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Influence of sample thickness and concentration of Ce dopant on the optical properties of YAG:Ce ceramic phosphors for white LEDs

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Abstract

Translucent, polycrystalline YAG:Ce disks with 0.1, 0.5, and 1 mol% concentrations of cerium as well as different resulting thicknesses of 0.5 and 0.8 mm were prepared by reaction sintering of yttria, alumina, and cerium oxide under vacuum at a temperature of 1800 °C. The obtained samples displayed a microstructure with a Y3Al5O12 main phase interrupted by an intended scattering phase of alumina. Furthermore, the total forward transmittance was between 75 and 78% with the typical absorption bands of cerium at wavelengths of 330 and 460 nm. Phosphor conversion light-emitting diodes (LEDs) with 0.88 W power dissipation have been prepared from these YAG:Ce ceramic disks as converters and blue 455 nm LED chips for excitation. Their color coordinates in the CIE (Commission Internationale de l’Eclairage) diagram determined by spectral photometry depend on the concentration of the Ce dopant and the ceramic converter thickness. The highest luminous flux of 276 lm with an efficiency of 76.6 lm/W was measured for a converter with 0.5 mol% dopant concentration and 0.8 mm thickness emitting a yellowish white light.

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References

  1. N. Holonyak, Jr. and S.F. Bevacqua: Coherent (visible) light emission from Ga(As1−xPx) junctions. Appl. Phys. Lett. 1(4), 82 (1962).

    Article  CAS  Google Scholar 

  2. S. Nakamura, G. Fasol, and S.J. Pearton: The Blue Laser Diode: The Complete Story, 2nd ed.; Springer: Berlin, Germany, 2000; p. 2.

    Book  Google Scholar 

  3. P. Schlotter, R. Schmidt, and J. Schneider: Luminescence or blue light emitting diodes. Appl. Phys. A 64, 417 (1997).

    Article  CAS  Google Scholar 

  4. S. Nishiura, S. Tanabe, K. Fujioka, Y. Fujimoto, and M. Nakatsuka: Preparation and optical properties of transparent Ce:YAG ceramics for high power white LED. IOP Conf. Ser.: Mater. Sci. Eng. 1, 012031 (2009).

    Article  Google Scholar 

  5. H. Bechtel, P.J. Schmidt, A. Tücks, M. Heidemann, D. Chamberlin, R. Mueller-Mach, G.O. Mueller, and O. Shchekin: Fully phosphor-converted LEDs with Lumiramic phosphor technology. In Proceedings of SPIE, Tenth International Conference on Solid State Lighting, Vol. 7784, 2010; p. 77840W.

    Article  Google Scholar 

  6. A. Ikesue, I. Furusato, and K. Kamata: Fabrication of polycrystalline, transparent YAG ceramics by a solid-state reaction method. J. Am. Ceram. Soc. 78(11), 225 (1995).

    Article  CAS  Google Scholar 

  7. A. Ikesue and Y.L. Aung: Synthesis and performance of advanced ceramic lasers. J. Am. Ceram. Soc. 89(6), 1936 (2006).

    Article  CAS  Google Scholar 

  8. M.R. Krames, O.B. Shchekin, R. Mueller-Mach, G.O. Mueller, L. Zhou, G. Harbers, and M.G. Craford: Status and future of high-power light-emitting diodes for solid-state lighting. J. Disp. Technol. 3(2), 160 (2007).

    Article  CAS  Google Scholar 

  9. M. Raukas, J. Kelso, Y. Zheng, K. Bergenek, D. Eisert, A. Linkov, and F. Jermann: Ceramic phosphors for light conversion in LEDs. ECS J. Solid State Sci. Technol. 2(2), R3168 (2013).

    Article  CAS  Google Scholar 

  10. S. Nishiura, S. Tanabe, K. Fujioka, and Y. Fujimoto: Properties of transparent Ce:YAG ceramic phosphors for white LED. Opt. Mater. 33, 688 (2011).

    Article  CAS  Google Scholar 

  11. BrukerAXS and DIFFRACPlus TOPAS: TOPAS 4.2 User Manual (Bruker-AXS GmbH, Karlsruhe, Germany, 2008).

    Google Scholar 

  12. A. Krell, T. Hutzler, and J. Klimke: Transmission physics and consequences for materials selection, manufacturing, and applications. J. Eur. Ceram. Soc. 29, 207 (2009).

    Article  CAS  Google Scholar 

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ACKNOWLEDGMENTS

The authors would like to thank S. Liu for the spectral photometry measurements, R. Schmidt for technical assistance in LED preparation and Th. Passow and J. Wagner for helpful comments and discussions. This work was supported by Fraunhofer internal program Attract (Grant No. 692077).

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Authors and Affiliations

  1. Department of Precursor-Derived Ceramics and Composites, Fraunhofer Institute for Ceramic Technologies and Systems (IKTS), Dresden, 01277, Germany

    Katja Waetzig & Isabel Kinski

  2. Business Unit Semiconductor Lasers and LEDs, Fraunhofer Institute for Applied Solid State Physics (IAF), Freiburg, D-79108, Germany

    Michael Kunzer

Authors
  1. Katja Waetzig
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  2. Michael Kunzer
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  3. Isabel Kinski
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Correspondence to Katja Waetzig.

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Waetzig, K., Kunzer, M. & Kinski, I. Influence of sample thickness and concentration of Ce dopant on the optical properties of YAG:Ce ceramic phosphors for white LEDs. Journal of Materials Research 29, 2318–2324 (2014). https://doi.org/10.1557/jmr.2014.229

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  • DOI: https://doi.org/10.1557/jmr.2014.229

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