Preparation and Performance of KNN-based Upconversion Transparent Ceramics

doi:10.15541/jim20140131

Abstract

Abstract:

Upconversion transparent ceramics K_0.5(1-_y₎Na_0.5(1-_y₎Li_yNb_1-_yBi_yO₃-Er_0.005Yb_0.005_x(Er³⁺/Yb³⁺:KNNLB, x=0-3, y=0-0.09) were fabricated by hot-press sintering process using LiBiO₃as 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

CLC Number:

TQ174

GENG Zhi-Ming, LI Kun, SHI Dong-liang, SHI Xia-Yu, HUANG Hai-Tao, CHAN Helen Lai Wa. Preparation and Performance of KNN-based Upconversion Transparent Ceramics[J]. Journal of Inorganic Materials, 2014, 29(12): 1265-1269.

Figures/Tables 7

Fig. 1 XRD patterns of Er3+/Yb3+:KNNLB(x=0-3, y=0.06) transparent ceramics

Fig. 2 SEM images of Er3+/Yb3+:KNNLB transparent ceramics (a) Without LiBiO3 additives; (b) Added 6mol% LiBiO3 additives

Fig. 3 Photographs of Er3+/Yb3+:KNNLB transparent ceramics (x=0-3, y=0.06)

Fig. 4 Transmittance of Er3+:KNNLB (y=0.06) ceramics (a) and Er3+/Yb3+:KNNLB (x=0-3, y=0.06) ceramics (b) in UV- visible region

Fig. 5 Transmittance of Er3+/Yb3+:KNNLB(x=0-3, y=0.06) ceramics in infrared region

Fig. 6 Upconversion spectra of Er3+/Yb3+: KNNLB (x=0-3, y=0.06) ceramics at excitation of 900 nm

Fig. 7 Schematic energy level diagram of Er3+and Yb3+ in Er3+/Yb3+:KNNLB ceramics at excitation of 900 nm

References 19

[1]	LI ZHENGFA, LI YONGXIANG, ZHAI JIWEI. Grain growth and piezoelectric property of KNN-based lead-free ceramics. Current Applied Physics, 2011, 11: s2-s13.
[2]	SCHIEMER JASON, WITHERS RAY L, YUN LIU, et al. Ferroelectric and octahedral tilt twin disorder and the lead-free piezoelectric, sodium potassium niobate system. Journal of Solid State Chemistry, 2012, 195: 55-62.
[3]	KUMAR P, PATTANAIK M SONIA. Synthesis and characterizations of KNN ferroelectric ceramics near 50/50 MPB. Ceramics International, 2013, 39: 65-69.
[4]	EVELYN HOLLENSTEIN, DRAGAN DAMJANOVIC, NAVA SETTER. Temperature stability of the piezoelectric properties of Li-modified KNN ceramics. Journal of the European Ceramic Society, 2007, 27: 4093-4097.
[5]	PALEI P, PATTANAIK M, KUMAR P.Effect of oxygen sintering on the structural and electrical properties of KNN ceramics. Ceramics International, 2012, 38: 851-854.
[6]	VENDRELL X, GARCÍA J, RUBIO-MARCOS F, et al. Exploring different sintering atmospheres to reduce nonlinear response of modified KNN piezoceramics. Journal of the European Ceramic Society, 2013, 33: 825-831.
[7]	ZHAO YONGJIE, HUANG RONGXIA, LIU Rongxia, et al. Low-temperature sintering of KNN with excess alkaline elements and the study of its ferroelectric domain structure. Current Applied Physics, 2013, 13: 2082-2086.
[8]	TANG FU-SHENG, DU HONG-LIANG, LIU DAI-JUN, et al. Sintering characteristic and piezoelectric properties of lead-free (K0.5Na0.5)NbO3-LiNbO3 ceramics. Journal of Inorganic Materials, 2007, 22(2): 323-327.
[9]	RUBIO-MARCOS F, MARCHET P, MERLE-MEJEAN T, et al. Role of sintering time, crystalline phases and symmetry in the piezoelectric properties of lead-free KNN-modified ceramics. Materials Chemistry and Physics, 2010, 123: 91-97.
[10]	KOSEC M, BOBNAR V, HROVAT M, et al.New lead-free relaxors based on the K0.5Na0.5NbO3-SrTiO3 solid solution. J. Mat. Res., 2004, 19(06): 1849−1854.
[11]	ZHANG BO-PING, LI JING-FENG, WANG KE, et al. Compositional dependence of piezoelectric properties in NaxK1−xNbO3 lead-free ceramics prepared by spark plasma sintering. Journal of the American Ceramic Society, 2006, 89(5): 1605-1609.
[12]	PATRO P K, KULKARNI A R, GUPTA S M, et al.Improved microstructure, dielectric and ferroelectric properties of microwave-sintered Sr0.5Ba0.5Nb2O6. Physica B: Condensed Matter, 2007, 400(1/2): 237-242.
[13]	HU C, LI F, QU D, et al.Developments in hot pressing (HP) and hot isostatic pressing (HIP) of ceramic matrix composites. Advances in Ceramic Matrix Composites, 2014: 164-189.
[14]	李坤, 施东良, 李发亮, 等. 常压烧结制备透明铌酸钾钠陶瓷.功能材料, 2010, 3(43): 290-293.
[15]	LI K, LI F L, WANG Y, et al.Hot-pressed K0.48Na0.52Nb1–xBixO3 (x=0.05-0.15) lead-free ceramics for electro-optic applications. Mater. Chem. Phys., 2011, 131: 320-324.
[16]	KWOK K W, LI F L, LIN D.A novel lead-free transparent ceramic with high electro-optic coefficient. Funct. Mater. Lett., 2011, 4(3): 237-240.
[17]	卢玉妹.消除或减轻化学实验室污染的探讨. 河北省科学院学报, 2002, 19(2): 123-124.
[18]	徐东勇, 臧竞存. 上转换激光和上转换发光材料的研究进展.人工晶体学报, 2001, 31(2): 203-210.
[19]	WU XIAO, KWOK K W, LI FALIANG. Upconversion fluorescence studies of Sol-Gel-derived Er-doped KNN ceramics. Journal of Alloys and Compounds, 2013, 580: 88-92.