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http://dx.doi.org/10.4313/TEEM.2014.15.2.69

Improved White Light Emitting Diode Characteristics by Coating GdAG:Ce Phosphor  

Joshi, Charusheela (Department of Physics, Shri Ramdeobaba College of Engineering and Management)
Yadav, Pooja (Department of Physics, Shri Ramdeobaba College of Engineering and Management)
Moharil, S.V. (Department of Physics, R.T.M. Nagpur University)
Publication Information
Transactions on Electrical and Electronic Materials / v.15, no.2, 2014 , pp. 69-72 More about this Journal
Abstract
White LEDs, based on blue LED chips coated with a yellow emitting phosphor (YAG:Ce), have several disadvantages. In this paper, we report the improvement in CRI [Color Rendition Index] using $GdAl_5O_{12}:Ce$ (GdAG:Ce) and related phosphors for blue LEDs. A modified combustion synthesis route using mixed fuel was used for synthesis route. By using this procedure, we formed the desired compounds in a single step. LEDs were then fabricated by coating the blue LED chips (CREE 470 nm, 300 micron) with the GdAG:Ce phosphor dispersed in epoxy resin. The CRI typically between 65~70 for the YAG:Ce based LED was improved to 87 for LEDs fabricated from the Gd(Al,Ga)G phosphors.
Keywords
Solid state lighting; White LED; Phosphors; Combustion synthesis;
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1 M.Khizar, Z.Y.Fan, K.H.Kim, J.Y.Lin, H.X.Jiang, Appl. Phys.Lett., 86, 173504 (2005) [DOI: http://dx.doi.org/10.1063/1.1914960].   DOI   ScienceOn
2 L. Chen, C. C. Lin, C. W. Yeh, and R. S. Liu, Materials, 3, 2172 (2010).   DOI
3 R. J.Xie, N.Hirosaki, Y. Li, and T. Takeda, Materials, 3, 3777 (2010).   DOI
4 S. Ye, F. Xiao, Y.X. Pan, Y.Y. Ma, Q.Y. Zhang, Mater. Sci. Engg. R, 71, 1 (2010) [DOI: http://dx.doi.org/10.1016/j.mser.2010.07.001].   DOI   ScienceOn
5 Y. Shimizu, K. Sakano, Y. Noguchi, and T. Moriguchi., U. S. Patent; 5, 998, 925 (1999).
6 T. Maeda, S. Oshio, K.Iwama, H.Kitahara, T. Ikeda, H. Kamei, Y.Hanada, and K.Sakanoue,Patent US, 7,422,504 (2008).
7 P. F. Smet, A. B. Parmentier, and D.Poelman, J. Electrochem. Soc., 158, R037 (2011) [DOI: http://dx.doi.org/10.1149/1.3568524].   DOI   ScienceOn
8 J. Ueda, S. Tanabe, and T. Nakanishi, J. Appl. Phys., 110, 053102 (2011) [DOI: http://dx.doi.org/10.1063/1.3632069].   DOI
9 T. Y. Tien, E. F. Gibbons, R. G. DeLosh, P. J. Zacmanidis, D. E. Smith, and H. L. Stadler J. Electrochem. Soc., 120, 278 (1973) [DOI: http://dx.doi.org/10.1149/1.2403436].   DOI
10 S. UysalSatilmis, A. Ege, M. Ayvacikli, A. Khatab, E. Ekdal, E.J. Popovici, M. Henini, and N. Can, Opt. Mater., 34, 1921(2012) [DOI: http://dx.doi.org/10.1016/j.optmat.2012.06.002].   DOI
11 A.Latynina, M. Watanabe, D. Inomata, K. Aoki, Y. Sugahara, E. G.. V?llora, and K.Shimamura, J.Alloys.Compds., 553, 89(2013) [DOI: http://dx.doi.org/10.1016/j.jallcom.2012.11.096].   DOI
12 Y. S. Lin, R. S. Liu, and B. M. Cheng, J. Electrochem. Soc., 152, J41 (2005) [DOI: http://dx.doi.org/10.1149/1.1896307].   DOI   ScienceOn
13 S. Fujita, A. Sakamoto, and S. Tanabe, IEEE J. Sel. Top. Quantum. Electron., 14, 1387 (2008) [DOI: http://dx.doi.org/10.1109/JSTQE.2008.920285].   DOI   ScienceOn
14 V.P. Dotsenko, I.V. Berezovskaya, E.V. Zubar, N.P. Efryushina, N.I. Poletaev, Y. A. Doroshenko, G..B. Stryganyuk, and A.S.Voloshinovskii, J.Alloys.Compds., 550, 159 (2013) [DOI: http://dx.doi.org/10.1016/j.jallcom.2012.09.053].   DOI
15 R. Hansel, S. Allison, and G. Walker, J. Mater. Sci., 45, 146 (2010) [DOI: http://dx.doi.org/10.1007/s10853-009-3906-9].   DOI
16 K. Kamada, T.Yanagida, J. Pejchal, M.Nikl, T. Endo, K.Tsutumi, Y. Fujimoto, A.Fukabori, and A. Yoshikawa, J. Phys. D: Appl. Phys., 44, 505104(2011) [DOI: http://dx.doi.org/10.1088/0022-3727/44/50/505104].   DOI
17 P.Dorenbos and J.Lumin, 134, 310 (2013) [DOI: http://dx.doi.org/10.1016/j.jlumin.2012.08.028].   DOI
18 T. Han, S. Cao, L. Peng, D. Zhu, C. Zhao, M. Tu, and J. Zhang,Mat.Res.Bull., 47, 1618 (2012).
19 J.J. Kingsley, K. Suresh, and K.C. Patil, J. Mater. Sci., 25, 1305 (1990).   DOI
20 J.J.Kingsley, N. Manickam, and K.C. Patil, Bull. Mater. Sci., 13, 179 (1990) [DOI: http://dx.doi.org/10.1007/BF02744944].   DOI
21 V. Bachmann, C. Ronda, and A. Meijerink, Chem. Mater., 21, 2077 (2009) [DOI: http://dx.doi.org/10.1021/cm8030768].   DOI   ScienceOn
22 S. Nakamura and G.. Fasol, The Blue Laser Diode: GaN Based Light Emitters and Lasers(Heidelberg, Spring, 1997).
23 Y.Xu, L.Chen, Y.Li, G..Song, Y.Wang, W.Zhuang, and Z.Long, Appl. Phys.Lett., 92, 021129 (2008) [DOI: http://dx.doi.org/10.1063/1.2835703].   DOI