GÜN IŞIĞINDA UYARILABİLEN NANO FOSFORESANS BİLEŞİKLER Y.Doç.Dr. YUSUF ZİYA HALEFOĞLU ÇUKUROVA ÜNİVERSİTESİ ÖĞRETİM ÜYESİ 11 Nisan 2013 Adana Sanayi Odası Seyhan/Adana
AMAÇ Bu projede, son yıllarda üzerinde bir çok çalışma yapılan lantanit elementler kullanarak, (Eu, Dy, Gd, Nd, Pr, Pm, Sm, Tb, Ho, Tm, Yb, Y) farklı renklerde, doğal ışık ile uyarılabilen, uzun ışıma özellikli, fosforesans nano tanecikler sentezlenmiştir.
Uzun ışımalı fosforlar nedir? Uzun ışımalı fosforlar, çok uzun süre ışımaya veya fosforesansa sahip malzemelerdir. Uyarıma maruz kalan bir malzemeden elde edilen ışık yayınımı floresans olarak adlandırılır. Eğer bu ışıma uyarım kesildikten sonra da devam ediyorsa ve insan gözüyle algılanabiliyorsa fosforesans diye tanımlanır. Bunu kalıcı fosfor mekanizması ile açıklayabiliriz.
Kalıcı Fosfor Mekanizması Uzun ışıma; uyarılma sırasında tuzaklanan elektronlar ya da boşluklardan kaynaklanır. Kalıcı fosfor mekanizması
Yanma Yöntemi Sentez yöntemi olarak, diğer yöntemlere göre hızlı, kolay ve ucuz bir proses olan yanma yöntemi belirlenmiştir. 6Al(NO 3 ) 3 + 3Ca(NO 3 ) 2 +20CO(NH 2 ) 2 3CaAl 2 O 4 + 32N 2 +20CO 2 +40H 2 O Yanma reaksiyonunun fırın içerisinde gerçekleşmesi
SONUÇLAR Uyarılmadan önce Gün ışığında uyarıldıktan sonra
Literatür çalışmalarına bakıldığında, bu güne kadar sentezlenen fosforesans bileşiklerde, genellikle UV ışıma altında uyarılma sonucu, uzun ışıma meydana gelmektedir.
Bizim Farkımız Sentezlediğimiz bu bileşiklerin, hem UV, hem de gün ışığında uyarılma sonucu ışıma süreleri ölçülmüş, yapıya katılan lantanit elementlerin katkı oranlarına göre ışıma süreleri karşılaştırılmış ve sonuçlar değerlendirilmiştir.
Yapılan bu çalışmada, sentezlenen nano fosforların, literatürde büyük bir eksiklik olan, hiç uyarılmaya gerek duymadan, gün ışığında uyarılma ile uzun süreli ışıma yaptığı saptanmıştır.
Örnek Işımalar
Seramik yüzey üzerine, 1000 C de Uygulama
Seramik Yüzey Desen Uygulamaları
Kullanım Alanları Yol kenarlarında bulunan reflektörlerde Acil çıkışlarda Tekstil materyallerinde Teknolojik olarak bir çok alanda
KAYNAKLAR [1] Yen, M., W., Shionoya, S., Yamamoto, H., Fundamentals of phosphors, CRC Pres, Taylo& Francis Group, 2007. [2] Yen, W. M., Jia, W., Lu, L., Yuan, H., Long persistence blue phoshors, United States Patent, No: 6117362, 2000. [3] Clabau, F., Rocquefelte, X., Jobic, S., Deniard P., Whangbo M.-H., Garcia A., and Le Mercier T., Mechanism of phosphorescence appropriate for the long-lasting phosphors Eu2+-Doped SrAl2O4 with co-dopants Dy 3+ and B 3+, Chem. Mater., 17, 3904-3912, 2005. [4] G.Blasse,W.L.Wanmaker,J.W.Tervugt,A.Bril, Philip.Res.Repts. 23 (1968) 189. [5] K.Yamazaki, H.Nakabayashi, Y.Kotera, A.Ueno, J.Electrochem. Soc. 133 (1986) 657. [6] G.Blasse,A.Bril, Philip.Res.Repts. 23 (1968) 201. [7] Luitel, H. N., Preparation and properties of long persistent Sr4Al14O25 phosphors activated by rare earth metal ions, Saga University, Graduat School of Science and Engineering, Department of Energy and Materials Science, Doctor of Philosophy, 2010. [8] Suriyamurthy, N., Panigrahi, B.S., Investigations on luminescence of rare earths doped CaTiO3:Pr3+ phosphor, J. Lumin. 128 (11),1809, 2008. [9] Yuanhua, L., Zhongtai, Z., Tang, Z., Zhang, J., Zheng, Z., Lu, X., The characterization and mechanism of long afterglow in alkaline earth aluminates phosphors co-doped by Eu 2 O 3 and Dy 2 O 3, Materials Chemistry and Physics, 70, 156 159, 2001. [10] Yen, W. M. and Weber, M. J., Inorganic phosphors: compositions, preparation and optical properties, The CRC Press Laser and Optical Science and Technology Series, 9, 2004. [11] Yiqing, L., Yongxiang, L., Xiong, Y., Wang, D., Yin, Q., SrAl 2 O 4 :Eu 2+, Dy 3+ phosphors derived from a new sol gel route, Microelectronic Journal, 35, 379 382, 2004. [12] Wenyu L., Yingliang L., Pengfei A., Synthesis and luminescence properties of red long-lasting phosphor Y 2 O 2 S:Eu 3+,Mg 2+, Ti 4+ nanoparticles, Materials Chemistry and Physics 119, 52 56, (2010). [13] Mothudi, B.M., Ntwaeaborwa, O.M., Botha, J.R., Swart, H.C., Photoluminescence and phosphorescence properties of MAl 2 O 4 :Eu 2+, Dy 3+ (M=Ca,Ba,Sr) phosphors prepared at an initiating combustion temperature of 500 C, Physica B 404, 4440 4444, (2009).
