YAG phosphor with spatially separated luminescence centers

A micron size YAG:Ce/YAG:Cr core–shell structure was designed and accomplished via the urea homogeneous precipitation method using the YAG:Ce spherical core as the introduced second phase. A well dispersed gel like encapsulation structure can be achieved before the formation of YAG:Ce/YAG:Cr core–shell particles via a calcination process. As prepared YAG:Ce/YAG:Cr particles can emit a broad range of photons from 500 to 750 nm with excitation light of 433 nm. A schematic illustration showing the mechanism of excitation–emission of the core–shell particles is presented. The integral spectra are composed of three parts: emission photons of YAG:Cr, YAG:Ce, and emission light of YAG:Cr excited by the emission photons of the YAG:Ce core according to the proposed mechanism. The method accomplished in this work can significantly improve the exploration of full spectrum luminescent powder synthesis and spectra designation.

[1]  Jun Jiang,et al.  Application of urea precipitation method in preparation of advanced ceramic powders , 2015 .

[2]  Hong Liu,et al.  Al2O3/yttrium compound core–shell structure formation with burst nucleation: a process driven by electrostatic attraction and high surface energy , 2014 .

[3]  Huaidong Jiang,et al.  Partial wet route for YAG powders synthesis leading to transparent ceramic: A core–shell solid-state reaction process , 2013 .

[4]  Hong Liu,et al.  Mechanism of ammonium sulfate regulation effect on microstructure of Y2O3 nanopowders via urea precipitation method , 2013 .

[5]  Hong Liu,et al.  Synthesis of Monodispersed Spherical Yttrium Aluminum Garnet (YAG) Powders by a Homogeneous Precipitation Method , 2012 .

[6]  Hong Liu,et al.  Ammonium sulfate regulation of morphology of Nd:Y2O3 precursor via urea precipitation method and its effect on the sintering properties of Nd:Y2O3 nanopowders , 2012 .

[7]  Ru‐Shi Liu,et al.  Advances in Phosphors for Light-emitting Diodes. , 2011, The journal of physical chemistry letters.

[8]  清水 義則,et al.  A light-emitting device and a display device , 2011 .

[9]  C. Yeh,et al.  Light Converting Inorganic Phosphors for White Light-Emitting Diodes , 2010, Materials.

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

[11]  James S. Speck,et al.  Prospects for LED lighting , 2009 .

[12]  B. P. Sullivan,et al.  Energy transfer and enriched emission spectrum in Cr and Ce co-doped Y3Al5O12 yellow phosphors , 2008 .

[13]  Xiaodong Li,et al.  Uniform Colloidal Spheres for (Y1−xGdx)2O3 (x = 0–1): Formation Mechanism, Compositional Impacts, and Physicochemical Properties of the Oxides , 2008 .

[14]  R. Xie,et al.  Silicon-based oxynitride and nitride phosphors for white LEDs—A review , 2007 .

[15]  Jong Kyu Kim,et al.  Solid-State Light Sources Getting Smart , 2005, Science.

[16]  Shuji Nakamura,et al.  The Blue Laser Diode: GaN based Light Emitters and Lasers , 1997 .

[17]  Kenneth R. Hesse,et al.  Phase Development and Luminescence in Chromium‐Doped Yttrium Aluminum Garnet (YAG:Cr) Phosphors , 1994 .

[18]  S. Nakamura,et al.  Candela‐class high‐brightness InGaN/AlGaN double‐heterostructure blue‐light‐emitting diodes , 1994 .

[19]  E. Matijević,et al.  Preparation and Properties of Monodispersed Colloidal Particles of Lanthanide Compounds: III, Yttrium(III) and Mixed Yttrium(III)/Cerium(III) Systems , 1988 .

[20]  G. Blasse,et al.  Investigation of Some Ce3+‐Activated Phosphors , 1967 .

[21]  G. Blasse,et al.  A NEW PHOSPHOR FOR FLYING‐SPOT CATHODE‐RAY TUBES FOR COLOR TELEVISION: YELLOW‐EMITTING Y3Al5O12–Ce3+ , 1967 .