Synthesis and characterization of monodisperse yttrium aluminum garnet (YAG) micro-crystals with rhombic dodecahedron

Tao Xu, Rui Yuan, Peng Cheng Xu, Dong Jie Pan, Woochul Yang, Hai Bo Guo, Yu Fang Shen, Jian Feng Hu, Zhi Jun Zhang, Jing Tai Zhao

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Uniform, monodisperse yttrium aluminum garnet (YAG) rhombic dodecahedron micro-crystals were synthesized using coprecipitation and hydrothermal methods. The Na2SO4 as a surfactant was helpful in improving the dispersity of the crystallites and forming well-faceted, micro-sized dodecahedral YAG crystallites. The effect of the reaction time and the solvent has also been studied. The crystal growth mechanism called dissolution/crystallization was determined by analyzing the experimental and simulated results. And the specific well-developed crystal facets in the {110} family have been demonstrated by the theoretical calculation. A higher integrated emission intensity can be achieved for the YAG:Ce crystallites by improving the phase purity, morphology with better developed dodecahedrons, and dispersion. Furthermore, a rather high luminous efficacy (LE = 104.14 lm/W) for the white LED fabricated using the YAG:Ce3+ phosphor prepared in this work was realized. The correlation between the crystal growth, morphology and luminescence properties of YAG crystallites has been established, which exhibits a great importance for the synthesis and application of mono-dispersed YAG crystallites.

Original languageEnglish
Pages (from-to)537-547
Number of pages11
JournalJournal of Alloys and Compounds
Volume762
DOIs
StatePublished - 25 Sep 2018

Keywords

  • Coprecipitation & hydrothermal methods
  • Crystal growth & structure
  • Luminescence
  • Monodisperse
  • Morphology
  • Optical materials

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