Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na


Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników
2007 | 5 | 4 | 558-569
Tytuł artykułu

Luminescent properties of Li2 (Ca0.99, Eu0.01) SiO4: B3+ particles as a potential bluish green phosphor for ultraviolet light-emitting diodes

Treść / Zawartość
Warianty tytułu
Języki publikacji
In 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.

Opis fizyczny
  • Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, College of Chemistry and Material Science, South Central University for Nationalities, Wuhan, 430074, PR China
  • Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, College of Chemistry and Material Science, South Central University for Nationalities, Wuhan, 430074, PR China,
  • [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.[Crossref]
  • [5] E.F. Schubert and J.K. Kim: “Solid-State Light Sources Getting Smart”, Science, Vol. 308, (2005), pp. 1274–1278.[Crossref]
  • [6] J.K. Park, M.A. Lim, C.H. Kim, H.D. Park, J.T. Park and S.Y. Choi: “White light-emitting diodes of GaN-based Sr2SiO4: Eu and the luminescent properties”, Appl. Phys. Lett, Vol. 82, (2003), pp. 683–685.[Crossref]
  • [7] J.K. Park, C.H. Kim, S.H. Park, H.D. Park and S.Y. Choi: “Application of strontium silicate yellow phosphor for white light-emitting diodes”, Appl. Phys. Lett, Vol. 84, (2004), p. 1648.
  • [8] J.S. Kim, J.K. Kang, P.E. Jeon, J.C. Chol, H.L. Park and T.W. Kim: “GaN-based white-light-emitting diodes fabricated with a mixture of Ba3MgSi2O8: Eu2+ and Sr2SiO4: Eu2+ phosphors”, Jpn. J. Appl. Phys., Vol. 43, (2004), pp. 989–992.[Crossref]
  • [9] J.S. Kim, P.E. Jeon, Y.H. Park, J.C. Choi and H.L. Park: “White-light generation through ultraviolet-emitting diode and white-emitting phosphor”, Appl. Phys. Lett, Vol. 85, (2004), p. 3696.[Crossref]
  • [10] M. Pardha Saradhi and U.V. Varadaraju: “Photluminescence studies on Eu2+-activated Li2SrSiO4-a potential orange-yellow phosphor for solid-state lighting”, Chem. Mater, Vol. 18, (2006), pp. 5267–5272.[Crossref]
  • [11] Y. Narukawa, I. Niki, K. Izuno, M. Yamada and Y. Mukai: “Phosphor-Conversion White Light Emitting Diode Using InGaN Near-Ultraviolet Chip”, Jpn. J. Appl. Phys., Vol. 41, (2002), pp. 371–373.[Crossref]
  • [12] A.M. Srivastava, H.A. Comanzo and H.A. Comanzo: “Phosphors for down converting ultraviolet light of LEDs to blue-green light”, U.S. Patent. No. 6, 466, 135, (2002), pp. 12.
  • [13] J. Liu, J.Y. Sun and C.S. Shi: “A new luminescent material: Li2CaSiO4: Eu2+”, Mater. Lett, Vol. 60, (2006), pp. 2830–2833.[Crossref]
  • [14] Z.C. Wu, J.X. Shi, J. Wang, M.L. Gong and Q. Su: “A novel blue-emitting phosphor LiSrPO4: Eu2+”, J. Solid State Chem., Vol. 179, (2006) pp. 2356–2360.[Crossref]
  • [15] M. Veith, S. Mthur, A. Kareiva, M. Jilavi, M. Zimmer and V. Huch: “Low temperature synthesis of nanocrystalline Y3Al5O12 (YAG) and Ce-doped Y3Al5O12 via different sol-gel methods”, J. Mater. Chem., Vol. 9, (1999) pp. 3069–3079.[Crossref]
  • [16] T.M. Chen, S.C. Chen and C.J. Yu: “Garnet phosphor nanoparticles derived from oxalate coprecipitation”, J. Solid State Chem., Vol. 144, (1999), pp. 437–441.[Crossref]
  • [17] K.Y. Jung, H.W. Lee and H.K. Jung: “Luminescent properties of (Sr, Zn)Al2O4: Eu2+, B3+ particles as a potential green phosphor for UV LEDs”, Chem. Mater, Vol. 18, (2006), pp. 2249–2255.[Crossref]
  • [18] Y. Xinbin, Z. Chunlei, H. Xionghong, P. Zifei and Y. Shiping: “The influence of some processing conditions on luminescence of SrAl2O4: Eu2+ nanoparticles produced by combustion method”, Mater. Lett, Vol. 58, (2004), pp. 1087–1091.[Crossref]
  • [19] J.A. Gard and A.R. West: “Preparation and crystal structure of Li2CaSiO4 and isostructural Li2CaGeO4”, J. Solid State Chem., Vol. 7, (1973), p. 422.[Crossref]
  • [20] J.J. Kingsley, K.C. Patil: “A Novel Combustion Process for the Synthesis of Fine Particle alpha-Alumina and Related Oxide Materials”, Mater. Lett, Vol. 6, (1988), pp. 427–432.[Crossref]
  • [21] H.E. Bergan and L.B. Hockessin: “Ceramic dielectric compositions and method for improving sinterability”, United States: 5, 011, 804, Apr. 30, 1991.
  • [22] J.M. Sun, T. Dekorsy, W. Skorupa, A. Mücklich, B. Schmidt and M. Helm: “Efficient silicon light emitting diodes by boron implantation: the mechanism”, Opt. Mater, Vol. 27, (2005), pp. 1041–1045.[Crossref]
  • [23] W. Jia, D. Jia, T. Rodriguez, D.R. Evans, R.S. Meltzer and W.M. Yen: “UV excitation and trapping centers in CaTiO3: Pr3+”, J. Lumin., Vol. 119/120, (2006), pp. 13–18.[Crossref]
  • [24] A. Nag and T.R.N. Kutty: “Role of B2O3 on the phase stability and long phosphorescence of SrAl2O4: Eu, Dy”, J. Alloys Compd., Vol. 354, (2003), pp. 221–231.[Crossref]
  • [25] J.S. Duk, P.J. Kyu and L.S. Hyuk: “Photoluminescence properties of Eu2+ activated Sr3SiO5”, J. Mater. Sci., Vol. 41, (2006), pp. 3139–3141.[Crossref]
  • [26] P. Dorenbos: “Energy of the first 4f 7 → 4f 6 5d transition of Eu2+ in inorganic compounds”, J. Lumin., Vol. 104, (2003). pp. 239–260.[Crossref]
Typ dokumentu
Identyfikator YADDA
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.