Luminescence properties of Yb-doped Ca-α-SiAlON phosphors with composition of Ca1−xYbxSi12−(m+n)Alm+nOnN16−n were investigated by using cathodoluminescence (CL). The ratio of Yb to Ca was kept constant while the host lattice was changed by replacing m+n(Si–N) bonds with m(Al–N) and n(Al–O) bonds. The luminescence of these phosphors consists of three peaks in the ultraviolet (UV), green (VIS), and infrared (IR) regions, which are attributed to the emissions from secondary phases, Yb2+ and Yb3+, respectively. The UV emission depends on the Si/Al ratio: the UV peak is centered at 310 nm for the Si-rich mix and at 360 nm for the Al-rich mix. We have found that Yb exists in the divalent state in α-SiAlON and in the trivalent state in the secondary phases.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
Tax calculation will be finalised during checkout.
S. Hampshire, H.K. Park, D.P. Thompson K.H. Jack: α-Sialon. Nature 274, 31 1978
J.W.H. Krevel, J.W.T. Rutten, H. Mandal, H.T. Hintzen R. Metselaar: Luminescence properties of terbium-, cerium-, or europium-doped α-SiAlON materials. J. Solid State Chem. 165, 19 2002
R-J. Xie, M. Mitomo, K. Uheda, F.F. Xu Y. Akimune: Preparation and luminescence spectra of calcium- and rare-earth (R = Eu, Tb, and Pr)-codoped α-SiAlON ceramics. J. Am. Ceram. Soc. 85, 1229 2002
R-J. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto N. Ohashi: Photoluminescence of cerium-doped α-SiAlON materials. J. Am. Ceram. Soc. 87, 1368 2004
R-J. Xie, N. Hirosaki, K. Sakuma, Y. Yamamoto M. Mitomo: Eu2+-doped Ca-α-SiAlON: A yellow phosphor for white light-emitting diodes. Appl. Phys. Lett. 84, 5404 2004
R-J. Xie, N. Hirosaki, M. Mitomo, Y. Yamamoto, T. Suehiro K. Sakuma: Optical properties of Eu2+ in α-SiAlON. J. Phys. Chem. B108, 12027 2004
K. Sakuma, K. Omichi, N. Kimura, M. Ohashi, D. Tanaka, N. Hirosaki, Y. Yamamoto, R-J. Xie T. Suehiro: Warm-white light-emitting diode with yellowish orange SiAlON ceramic phosphor. Opt. Lett. 29, 2001 2004
R-J. Xie, N. Hirosaki, M. Mitomo, K. Takahashi K. Sakuma: Highly efficient white-light-emitting diodes fabricated with short-wavelength yellow oxynitride phosphors. Appl. Phys. Lett. 88, 101104 2006
B.S.B. Karunaratne, R.J. Lumby M.H. Lewis: Rare-earth-doped α′-Sialon ceramics with novel optical properties. J. Mater. Res. 11, 2790 1996
Z. Shen, M. Nygren U. Halenius: Absorption spectra of rare-earth-doped α-sialon ceramics. J. Mater. Sci. Lett. 16, 263 1997
O.J. Rubio: Doubly-valent rare-earth ions in halide crystals. J. Phys. Chem. Solids 52, 101 1991
B. Dierre, X.L. Yuan, N. Hirosaki, R.J. Xie T. Sekiguchi: Luminescence properties of Ca- and Yb-codoped SiAlON phosphors. Mater. Sci. Eng., B: Solid 146, 80 2008
J.Q. Hu, Y. Bando, J.H. Zhan, Y.B. Li T. Sekiguchi: Two-dimensional micrometer-sized single-crystalline ZnO thin nanosheets. Appl. Phys. Lett. 83, 4414 2003
T. Sekiguchi, J.Q. Hu Y. Bando: Cathodoluminescence study of one-dimensional free-standing widegap-semiconductor nanostructures: GaN nanotubes, Si3N4 nanobelts and ZnS/Si nanowires. J. Electron Microsc. (Tokyo) 53, 203 2004
X.L. Yuan, B.P. Zhang, J. Niitsuma T. Sekiguchi: Cathodoluminescence characterization of ZnO nanotubes grown by MOCVD on sapphire substrate. Mater. Sci. Semicon. Proc. 9, 146 2006
R-J. Xie, N. Hirosaki, M. Mitomo, K. Uheda, T. Suehiro, X. Xu, Y. Yamamoto T. Sekiguchi: Strong green emission from α-SiAlON activated by divalent ytterbium under blue light irradiation. J. Phys. Chem. B 109, 9490 2005
C.L. Hewett, Y.B. Cheng, B.C. Muddle M.B. Trigg: Thermal stability of calcium α-SiAlON ceramics. J. Eur. Ceram. Soc. 18, 417 1998
H. Mandal D.P. Thompson: α→β Sialon transformation in calcium-containing α-SiAlON ceramics. J. Eur. Ceram. Soc. 19, 543 1999
T. Sekiguchi, X.L. Yuan J. Niitsuma: Fabrication of UHV-SEM equipped with Auger and cathodoluminescence systems and its application to the study of semiconductor nanostructures. Scanning 27, 103 2005
S. Achour, A. Harabi N. Tabet: Cathodoluminescence dependence upon irradiation time. Mater. Sci. Eng., B 42, 289 1996
H.C. Swart, J.J. Terblans, E. Coetsee, O.M. Ntwaeaborwa, M.S. Dhlamini, S. Nieuwoudt P.H. Holloway: Review on electron stimulated surface chemical reaction mechanism for phosphor degradation. J. Vac. Sci. Technol., A 25, 917 2007
A.J. Kenyon: Recent developments in rare-earth doped materials for optoelectronics. Prog. Quant. Electron. 26, 225 2002
L.G. Zhang, H. Jin, W.Y. Yang, Z.P. Xie, H.H. Miao L.N. An: Optical properties of single-crystalline alpha-Si3N4 nanobelts. Appl. Phys. Lett. 86, 061908 2005
G.A. Slack, L.J. Schowalter, D. Morelli, J.A. Freitas Jr.: Some effects of oxygen impurities on AlN and GaN. J. Cryst. Growth 246, 287 2002
The authors are grateful to F. Fabbri for his guidance and stimulating discussions. The authors also thank Dr. X.S. Fang and Dr. U.K. Gautam for their help in the electron microscopy analysis.
About this article
Cite this article
Dierre, B., Yuan, X., Hirosaki, N. et al. Luminescence distribution of Yb-doped Ca-α-SiAlON phosphors. Journal of Materials Research 23, 1701–1705 (2008). https://doi.org/10.1557/JMR.2008.0208