• 한국전기전자재료학회논문지
• /
• 제19권8호
• /
• pp.749-753
• /
• 2006

The $ZnGa_2O_4$ phosphor thick films were fabricated using a screen printing method on Si(100) substrates at various sintering temperatures. The XRD patterns show that the $ZnGa_2O_4$ thick films have a (311) main peak and a spinel structure with increasing sintering temperatures. The particle sizes of $ZnGa_2O_4$ phosphor were about 100 nm and the thickness of $ZnGa_2O_4$ thick film was $10{\mu}m$. The CL and PL properties of $ZnGa_2O_4$ showed main peak of 420nm and maximum intensity at the sintering temperature of $900^{\circ}C$. These results indicate that $ZnGa_2O_4$ phosphor thick films hold promise for displays such as plasma display panel and field emission display.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
• /
• pp.1534-1536
• /
• 2007

ZnS-based orange-emitting phosphors were synthesized by two-step firing process: above $1000^{\circ}C$ to obtain hexagonal phase, and at $750^{\circ}C$ for cubic phase. The effect of heat treatment condition on the optical properties was investigated to fine an optimum condition for high-performance ZnS:Mn,Cu,Cl phosphor.

• 한국재료학회지
• /
• 제19권3호
• /
• pp.163-168
• /
• 2009

$Eu^{3+}$-doped $Y_2O_3$ red phosphor was synthesized in a flux method using the chemicals $Y_2O_3,\;Eu_2O_3,\;H_3BO_3$ and $BaCl_2{\cdot}2H_2O$. The effect of a flux addition on the preparation of $Y_2O_3:Eu_{3+}$ red phosphor used as a cold cathode fluorescence lamp was investigated. $H_3BO_3$ and $BaCl_2{\cdot}2H_2O$ fluxes were used due to their different melting points. The crystallinity, thermal properties, morphology, and emission characteristics were measured using XRD, TG-DTA, SEM, and a photo-excited spectrometer. Under UV excitation of 254 nm, $Eu_2O_3$ 3.7 mol% doped $Y_2O_3$ exhibited a strong narrow-band red emission, peaking at 612 nm. From this result, the phosphor synthesized by firing $Y_2O_3$ with 3.7 mol% of $Eu_2O_3$, 0.25 mol% of $H_3BO_3$ and 0.5 mol% of $BaCl_2{\cdot}2H_2O$ fluxes at $1400^{\circ}C$ for 2 hours had a larger particle size of $4{\mu}m$ on average compared to the phosphor of the $H_3BO_3$ flux alone. In addition, a phosphor synthesized by the two fluxes together had a rounder corner shape, which led to the maximum emission intensity.

• 한국재료학회:학술대회논문집
• /
• 한국재료학회 1997년도 한국재료학회 추계학술발표회
• /
• pp.164-164
• /
• 1997

• 한국세라믹학회:학술대회논문집
• /
• 한국세라믹학회 2002년도 추계총회 및 연구발표회 초록집
• /
• pp.144.1-144
• /
• 2002

• 대한전자공학회논문지SD
• /
• 제37권1호
• /
• pp.36-43
• /
• 2000

청색 발광 SrS:CuCl TFEL 소자의 휘도를 향상시키기 위하여 황 압력과 열처리 조건을 최적화하여 SrS:CuCl TFEL 소자를 제작하였다. 전자빔 증착 장비를 이용하여 SrS:CuCl 형광체를 6000 ~ 8000 ${\AA}$ 두께로 증착 시킨 후, 800 $^{\circ}C$에서 3분 동안 열처리하여 TFEL 소자를 제작시켰다. 형광체 결정은 열처리 온도 및 열처리 지속 시간의 증가에 따라 향상되었다. SrS:CuCl TFEL 소자는 468 nm 와 500 nm에서 발광 피크 파장을 나타내었고, CIE 색 좌표는 x = 0.21, y = 0.33로 청색 빛이 방출되었다. SrS:CuCl TFEL 소자의 휘도$(L_{40})$는 형광체 증착 중의 황 압력에 크게 의존하여 황 압력을 $8{\times}10^{-6}$ torr에서 $2{\tiems}10^{-5}$ torr로 증가시켰을 때 262 cd/$m^2$에서 728 cd/$m^2$로 증가되었다.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2009년도 하계학술대회 논문집
• /
• pp.430-431
• /
• 2009

In this study, europium doped strontium silicate ($Sr_2SiO_4:Eu^{2+}$) phosphor has been synthesized by conventional solid-state method and investigated luminescent characteristic. $SrCO_3$ and $SiO_2$ were mixed together by 2:1 mole ratio. Also $NH_4Cl$ was added as a flux. The mixture were sintered at $800^{\circ}C$, $1000^{\circ}C$ for 3h under the atmosphere (5% $H_2$/95% $N_2$). This phosphor can be applicated to the yellow phosphor for white LED because it has yellow emission band (540nm), which emits efficiently under the 370nm excitaion energy.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 1999년도 추계학술대회 논문집
• /
• pp.570-573
• /
• 1999

High brightness (Y$_{x}$/Gd$_{1-x}$ )$_2$O$_3$:Eu Phosphor Particles were directly Prepared in the spray Pyrolysis by adding flux materials such as LiCl and HBO$_3$. The (Y$_{x}$/Gd$_{1-x}$ )$_2$O$_3$:Eu particles prepared from solution with flux material had higher PL (photoluminescence) intensities than those prepared from solution without flux. In the spray pyrolysis, the flux acts as promoter of the growth of crystallite and activation of doping material as in the solid state reaction method. Additionally, the flux improved PL intensity of (Y$_{x}$/Gd$_{1-x}$ )$_2$O$_3$:Eu phosphor particles by densifying the internal structure and eliminating the defect existing inside and surface of (Y$_{x}$/Gd$_{1-x}$ )$_2$O$_3$:Eu phosphor particles.r particles.

• Bulletin of the Korean Chemical Society
• /
• 제31권11호
• /
• pp.3075-3076
• /
• 2010

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
• /
• pp.370-373
• /
• 2003

A search for a new phosphor composition of excellent performance in systematic ways requires lots of research efforts, and often turns out to be very timeconsuming and difficult. Thus, usually practical ways are taken to improve the performance of phosphors. A few examples of practical surface treatments on phosphors such as $In_2O_3$ coating on $ZnGa_2O_4:Mn$, phosphoric acid treatment on ZnS:Ag,Cl, and base KOH treatment with ultrasonication on ZnS:Ag,Cl are presented. The reasons for the improvement of luminescence intensity or degradation properties after these treatments are discussed based upon careful analyses on the surface of the phosphors and a proposed model on charge carriers generated by electron beam excitation.