$SrAl_2O_4:;Eu^{+2},;Dy^{+3}$ Nanoliflerin Faz Kararlılığı Üzerine Bor Katkısının Etkisi

Bu çalışmada, sol-jel metoduyla katkısız, evropyum ve disprosyum katkılı $SrAl_2O_4$ ve bor katkılı $SrAl_2O_4:;Eu^{+2},;Dy^{+3}$ fosformalzemeleri olmak üzere üç farklı grup hazırlanmıştır. Sol-jel metodunda alüminyum, strunsiyum, evropyum ve disprosyumunnitratları başlangıç kimyasalları olarak kullanıldı. Bor katkısının nanoliflerin faz stabilitesi üzerindeki etkisini görmek için farklıoranlarda bor eklenmiştir. Deneysel çalışmalarda elektroeğirme yönteminde süreç değişkenleri olarak; uygulanan voltajın etkisi,şırınga iğnesi ve toplayıcı plaka arasındaki mesafe incelenmiştir. Fosforesan örneklerinin karakterizasyonu, DSC/TG, XRD ve SEMile gerçekleştirilmiştir. Tozların DSC/TG analizi sonucunda toplam ağırlık kaybı 25°C ve 1300°C sıcaklıkları arasında$SrO.Al_2O_3.xB_2O_3$ için %68,8, $SrO.Al_2O_3.xB_2O_3$x=0.2 için %65,43 ve $SrO.Al_2O_3.xB_2O_3$ x=0.4 için %69,87. Sentezlenen tozlarınXRD analizi sonucunda, yapının katkısız ve Eu-Dy katkılı numunede monoklinik SrAl2O4 formunda olduğu ve ortorombik kristalyapılı Sr4Al14O25 yapısına dönüştüğü gözlemlenmiştir. Fiber boyut ve dağılımı FibraQuant 1.3 yazılımı ve SEM görüntüleriyardımıyla belirlenmiştir. Fiberlerin ortalama çapları sırasıyla $SrO.Al_2O_3.xB_2O_3$, $SrO.Al_2O_3.xB_2O_3$ x=0.2 ve $SrO.Al_2O_3.xB_2O_3$ x=0.4için 604 nm, 419 nm ve 285 nm’dir. Nanoliflerin SEM fotograflarını inceleyerek, bor katkısının nanolif yapı üzerinde önemli biretkiye sahip olduğunu ve bor miktarındaki artışı, daha düzenli ve daha küçük çaplı nanoliflerin meydana geldiği gözlemlenmiştir.Sonuç olarak, bor katkısının $SrAl_2O_4$: Eu, Dy yapısının termal, mineralojik ve morfolojik özellikleri üzerinde önemli bir etkisi olduğubelirlenmiştir.

Effect of Boron Doping on Phase Stability of $SrAl_2O_4:;Eu^{+2},;Dy^{+3}$ Nanofibers

In this study, three varied groups as pristine, europium and dysprosium doped $SrAl_2O_4$ and boron doped $SrAl_2O_4:;Eu^{+2},;Dy^{+3}$ phosphorus materials were prepared by sol-gel method. In sol-gel method the nitrates of aluminum, strontium, europium and dysprosium were used as precursors. To see the effect of boron additive on phase stability of nanofibers, different ratios of boron were added. In the experimental studies, as process variables during the electrospinning method; the effect of the applied voltage, the distance between the syringe needle and collector plate were examined. The characterization of phosphorescence samples was carried out with DSC/TG, XRD and SEM. As a result of DSC/TG of powders total weight losses were 68.98% for SrO.Al2O3.xB2O3, 65.43% for $SrO.Al_2O_3.xB_2O_3$ x=0.2 and 69.87% for $SrO.Al_2O_3.xB_2O_3$ x=0.4 between 25°C and 1300°C. As a result of XRD analysis of the synthesized powders the structure was observed to be in monoclinic SrAl2O4 form in the pristine and Eu-Dy doped samples and turn into orthorhombic crystal-structured Sr4Al14O25 structure. The fiber size and distribution have been determined by FibraQuant 1.3 software and the SEM images. The average diameters of the fibers were 604 nm, 419 nm and 285 nm for $SrO.Al_2O_3.xB_2O_3$, $SrO.Al_2O_3.xB_2O_3$ x=0.2 and $SrO.Al_2O_3.xB_2O_3$ x=0.4, respectively. Through examining the SEM photos of nanofibers, it’s observed that boron additive has a significant effect on nanofiber structure and with the increase in the boron amount, much order and much small-diameter nanofibers occur. Consequently, it is determined that boron additive has a significant effect on thermal, mineralogical and morphological properties of $SrAl_2O_4$: Eu, Dy structure.

