• 마이크로전자및패키징학회지
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• 제10권4호
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• pp.47-52
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• 2003

PDP전극용 Ag전극 페이스트의 프릿으로 기존의 Pb-based 프릿을 대신 할 수 있는 Bi-based 조성의 새로운 유리조성의 가능성을 검토하였다. PDP디스플레이 응용을 위해 프릿의 저융점화 및 열팽창계수 제어를 행하였고, 이를 전극 페이스트 제조에 적용하여 스크린 프린팅된 전극을 평가하였다. $Bi_2O_3$를 50-60wt%이상 첨가된 $Bi_2O_3-B_2O_3-Al_2O_3$계 조성의 프릿은 연화점이 400∼$480^{\circ}C$, 열팽창계수가 7.31∼$10.02\times 10^{-6}/^{\circ}C$이며, 전극의 단자저항은 4.1∼4.8$\Omega$ 이었다. 본 연구에서 새로이 개발된 Bi계 프릿조성은 Pb계 조성의 프릿에 상당하는 물성을 얻을 수 있었으며, 이를 전극용 페이스트에 적용한 결과, 전극 프린팅에서 퍼짐성과 균일성이 우수하였다. PDP전극용 무연, 무 알카리 프릿으로 Bi계 조성의 적용가능성을 확인할 수 있었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1229-1232
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• 2005

We report the method of preventing the grey color of Bi based glass frits caused by reduction of $Bi_2O_3$. To prevent reduction of $Bi_2O_3$, we controlled the melting temperature. Low melting temperature reduces the reduction of $Bi_2O_3$ and that makes clarity transparent glass cullets. After firing, glass frits that melted at lower temperature showed better transparency. To prevent the browning, we used some additives like CuO, $CeO_2$, CoO and $TiO_2$. The colors of glass cullets were varied according to additives. After firing, dielectric layer contained additives showed better transparency than the one without additives. In the point of reaction between dielectric layer and Ag electrode, CuO was the most effective additive in preventing the yellowing.

• 마이크로전자및패키징학회지
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• 제6권4호
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• pp.55-59
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• 1999

전자 패키징에 적용 가능한 납성분이 포함되어 있지 않는 Bi계저융점유리의 연구를 행하였다. Bi계유리중, 70wt% $Bi_2O_3$+ l5wt% $B_2O_3$ + 8wt% $SiO_2$+ 2wt% $P_2O_5$ + 4wt% $A1_2O_3$ + lwt%ZnO 성분의 유리는 융점이 약 $550^{\circ}C$ 였으며, $P_2O_5$의 함량에 따라서 그 융점이 변화하였다. 10wt%이상의 $P_2O_5$ 첨가에서는 $450^{\circ}C$의 열처리로 결정화가 진행되었다. $B_2O_3$가 많이 함유된 조성의 유리에서는 그 융점이 상승하였다.

• 한국전기전자재료학회논문지
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• 제24권10호
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• pp.844-849
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• 2011

Two kind of Ag-pastes were prepared for integrating the bulk Si solar cell. One is the Ag-paste with Pb-based glass frit and the other is that with Bi-based glass frit. The pastes were the mixture of 84 wt% Ag, 2 wt% glass frit, 11 wt% solvent of buthyl cabitol acetate, and 2 wt% additives. After fabricating the Ag-pastes, they was coated on a $SiN_x$/n+/p- stacks of a commercial mono-Si solar cell. The solar cell efficiency was 17.6% in the case of the Pb-based Ag-paste. However that was 16.2% in the solar cell integrated with the Bi-based Ag-paste. The lower performance in Bi-based Ag-paste was caused by the higher series resistance and the lower shunt resistance in comparison with the Pb-based Ag-paste.

• 한국전자파학회논문지
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• 제20권3호
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• pp.230-239
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• 2009

본 논문에서는 FM 라디오 수신을 위한 RV 차량용 글래스 안테나를 개발하였다. 형상이 간단하면서도 주어진 유리 면적을 효율적으로 이용하여 광대역 정합에 유리하고 높은 수직 편파 이득을 보이는 다중 루프 구조를 사용하였다. 또한, 상용 RV 차량에 장착 시 시야 확보 비율을 높이기 위해서 선로에 유기되는 전류 분포를 기반으로 선로 두께를 조절하여 안테나의 투명도를 향상시켰다. 제안된 안테나는 상용 RV 차량 쿼터 유리에 인쇄하였으며, 반사 손실과 이득 등의 안테나 성능을 반무반사실에서 측정하였다. 제안된 글래스 안테나는 FM 라디오 주파수 대역(80$\sim$110 MHz)에서 안테나 전방향(bore-sight direction: $\theta=90^{\circ}$, $\phi=270^{\circ}$) 평균 이득이 -9.67 dBi로 상용 모노폴 글래스 안테나의 평균 이득 -12.49 dBi와 천장 부착용 마이크로 안테나의 평균 복사 이득 -19.24 dBi 보다 높은 이득을 보였다.

