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Title: Preparation and performance of KNN-based upconversion transparent ceramics
Authors: Geng, ZM
Li, K
Shi, DL
Shi, XY
Huang, HT 
Chan, HLW 
Issue Date: 2014
Source: 無機材料學報 (Journal of inorganic materials), 2014, v. 29, no. 12, p. 1265-1269
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 £gm.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.
Keywords: Hot-pressing
Sodium potassium niobate
Transparent ceramic
Upconversion emission
Publisher: 中國學術期刊(光盤版)電子雜誌社
Journal: 無機材料學報 (Journal of inorganic materials) 
ISSN: 1000-324X
EISSN: 1463-0176
DOI: 10.15541/jim20140131
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