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Arıkan M. O. (2010) Synthesis Of Strontium Aluminate Based Phosphorescence Material By Solid State Reaction Method, MSc Thesis, Istanbul Technical University, Istanbul, Turkey.
Bezir N. Ç., Evcin A., Kayalı R., Kaşıkçı Özen M., Oktay A. (2015) Investigation of structural, electronic and optical properties of Ag-doped TiO2 nanofibers fabricated by electrospinning. Crystal Research and Technology, 51, 65–73. doi: 10.1002/crat.201500159
Chang C. K., Jiang L., Mao D. L., Feng C. L. (2004) Photoluminescence of 4SrO·7Al2O3 ceramics sintered with the aid of B2O3. Ceramics International, 30, 285–290. doi: 10.1016/S0272-8842(03)00101-9
Chang C., Yuan Z., Mao D. (2006) Eu2+ activated long persistent strontium aluminate nano scaled phosphor prepared by precipitation method. Journal of Alloys and Compounds, 415, 220–224. doi: 10.1016/j.jallcom.2005.04.219
Chang Y. L., Hsiang H. I., Liang M. T. (2008) Characterizations of Eu, Dy co-doped SrAl2O4 phosphors prepared by the solid-state reaction with B2O3 addition. Journal of Alloys and Compounds, 461, 598 603. doi: 10.1016/j.jallcom.2007.07.078
Chen I. C., Chen T. M. (2001) Sol-gel synthesis and the effect of boron addition on the phosphorescent properties of SrAl2O4 Eu2+,Dy3+phosphors. Journal of Materials Research, 16, 644-651. doi: 10.1557/JMR.2001.0122
Evcin A. and Ekşi F. (2018) SiO2 doped Carbon Nanofiber by Electrospinning. AIP Conference Proceedings 2042, 020002. doi: 10.1063/1.5078874
García C. R., Oliva J., Arroyo A., Garcia-Lobato M. A., Gomez-Solis C., Diaz Torres L. A.. (2018) Photocatalytic activity of bismuth doped SrAl2O4 ceramic powders. Journal of Photochemistry and Photobiology A: Chemistry, 351, 245-252. doi: 10.1016/j.jphotochem.2017.10.039
Hernández-Alvarado G. J., Montemayor S. M., Moggio I., Arias E., Trujillo-Vázquez E., Díaz-Guillén J. A., Ávila-Orta C. A., Rodríguez-Fernández O. S. (2018) Synthesis at room atmosphere conditions of phosphorescent emitter SrAl2O4:Eu,Dy. Ceramics International, 44, 11, 12789-12796. doi: 10.1016/j.ceramint.2018.04.085
Hu X., Yang H., Guo T., Shu D., Shan W., Li G., Guo D. (2018) Preparation and properties of Eu and Dy co-doped strontium aluminate long afterglow nanomaterials. Ceramics International, 44, 7, 7535-7544. doi: 10.1016/j.ceramint.2018.01.157
Jia W., Yuan H., Lu L., Liu H., Yen W. M. (1998) Phosphorescent dynamics in SrAl2O4: Eu2+, Dy3+ single crystal fibers. Journal of Luminescence, 76–77, 424–428. doi: 10.1016/S0022-2313(97)00230-5
Karakaş C. (2010) Synthesis Of Strontium Aluminates Phosphorescence Material By Modified Sol-gel Process, MSc Thesis, Istanbul Technical University, Istanbul, Turkey.
Kim B. J., Hasan Z., Kim J. K. (2013) Synthesis and characterization of long persistence Sr4Al14O25:Eu2+, Dy3+phosphor prepared by combustion method. Journal of Ceramic Processing Research, 14, 601–605.
