Transparent Ce:Y3Al5O12 ceramic phosphors for white light-emitting diodes

We present our recent achievement of a transparent ceramic able to produce white light when directly combined with commercially available blue light emitting diodes. The photoluminescence properties of ceramic phosphor (Y1-xCex)(3)Al5O12 are studied as a function of doping fraction (x = 0.0005-0.0020). The emission color is tunable by variations of Ce3+ concentration and ceramic phosphor thickness. A maximum luminous efficacy exceeding 93 lm/W at a low correlated color temperature of similar to 4600 K is obtained, which is superior to samples made from commercial phosphor powders. Hence, the present transparent ceramic phosphor is expected to be an ideal candidate for generating white light. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4742896]

[1]  A. Sakamoto,et al.  Glass Ceramics for Solid State Lighting , 2012 .

[2]  Shengming Zhou,et al.  Structural and optical properties of YAG:Ce3+ phosphors by sol–gel combustion method , 2005 .

[3]  Setsuhisa Tanabe,et al.  Transparent Ce3+:GdYAG ceramic phosphors for white LED , 2011, OPTO.

[4]  C. Brecher,et al.  Kinetics of cerium emission in a YAG:Ce single crystal: the role of traps , 2000 .

[5]  A. Meijerink,et al.  Temperature Quenching of Yellow Ce3+ Luminescence in YAG:Ce , 2009 .

[6]  A. Sakamoto,et al.  Luminescence Characteristics of YAG Glass–Ceramic Phosphor for White LED , 2008, IEEE Journal of Selected Topics in Quantum Electronics.

[7]  S. Tanabe,et al.  Preparation and optical properties of Eu2+ and Sm3+ co-doped glass ceramic phosphors emitting white color by violet laser excitation , 2008 .

[8]  Photoluminescent and crystalline properties of Y3−xAl5O12:Cex3+ phosphor nanofibers prepared by electrospinning , 2009 .

[9]  W. Guo,et al.  Synthesis of YAG powder by alcohol-water co-precipitation method , 2007 .

[10]  A. Srivastava,et al.  On the relationship between emission color and Ce3+ concentration in garnet phosphors , 2007 .

[11]  N. Wei,et al.  Effect of annealing on the optical properties of Nd:YAG transparent ceramics , 2012 .

[12]  H. Yagi,et al.  Evaluation of properties of YAG (Ce) ceramic scintillators , 2005, IEEE Transactions on Nuclear Science.

[13]  Y. Fujimoto,et al.  Preparation of Transparent Ce3+:GdYAG Ceramics Phosphors for White LED , 2011, MSE 2011.

[14]  Mark A. Rodriguez,et al.  Luminescence, absorption, and site symmetry of Ce activated SrGa2S4 phosphors , 1997 .

[15]  D. L. Dexter,et al.  Theory of Concentration Quenching in Inorganic Phosphors , 1954 .

[16]  Sukhvir Singh,et al.  Enhanced luminescence of Y3Al5O12 : Ce3+ nanophosphor for white light-emitting diodes , 2006 .

[17]  Y. Fujimoto,et al.  Properties of transparent Ce:YAG ceramic phosphors for white LED , 2011 .

[18]  Regina Mueller-Mach,et al.  White-light-emitting diodes for illumination , 2000, Photonics West - Optoelectronic Materials and Devices.

[19]  C. Warde,et al.  Optical studies of cerium doped yttrium aluminum garnet single crystals , 1984 .