Author:
Yao Shanshan,Chen Donghua
Abstract
AbstractIn our study, the 1% mol Eu2+ doped Li2CaSiO4: B3+ phosphors were prepared by the combustion method as fluorescent material for ultraviolet, light-emitting diodes (UV-LEDs) used as a light source. The properties of Li2 (Ca0.99, Eu0.01) SiO4: B3+ phosphors with urea concentration, doping boric acid and a series of initiating combustion temperature were investigated. The crystallization and particle sizes of Li2 (Ca0.99, Eu0.01) SiO4: B3+ has been investigated by using powder X-ray diffraction (XRD) and transmission electron microscopy (TEM). Luminescence measurements showed that the phosphors can be efficiently excited by UV to the visible region, and exhibited bluish green light with a peak of 480 nm. The results showed that the boric acid was effective in improving the luminescence intensity of Li2 (Ca0.99, Eu0.01) SiO4: B3+ and the optimum molar ratio of boric acid to calcium nitrate was about 0.06. The optimized phosphors Li2 (Ca0.99, Eu0.01) SiO4: B0.063+ showed 180% improved emission intensity compared with that of the Li2 (Ca0.99, Eu0.01) SiO4 phosphors under ultraviolet (λex =287 nm) excitation.
Subject
General Physics and Astronomy
Reference26 articles.
1. S. Nakamura, S. Pearton and G. Fasol: The Blue Laser Diode, 2nd ed., Springer-Verlag, Berlin 2000.
2. N. Narendran, N. Maliyagoda, A. Bierman, R. Pysar and M. Overington: “Characterizing white LEDs for general illumination applications”, Proc SPIE Int Soc Opt Eng, Vol. 3938, (2000), p. 240.
3. M.G. Craford: “Visible LEDs: the trend toward high-powder emitters and remaining challenges for filid state lighting”, Proc SPIE Solid State Lighting II, Vol. 4776, (2002), pp. 1–8.
4. J.K. Sheu, C.H. Kuo, S.J. Chang, Y.K. Su, L.W. Wu, Y.C. Lin, J.M. Tsai, R.K. Wu and G.C. Chi: “White-Light emission from near UV InGaN-GaN LED Chip precoated with blue/green/red/ phosphors”, IEEE. Photonic. Technol. Lett, Vol. 15, (2003), p. 18.
5. E.F. Schubert and J.K. Kim: “Solid-State Light Sources Getting Smart”, Science, Vol. 308, (2005), pp. 1274–1278.
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献