Search for new phosphors for flat panel displays and lightings using combinatorial chemistry and computational optimization

  • Sohn, Kee-Sun (Department of Materials Science and Metallurgical Engineering, Sunchon National University) ;
  • Jung, Yu-Sun (Department of Materials Science and Metallurgical Engineering, Sunchon National University) ;
  • Cho, Sang-Ho (Department of Materials Science and Metallurgical Engineering, Sunchon National University) ;
  • Kulshreshtha, Chandramouli (Department of Materials Science and Metallurgical Engineering, Sunchon National University)
  • Published : 2006.08.22

Abstract

An evolutionary optimization process involving genetic algorithm and combinatorial chemistry was employed in an attempt to develop titanate-based red phosphors suitable for tri-color white light emitting diodes We screened a eight-cation oxide system including $(K,Li,Na)_x(Y,Gd,La,Eu)_yTi_zO_{\delta}$ in terms of luminescent efficiency. The combination of genetic algorithm and combinatorial chemistry was proven to enhance the searching efficiency when applied for phosphor screening. As a result, the composition was optimized to be $(Na_{0.92}Li_{0.08})(Y_{0.8}Gd_{0.2})TiO_4:Eu^{3+}$, The luminance of this phosphor was 110 % of that of well-known scheelite variant phosphor at an excitation of 400 nm.

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