nanosheets can be a promising approach for effective adsorption of pollutants with cationic nature and more efficient electron transfer between the dye and catalyst. Finally, the photocatalytic characteristics of the restacked unilamellar [SrTa 2 O 7 ] 2− nanosheets remained unchanged after three successive cycles of recycling−reusing.

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Background and Aim: The present study aimed to evaluate the effectiveness of forgiveness-oriented group counseling based on Islamic perspective to restore the marriage relationship after marital infidelity in married women who referred to counseling centers in Tehran. Materials and Methods:This study is a randomized clinical trial. The statistical population of the study consisted of the women who referred to counseling centers of Tehran in 2015 due to their husbands' infidelity. Thirty women were randomly assigned into intervention and control groups. Having conducted the pre-test using the forgiveness questionnaires, the intervention group took part in nine weekly sessions of forgiveness therapy based on the Islamic perspective. Then, the post-test was carried out using the same questionnaire for both groups. The data were analyzed in SPSS 18 software using analysis of covariance. Ethical Considerations: After presenting the research objectives, emphasizing the confidentiality of the information and obtaining patients' verbal consent to participate in the study, the questionnaires were distributed among the participants to be completed. Findings: The mean ages of the participants in the intervention and control groups were 33.41 and 35.32, respectively and the mean durations of their marriages were 9.11 and 10.33 years, respectively. There is no significant difference in demographic characteristics between two groups (P>0.05). The pre-test and post-test mean scores for forgiveness in the intervention group were 18.33 and 34.33, respectively. Forgivenessoriented group consulting based on Islamic perspective had a significant effect on increasing women's willingness to forgive (P<0.01). Conclusion:The findings signified using forgiveness-oriented group counseling based on the Islamic perspective in planning therapeutic interventions.

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