Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (12): 1265-1269.DOI: 10.15541/jim20140131

• Orginal Article • Previous Articles     Next Articles

Preparation and Performance of KNN-based Upconversion Transparent Ceramics

GENG Zhi-Ming1, LI Kun1,2, SHI Dong-Liang1, SHI Xia-Yu1, HUANG Hai-Tao2, CHAN Helen Lai Wa2   

  1. (1. School of Materials and Engineering, Changzhou University, Changzhou 213164, China; 2. Department of Applied Physics, Hongkong Polytechnic University, Hongkong China)
  • Received:2014-03-19 Revised:2014-05-06 Published:2014-12-20 Online:2014-11-20
  • About author:GENG Zhi-Ming. E-mail: xiaomingkx@live.com

Abstract:

Upconversion transparent ceramics K0.5(1-y)Na0.5(1-y)LiyNb1-yBiyO3-Er0.005Yb0.005x(Er3+/Yb3+:KNNLB, x=0-3, y=0-0.09) were fabricated by hot-press sintering process using LiBiO3 as additives. The microstructure, optical transparency and upconversion fluorescence were investigated.The results show that the crystalline phase of the ceramics is orthorhombic-perovskite structure.The ceramics are well densified, and the grain size of the ceramics is about 0.5 μm.These ceramics present good transparency in the infrared and the long-wavelength visible regions, but the optical transparency declines rapidly in the visible region as the amount of Yb3+ and Er3+ ions increases.The transparency of the ceramics with y = 0.06 and x = 0 reaches 45% in the visible region and over 95% in the infrared region(the thickness of the sample is 0.5 mm).The strong upconversion fluorescence is observed when the ceramics are excited by the 900 nm-wavelength light of an xenon lamp.

Key words: sodium potassium niobate, transparent ceramic, hot-pressing, upconversion emission

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