[14] H., Ping, Cui, C., Wang, S., Influence of calcination temperature on luminescent properties of Sr 3 Al 2 O 6 :Eu 2+, Dy 3+ phosphors prepared by sol gel-combustion processing, Optical Materials 32, (2009). [15] Suriyamurthy, N., Panigrahi, B S., Luminescence studies during combustion synthesis of a long afterglow phosphor SrAl 14 O 25 : Eu 2+, Dy 3+, Indian Journal of Engineering and Materials Sciences Vol 16, 178-180 (2009). [16] Wei, R.P., Jua Z-H, Maa, J-X, Dong, Z, Zanga, Z-P, Liu, W-S., A novel white afterglow phosphorescent phosphor Ca 3 SnSi 2 O 9 :Dy 3+, Journal of Alloys and Compounds 486, L17 L20,(2009). [17] Zhu, Q., Li, J-G., Li, X., Sun X., Morphology-dependent crystallization and luminescence behavior of (Y, Eu)2O3 red phosphors, Acta Materialia 57, 5975 5985, (2009). [18] N. Lakshminarasimhan,1, U.V. Varadaraju, Role of crystallite size on the photoluminescence properties of SrIn2O4:Eu3+ phosphor synthesized by different methods, Journal of Solid State Chemistry 181 (2008). [19] N. Lakshminarasimhan U.V. Varadaraju -Luminescence and afterglow in Sr 2 SiO 4 :Eu 2+, RE 3+ [RE = Ce, Nd, Sm and Dy] phosphors - Role of co-dopants in search for afterglow, Materials Research Bulletin 43 (2008). [20] Hana S.D, Krishan C.S, Choa T.Y, Jakharb D., Hulmec J.P, Hana C.V, Kima J.D Chuna I.S, Gwaka J., Preparation and characterization of long persistence strontium aluminate phosphor, Journal of Luminescence 128, 301 305, (2008). [21] Huihui Z., Xinmu Z., Li Z., Xueping D.,Synthesis and luminescence properties of a novel red long lasting phosphor Y2O2S: Eu 3+, Si 4+, Zn 2+, Journal of Alloys and Compounds 460, 704 707, (2008). [22] Huihui Z., Xinmu Z., Li Z., Xueping D.,Chen D.,White-light long-lasting phosphor Sr 2 SiO 4 :Pr3+, Materials Letters 62, 2539 2541 (2008). [23] Pekgözlü I, Seyyidoglu S.,Tascıoglu S., Novel blue-emitting phosphor: BaAl 2 B 2 O 7 : Pb 2+, Journal of Luminescence 128, 1541 1543 (2008). [24] Manavbasi A., LaCombe J.C, A new blue-emitting phosphor, SrZnO 2 :Pb 2+, synthesized by the adipic acid templated sol gel route, Journal of Luminescence 128, 129 134 (2008). [25] XU Y., CHEN D.,Combustion synthesis and photoluminescence of Sr 2 MgSi 2 O 7 :Eu,Dy long lasting phosphor nanoparticles, Ceramics International 34, 2117 2120 (2008).
