Comparison of Transmittance of Pb-Free Transparent Dielectric Made by Screen Printer and Die Coater

2005 ◽  
Vol 486-487 ◽  
pp. 325-328 ◽  
Author(s):  
Myung-Lyoung Cha ◽  
Jae Sam Jeon ◽  
Hyung Sun Kim
Keyword(s):  
Screen Printing ◽  
Thick Films ◽  
Glass Frit ◽  
Forming Process ◽  
Screen Printing Method ◽  
Sio2 Glass ◽  
Transparent Dielectric ◽  
Plasma Display ◽  
Printing Method ◽  
Free Glass

For the application of transparent dielectric layer of PDP (Plasma display panel), a Pb-free glass, ZnO-B2O3-SiO2 glass, was measured for thermal and optical properties after forming thick films. Glass frit of different size (d50=1.7, 4.3㎛) and different thickness film forming process (a die coater and a screen printer) were applied to a transparent dielectric. The coated layer was determined for pore contents, size, and transmittance. As a result, the screen printing method produced non-uniform surface and increased pores with multilayer. The die coater method, however, produced more uniform surface and less pore content compared to the screen printing method. Thus it shows that the increase of pore size and contents has detrimental effects on the transmittance of thick films made by a lead-free glass, ZnO-B2O3-SiO2 glass.

Optical Properties of Bi2O3-ZnO-SiO2 Glass System for Eco Transparent Dielectric in PDP

2005 ◽  
Vol 486-487 ◽  
pp. 321-324 ◽  
Author(s):  
Jae Sam Jeon ◽  
Myung-Ryoung Cha ◽  
Hyung Sun Kim
Keyword(s):  
Optical Properties ◽  
Dielectric Layer ◽  
Screen Printing ◽  
Thick Films ◽  
Oxide Glass ◽  
Suitable Candidate ◽  
Screen Printing Method ◽  
Transparent Dielectric ◽  
Plasma Display ◽  
Free Glass

To replace lead oxide glass, Bi2O3-SiO2-ZnO glass, as a Pb-free glass, was examined for optical properties for a transparent dielectric layer of a plasma display panel (PDP). The glass was evaluated for glass transition temperature (Tg) and thermal expansion coefficient (α). The transparent thick films produced with a screen-printing method were evaluated for optical properties. The transmittance of thick films fired at 560-620°C showed above 80%. The results suggest that the bismuth glass is a suitable candidate for one of the lead-free glasses compositions in a transparent dielectric layer.

Structural and Dielectric Properties of Screen Printed PZT(70/30) Multilayered Thick Films

2007 ◽  
Vol 124-126 ◽  
pp. 663-666 ◽  
Author(s):  
Sung Gap Lee ◽  
Sang Man Park ◽  
Young Jae Shim ◽  
Young Chul Rhee
Keyword(s):  
Screen Printing ◽  
Remanent Polarization ◽  
Thick Films ◽  
Sol Gel ◽  
Relative Dielectric Constant ◽  
Polycrystalline Structure ◽  
Coating Solution ◽  
Screen Printing Method ◽  
Xrd Patterns ◽  
Printing Method

PZT(70/30) powder was prepared by a sol-gel method and PZT thick films were fabricated by the screen-printing method on the alumina substrates. The coating and drying procedure was repeated 4 times. And then the PZT(30/70) precusor solution was spin-coated on the PZT thick films. A concentration of a coating solution was 0.5 mol/L and the number of coating was varied from 0 to 6. The porosity decreased and the grain size increased with increasing the number of coatings. The thickness of the PZT-6(6: number of coatings) films was about 60~65μm. All PZT thick films showed the typical XRD patterns of a typical perovskite polycrystalline structure. The relative dielectric constant of the PZT-6 thick film was 540. The remanent polarization and coercive field of the PZT-6 film were 23.6 μC /cm2, 12.0 kV/cm, respectively.

SYNTHESIS OF CoFe2O4/Pb(Zr0.53Ti0.47)O3 MULTIFERROIC COMPOSITE THICK FILMS BY LOW-SINTERING-TEMPERATURE SCREEN PRINTING METHOD

2011 ◽  
Vol 01 (01) ◽  
pp. 119-125 ◽  
Author(s):  
W. CHEN ◽  
C. X. HUANG ◽  
T. S. YAN ◽  
W. ZHU ◽  
Z. P. LI ◽  
...  
Keyword(s):  
Screen Printing ◽  
Sintering Temperature ◽  
Ferroelectric Properties ◽  
Thick Films ◽  
Electron Microscopic ◽  
Screen Printing Method ◽  
Pzt Films ◽  
Multiferroic Composite ◽  
Low Sintering Temperature ◽  
Printing Method

CoFe 2 O 4/ Pb ( Zr 0.53 Ti 0.47) O 3 (abbreviated as CFO/PZT) multiferroic composite thick films were successfully fabricated on alumina substrate with gold bottom electrode by screen printing method at a low-sintering temperature. The processing included the modification and dispersion of ferromagnetic CFO powder and ferroelectric PZT powder, the preparation of uniform pastes, and the selection of proper annealing temperature for composite thick films. Transmission electron microscopic pictures (TEM) indicated the submicron meter of particles size for both CFO and PZT particles. After annealing at 900°C for 1 h in air, tape test confirmed the quality of multiferroic thick films as well as pure CFO and PZT films. X-ray diffraction (XRD) showed a coexistence of CFO and PZT phases; furthermore, a smooth surface was observed through scanning electron microscopic (SEM) pictures along with the sharp cross-sectional picture, indicative of 100 μm of film thickness. Ferromagnetic and ferroelectric properties were observed in CFO/PZT films simultaneously at room temperature. Compared with the reported CFO/PZT multiferrroic thin films, the present ferromagnetic property was closing to that of the chemical sol-gel synthesized film and even that from the physical pulsed laser deposition technique. However, the ferroelectric property showed a degenerated behavior, possible reasons for this was discussed and further optimization was also proposed for the potential multifunctional application.

Electrical Properties BaTiO3 Thick Films with an Interlayer SrTiO3 Thin Films

2007 ◽  
Vol 124-126 ◽  
pp. 659-662
Author(s):  
Sung Pill Nam ◽  
Sung Gap Lee ◽  
Seong Gi Bae ◽  
Young Hie Lee
Keyword(s):  
Thin Films ◽  
Leakage Current ◽  
Spin Coating ◽  
Screen Printing ◽  
Thick Films ◽  
Sol Gel ◽  
Grain Structure ◽  
Screen Printing Method ◽  
Coating Method ◽  
Printing Method

The BaTiO3/SrTiO3 heterolayered thick films were fabricated by two different methods – thick films of BaTiO3 by screen printing method on alumina substrates electrodes with Pt, thin films of SrTiO3 by the spin-coating method on BaTiO3 thick films and once more thick films of BaTiO3 by the screen printing method on SrTiO3 layer. The leakage current and the dielectric properties were investigated for effect of various stacking sequence of sol-gel-prepared SrTiO3 layer at interface of BaTiO3 thick films. The insertion of SrTiO3 interlayer yielded BaTiO3 thick films with homogeneous and dense grain structure with the number of SrTiO3 layers. The leakage current density of the BaTiO3/SrTiO3-7 film is less that 1.5 10-9 A/cm2 at 5 V.

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