• 전자공학회논문지A
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• 제29A권11호
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• pp.84-90
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• 1992

The dependence of electrical characteristics of RuO$_2$-based thick film resistors on the RuO$_2$ contents, glass composition variation and the firing temperatures was measured. The sheet resistance of resistors decreased as the contents of RuO$_2$ increased and at firing temperatures higher than C, the sheet resistance increased as the firing temperature increased. In case of using lead borosilicate glass-containing $Bi_{2}O_{3}$, the sheet resistance decreased as the contents of $Bi_{2}O_{3}$ increased. TCR changes from negative to positive values as RuO$_2$ contents increased and from positive to negative values as the firing temperature increased. TCR increased to positive values as $Bi_{2}O_{3}$ increased in the glass.

• 한국전기전자재료학회논문지
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• 제24권3호
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• pp.200-207
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• 2011

Abstract: The effect of lead free glass frit compositions on the properties of thick film conductor and resistor pastes were investigated. Two types lead free frits, HBF-A(without $Bi_2O_3$) and HBF-B(with $Bi_2O_3$) were made from $SiO_2$, $B_2O_3$, $Al_2O_3$, CaO, MgO, $Na_2O$, $K_2O$, ZnO, MnO, $ZrO_2$, $Bi_2O_3$. And Ag based conductor pastes and $RuO_2$ based resistor paste were prepared by mixed with these frits and functional phase(Ag and $RuO_2$), and organic vehicle. The properties of thick film conductor and resistor sintered at $850^{\circ}C$ were studied after printing on $Al_2O_3$ substrate. The morphology of the sintered films surface were SEM and EDS were carried out to analysis the chemical composition on resistor surface and state of Ru atom in frit matrix.

• 한국세라믹학회지
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• 제43권10호
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• pp.635-639
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• 2006

Dispersion behavior of the slurries consisted of Pb or Bi-based glass frits, which are used for the fabrication of green sheet as PDP front panel transparent dielectric, was examined in non-aqueous solvent system. Measurements of sedimentation height and viscosity were conducted to determine proper dispersion condition in the various solvent and dispersant system. Azotropic compound and ethyl acetate were used as the solvent and ammonium-type dispersant was applied to the slurries. All slurries were dispersed well in azotropic solvent system involving 20$\sim$50 vol% ethyl acetate at 2$\sim$3 wt% dispersant content. Especially, dispersion behavior was notably improved in the addition of ethyl acetate in the Bi-based frit slurry.

• 한국세라믹학회지
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• 제44권10호
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• pp.548-553
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• 2007

Ceramic green sheets consisting Bi-based glass frit were fabricated for an application to PDP transparent dielectric front panel. The dispersion condition of the slurry for tape casting was pre-examined, and two kinds of hinder and plasticizer were used in the non-aqueous slurry system. In the fabrication process for the frit film, the properties such as dry and firing shrinkage, elongation, and transmittance were examined at the condition of various mixing ratio of plasticizers. In the mixing ratio of polyethylene glycol to dibutyl phthalate of 3:5wt%, a good adhesion, elongation and transmittance were observed at the firing temperature of $580^{\circ}C$. The photograph for the cross section of the interface was also showed a dense microstructure.

• Journal of Magnetics
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• 제11권3호
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• pp.147-150
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• 2006

We have fabricated three-dimensional magnetophotonic crystals based on $\alpha$-$SiO_2$ opal films. Opal thin films grown on glass substrates were filled with bismuth substituted iron garnet (Bi:YIG). Scanning electron microscopy data, optical and magnetic properties of the synthesized samples confirm the presence of the Bi:YIG contentin the opal lattice. It is shown that the samples exhibit the (111) stop band, and transmissivity of the threedimensional magnetophotonic crystals is defined by both the film lattice and the Bi:YIG content.