Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Photoluminescence of Al2O3:xCr2O3 Solid Solution and Application as the Additive for Improving CRI of Red Phosphor

Al2O3:xCr2O3 고용상의 발광특성과 적색형광체의 연색성 향상을 위한 첨가제로의 응용

  • Chae, Ki-Woong (Department of Materials Science and Engineering, Hoseo University) ;
  • Cheon, Chae-Il (Department of Materials Science and Engineering, Hoseo University) ;
  • Kim, Jeong-Seog (Department of BK21 Semiconductor & Display Engineering, Hoseo University)
  • 채기웅 (호서대학교 신소재공학과) ;
  • 천채일 (호서대학교 신소재공학과) ;
  • 김정석 (호서대학교 BK21 대학원 반도체디스플레이공학과)
  • Published : 2010.03.31
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Abstract

In this article photoluminescence of the $Al_2O_3:xCr_2O_3$ solid solutions prepared by solid state reaction method are represented. The effect of $Cr_2O_3$-activator concentration and heat treatment time on the PL characteristics have been discussed in conjunction with microstructure of phosphor samples. The $Al_2O_3:xCr_2O_3$ phosphors show the highest PL intensity at x=0.003 mole when the samples are reacted at $1600^{\circ}C$ for 5 h. The PL emission and absorption spectra show the maximum peaks at 698 nm and at 398 nm respectively. The CIE color coordinate is (x=0.646, y=0.316) at 0.003 mole $Cr_2O_3$, which value is very close to the NTSC coordinate of red color. This characteristic feature of $Al_2O_3:xCr_2O_3$ has been applied for an additive to improve the color characteristic of other red phosphor $LiEuW_2O_8$ which has a relatively poor color purity with an emission peak centered at 615 nm and with a CIE coordinate (x=0.530, y=0.280). The $Al_2O_3:0.003Cr_2O_3$ phosphor has been mixed with the $LiEuW_2O_8$ phosphor powder and the PL characteristics and CIE color coordinates are characterized. The $Al_2O_3:xCr_2O_3$ phosphor was found effective for improving the CRI (color rendering index) of $LiEuW_2O_8$ phosphor.

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References

  1. S. Nakamura, T. Mukai, and M. Senoh, “High-brightness InGaN/AlGaN Double-heterostructure Blue-green-lightemitting Diodes,” J. Appl. Phys., 76 [12] 8189-91 (1994). https://doi.org/10.1063/1.357872
  2. S. Nakamura and G. Fasol, “The Blue Laser Diode,” pp. 216-221, Springer, Berlin, 1996.
  3. C. H. Lu, H.C. Hong, and R. Jagannathan, “Sol-gel Synthesis and Photoluminescent Properties of Cerium-ion Doped Yttrium Aluminium Garnet Powders,” J. Mater. Chem., 12 2525-30 (2002). https://doi.org/10.1039/b200776m
  4. H. S. Jang, W. B. Im, D. C. Lee, D. Y. Jeon, and S. S. Kim, “Enhancement of Red Spectral Emission Intensity of TEX>$Y_3Al_5O_{12}:Ce^{3+}$ Phosphor Via Pr Co-doping and Tb Substitution for the Application to White LEDs,” J. Lumin., 126 371-77 (2007). https://doi.org/10.1016/j.jlumin.2006.08.093
  5. B. Henderson and Ralph H. Bartram, “Crystal Field Engineering of Solid State Laser Materials,” Chap. 3, pp. 306 in Optical crystals, Cambridge University, Press, 2000.
  6. G. Blasse and B. C. Grabmaier, “Luminescent Materials,” pp 51-2, Springer, Berlin, 1994.
  7. K. J. McCarthy, J. G. Lopez, F. M. Hernandez, B. Zurro, A. Baciero, and M. A. Respaldiza, “The Response of a Chromium Doped Alumina Screen to KeV and MeV,” J. Nucl. Mater., 321 78-83 (2003). https://doi.org/10.1016/S0022-3115(03)00208-3
  8. H. Yu and D. R. Clarke, “Effect of Co-doping on the R-line Luminescence of $Cr^{3+}$-Doped Alumina,” J. Am. Ceram. Soc., 85 1966-70 (2002). https://doi.org/10.1111/j.1151-2916.2002.tb00389.x
  9. C. C. Torardi, C. Page, and L. H. Brixner, “Structure and Luminescence of Some $CsLnW_2O_8$ Compounds,” J. Sol. St. Chem., 69 171-78 (1987). https://doi.org/10.1016/0022-4596(87)90023-5
  10. F. Shi, J. Meng, Y. Ren, and Q. Su, “Structure, Luminescence and Magnetic Properties of ,TEX>$AgLnW_2O_8$ (Ln = Eu, Gd,Tb, and Dy) Compounds,” J. Phys. Chem. Sol., 59 105-10 (1998). https://doi.org/10.1016/S0022-3697(97)00148-0
  11. K. S. Hwang, S. Hwangbo, and J. T. Kim, “Sol-gel Synthesis of Red-emotting $LiEuW_2O_8$ Powder as a Near-ultraviolet Convertible Phosphor,” Ceram. Inter., 35 2517-19 (2009). https://doi.org/10.1016/j.ceramint.2008.12.004
  12. S. P. Feofilov, A. A. Kaplyanskii, and R. I. Zakharchenya, “Luminescence and Laser Spectroscopy of Highly Poros $R-Al_2O_3$ Doped with 3d- and 4f-ions: Effect of Spatial Phonon Confinement,” J. Lumin., 72-4 41-2 (1997). https://doi.org/10.1016/S0022-2313(96)00223-2

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