[26] Zhou Y., Ma Q., Lu M., Qian M., Lu M.,Combustion Synthesis and Photoluminescence Properties of YNbO4-Based Nanophosphors, Yuanyuan Zhou, Qian Ma, Mengkai Lu, Zifeng Qiu, and Aiyu Zhang, J. Phys. Chem. C, 112, 19901 19907, (2008). [27] Zhou R.S,Cui X.B.,Song J.F.,Xu Y.X.,Xu Q.J.,Wang T.G., Syntheses, structures and luminescence properties of lanthanide coordination polymers with helical character, Journal of Solid State Chemistry 181, 2099 2107 (2008). [28] Lou X.,Chen D., Synthesis of CaWO 4 :Eu 3+ phosphor powders via a combustion process and its optical properties, Materials Letters 62, 1681 1684 (2008). [29] Songa F., Donghuab C., Yuan Y., Synthesis of Sr 2 MgSi 2 O 7 :Eu, Dy and Sr 2 MgSi 2 O 7 :Eu, Dy, Nd by a modified solid-state reaction (combustion)and their luminescent properties, Journal of Alloys and Compounds 458, 564 568 (2008). [30] Zhao C., Chen D., Synthesis of CaAl 2 O 4 :Eu,Nd long persistent phosphor by combustion processes and its optical properties, Materials Letters 61, 3673 3675 (2007). [31] Liua B., Konga L., Shia C., White-light long-lasting phosphor Sr 2 MgSi 2 O 7 :Dy 3+, Journal of Luminescence,122 123, 121 124, (2007). [32] Singa V., Chakradharb R.P.S., Raoc J.L., Kima D.K., Synthesis, characterization, photoluminescence and EPR investigations of Mn doped MgAl 2 O 4 phosphors, Journal of Solid State Chemistry 180, 2067 2074, (2007). [33] Yin S., Chen D., Tang W., Combustion synthesis and luminescent properties of CaTiO 3 : Pr, Al persistent phosphors, Journal of Alloys and Compounds 441, 327 331, (2007). [34] Shia C., Fub Y., Liua B., Zhangb G., Chena Y., Qib Z., Luo X., The roles of Eu2+ and Dy3+ in the blue long-lasting phosphor Sr 2 MgSi 2 O 7 : Eu 2+, Dy 3+ Journal of Luminescence 122 123, 11 13, (2007). [35] Zhang P., Xua M., Zheng Z., Sunb B., Zhang Y., Rapid formation of red long afterglow phosphor Sr 3 Al 2 O 6 :Eu 2+, Dy 3+ by microwave irradiation, Materials Science and Engineering B 136, 159 164, (2007). [36] Shuanglong Y., Yunxia Y., Bin F., Guorong C., Effects of doping ions on afterglow propertiesof Y 2 O 2 S: Eu 2+ phosphors, Optical Materials 30, 535 538, (2007).
[37] Singh V., Zhu J.J., Bhide M.K., Natarajan V., Synthesis characterisation and luminescence investigations of Eu activated CaAl 2 O 4 phosphor, Optical Materials 30, 446 450 (2007). [38] Qiu Z., Zhou Y., Lu M., Zhang A., Ma Q., Combustion synthesis of long-persistent luminescent MAl 2 O 4 :Eu 2+, R 3+ (M = Sr, Ba, Ca, R = Dy, Nd and La) nanoparticles and luminescence mechanism research, Acta Materialia 55, 2615 2620, (2007). [39] Guanming Q., Hui W., Chen Y., Geng X., Shi S., Shi Z., Preparation of Orange-Red Long Afterglow Phosphors Y202S:Sm3+, Mg2+, Ti4+, Journal of Rare Earths Vol. 25, Suppl., Jua. p.i04, (2007). [40] Haian D., Gengshen L., Sun J., Preparation of Non-Grinding Long Afterglow SrAl 2 O 4 : Eu 2+, Dy 3+ Material by Microwave Combustion Method, Journal of Rare Earths 25, 19 22, (2007). [41] Yang Z., Li X., Liu C., Li X., Yong Y., Xu X., Li P., Co-Precipitation Synthesis and Spectral Characteristics of Long Afterglow Phosphor Y 2 0 2 S:Sm 3+, Mg 2+, Ti 4+, Journal of Rare Earths 25, 23-26, (2007). [42] Kuang J., Liu Y., Zhang J., White-light-emitting long-lasting phosphorescence in Dy 3+ -doped SrSiO 3, Journal of Solid State Chemistry 179, 266 269, (2006). [43] Liua B., Shia C., Qib Z., White-light long-lasting phosphorescence from Tb 3+ -activated Y 2 O 2 S phosphor, Journal of Physics and Chemistry of Solids 67, 1674 1677, (2006). [44] Ito Y., Komenoa A., Uematsu K., Toda K., Sato M., Luminescence properties of long-persistence silicate phosphors, Journal of Alloys and Compounds 408 412, 907 910, (2006). [45] Zhao C., Chen D., Yuan Y., Wu M., Synthesis of Sr 4 A l4 O 25 :Eu 2+,Dy 3+ phosphor nanometer powders by combustion processes and its optical properties, Materials Science and Engineering B 133, 200 204, (2006). [46] Zhang P., Xu M., Zheng Z., Sun B., Zhang Y., Microwave synthesis and characterization of new red long afterglow phosphor Sr 3 Al 2 O 6 :Eu, Trans. Nonferrous Met. Soc. China 16, s423-s425, (2006).