Lai T. T., Chang C., Yang C. Y., Das S., Lu C. H. (2013) Influence of Bi2O3 flux in the structural and photoluminescence properties of SrAl2O4:Eu2+ phosphors. Ceramics International, 39, 159–163. doi: 10.1016/j.ceramint.2012.06.004
Lin Y., Tang Z., Zhang Z. (2001) Preparation of Long-Afterglow Sr4Al14O25-Based Luminescent Material and Its Optical Properties. Materials Letters, 51, 14–18. doi: 10.1016/S0167-577X(01)00257-9
Lin Y., Zhang Z., Tang Z., Zhang J., Zheng Z., Lu X. (2001) The characterization and mechanism of long afterglow in alkaline earth aluminates phosphors co-doped by Eu2O3 and Dy2O3. Materials Chemistry and Physics, 70, 156–159. doi: 10.1016/S0254- 0584(00)00500-9
Liu Y., Lei B., Shi C. (2005) Luminescent properties of a white afterglow phosphor CdSiO3:Dy3+. Chemistry of Materials, 17, 2108– 2113. doi: 10.1021/cm0496422
Lu Y., Li Y., Xiong Y., Wang D., Yin Q. (2004) SrAl2O4: Eu2+, Dy3+ phosphors derived from a new sol–gel route. Microelectronics Journal, 35, 379–382, 2004. doi: 10.1016/S0026-2692(03)00250-7
Luitel H. N. (2010) Preparation and Properties of Long Persistent Sr4Al14O25 Phosphors Activated by Rare Earth Metal Ions, PhD Thesis, Saga University, Saha.
Luitel H. N., Watari T., Chand R., Torikai T., Yada M. (2013) Giant improvement on the afterglow of Sr4Al14O25: Eu2+, Dy3+ phosphor by systematic investigation on various parameters. Journal of Materials, 1-10. doi: 10.1155/2013/613090
Nag A., Kutty T. R. N. (2003) Role of B2O3 on the phase stability and long phosphorescence of SrAl2O4:Eu, Dy. Journal of Alloys and Compounds, 354, 221–231. doi: 10.1016/S0925-8388(03)00009-4
Nag A., Kutty T. R. N. (2004) The mechanism of long phosphorescence of SrAl2− xBxO4 (0< x< 0.2) and Sr4Al14− xBxO25 (0.1< x< 0.4) co-doped with Eu2+ and Dy3+. Materials Research Bulletin, 39, 331–342. doi: 10.1016/j.materresbull.2003.11.007
Nakauchi D., Okada G., Masanori K., Kawano N., Kawaguchi N., Yanagida T. (2018) Photoluminescence and scintillation properties of Eu-doped strontium aluminate crystals. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 435, 273-277. doi: 10.1016/j.nimb.2018.01.007
Niittykoski J., Aitasalo T., Hölsä J., Jungner H., Lastusaari M., Parkkinen M., Tukia M. (2004) Effect of boron substitution on the preparation and luminescence of Eu2+ doped strontium aluminates. Journal of Alloys and Compounds, 374, 108–111. doi: 10.1016/j.jallcom.2003.11.078
Rojas-Hernandez R. E., Rubio-Marcos F., Rodriguez M. A., Fernandez J. F. (2018) Long lasting phosphors: SrAl2O4:Eu, Dy as the most studied material. Renewable and Sustainable Energy Reviews, 81, 2759-277. doi: 10.1016/j.rser.2017.06.081
Sasaki T., Fukushima J., Hayashi Y., Takizawa H. (2018) Synthesis and photoluminescence properties of a novel Sr2Al6O11:Mn4+ red phosphor prepared with a B2O3 flux. Journal of Luminescence, 194, 446-451. doi: 10.1016/j.jlumin.2017.10.076
Shafia E., Bodaghi M., Esposito S., Aghaei A. (2014) A critical role of pH in the combustion synthesis of nano-sized SrAl 2 O 4: Eu 2+, Dy 3+ phosphor. Ceramics International 40, 4697–4706. doi: 10.1016/j.ceramint.2013.09.011
Smets S., Rutten J., Hoeks G., Verlijsdonk J. (1989) 2SrO · 3Al2O3 : Eu2 + and 1.29 (Ba , Ca) O , 6Al2O3 : Eu2 + Two New Blue‐ Emitting Phosphors. Journal of The Electrochemical Society, 136, 2119–2123. doi: 10.1149/1.2097210
Thompson N. (2007) An Approach to the Synthesis of Strontium Aluminate Based Nanophosphors, PhD Thesis, RMIT University, Melbourne.
Xiao Q., Xiao L., Liu Y., Chen X., Li Y. (2010) Synthesis and Luminescence Properties of Needle-Like SrAl2O4: Eu, Dy Phosphor via a Hydrothermal Co-Precipitation Method. Journal of Physics and Chemistry of Solids, 71, 1026–1030. doi: 10.1016/j.jpcs.2010.04.017
Yadav R. S., Rai S. B. (2018) Corrigendum to: Frequency upconversion and downshifting emissions in solution combustion derived Yb3+, Pr3+ co-doped strontium aluminate nano-phosphor: A multi-modal phosphor. Journal of Luminescence, 199, 528. doi: 10.1016/j.jlumin.2018.03.028