• 제목/요약/키워드: $Tb_3Al_5O_{12}:Ce$

검색결과 6건 처리시간 0.032초

Thin Film Deposition of Tb3Al5O12:Ce by Pulsed Laser Ablation and Effects of Low-temperature Post-annealing

  • Kim, Kang Min;Chung, Jun Ho;Ryu, Jeong Ho
    • Journal of the Optical Society of Korea
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    • 제16권1호
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    • pp.76-79
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    • 2012
  • $Tb_3Al_5O_{12}:Ce$ (TAG:Ce) thin films were successfully deposited by a pulsed laser ablation method on a quartz substrate, and low-temperature post-annealing effects on luminescent properties were investigated in detail. TAG:Ce thin films were analyzed by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy. The as-deposited films were amorphous, and post-annealing above $700^{\circ}C$ was required for crystallization. The post-annealed TAG:Ce thin films showed strong and broad emission bands around 542 nm and excitations at 451 nm, which all corresponded to transitions between the 4f ground level to the $5d^1$ excited levels of Ce ion.

Spectral Properties of Various $Y_3Al_5O_{12}:Ce^{3+}$ Nanocrystalline Phosphors for the Application of White LEDs

  • Yang, Hee-Sun;Jeon, Mi-Jung;Huh, Young-Duk
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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    • pp.1593-1596
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    • 2007
  • Various yellow-emitting $Y_3Al_5O_{12}:Ce^{3+}$ (YAG:Ce) nanocrystalline phosphors, where some $Al^{3+}$ sites are substituted with $Ga^{3+}$ or some Y sites with Gd3+, have been synthesized. The rare earth ions such as $Pr^{3+}$ and $Tb^{3+}$ were also co-doped into YAG:Ce system, leading to the tunability of CIE coordinates of emission.

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White ACPEL Device with ZnS:Cu,Cl, $Tb_3Al_5O_{12}:Ce^{3+}$, and CaS:$Eu^{2+}$ Phosphors Using a Layered Structure

  • Park, Bong-Je;Seo, Hong-Seok;Ahn, Jun-Tae;Oh, Dae-Kon;Chung, Woon-Jin;Han, Ji-Yeon;Jang, Ho-Seong;Jeon, Duk-Young
    • ETRI Journal
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    • 제31권6호
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    • pp.803-805
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    • 2009
  • Improvement of the color rendering index (CRI) and luminance of a white alternate current powder electroluminescent (ACPEL) device has been attempted using ZnS:Cu,Cl, $Tb_3Al_5O_{12}$:Ce (TAG:Ce), and CaS:Eu phosphors with a layered structure. The device with TAG:Ce and ZnS:Cu,Cl phosphors showed a CRI of 75, with a luminance increase of about 30% depending on the thickness of the TAG:Ce. Further CRI improvement was attempted using CaS:Eu. When they were separately screen-printed, the CRI was increased up to 89 with no decrease in luminance.

졸-겔 방법을 이용한 BaGd2TiO13 구조의 제작

  • 이수현;;유재수
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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    • pp.424-424
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    • 2013
  • Ce3+, Sm3+, Eu3+, Tb3+ 등 희토류를 도핑한 여러 종류의 형광체는 백색 LED (white light-emitting diode), 전계방출표시소자(field emission display), 플라즈마디스플레이패널(plasma display panel), 약물 운송(drug delivery) 등 다양한 분야에서 응용되고 있다. 최근에는 졸-겔 방법(sol-gel method)을 이용하여Y2SiO5, Y3-XGdxAl5O12, SrAl2O4 등 여러 종류의 호스트 물질을 합성하여 형광체의 특성을 분석하는 연구가 활발히 진행되고 있다. 이러한 졸-겔 방법은 비교적 낮은 온도에서 간단한 공정으로 좋은 균질성과 높은 생산성을 갖도록 형광체를 제작할 수 있는 장점을 가지고 있다. 이에 본 연구에서는 졸-겔 방법을 이용하여 BaGd2TiO13구조를 제작하였고, 이러한 구조적, 광학적 특성을 분석하기 위하여 열분석기(thermal analyzer), 전계방출형주사전자현미경(field emission scanning electron microscopy), 투과전자현미경(field emission transmission electron microscopy)을 이용하였다. 이러한 졸-겔 방법을 이용하여 제작한 BaGd2TiO13 구조의 형광체 적용 연구를 통한 디스플레이 및 백색 LED 응용에 유용할 것으로 기대된다.

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삼중수소 검출용 광섬유 방사선 센서의 제작 및 특성분석 (Fabrication and Characterization of a Fiber-optic Radiation Sensor for Detection of Tritium)

  • 장경원;조동현;유욱재;이봉수;문주현;박병기;조영호;김신
    • 한국광학회지
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    • 제20권4호
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    • pp.201-206
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    • 2009
  • 본 연구에서는 무기섬광체와 광섬유를 이용하여 삼중수소 검출용 광섬유 방사선 센서를 제작하였다. 무기섬광체 선택을 위해 $Gd_2O_2S$ : Tb, $Y_3Al_5O_{12}$ : Ce, CsI : Tl을 이용하여 센서팁을 제작한 후, 금속 수소화물 형태의 삼중수소를 이용하여 섬광효율이 가장 좋은 섬광체를 선별하였다. 또한 선정된 섬광체를 사용하여 제작한 센서를 이용하여 삼중수소 선원으로부터 거리에 따른 섬광량을 계측하였고 선원의 방사능 세기에 따른 섬광량을 측정하여 표면 방사능 모니터의 결과와 비교 분석하였다.

Fast response time PDP phosphors for 3D display application

  • Song, Jay-Hyok;Song, Yu-Mi;Kim, Ji-Hyun;Kim, Min-Ju;Kim, Ji-Hyun;Kwon, Seon-Young;Park, Do-Hyung;Kim, Yoon-Chang;Zang, Dong-Sik
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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    • pp.1255-1258
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    • 2008
  • New phosphors that enable the 3D application of PDP have been developed The decay times of $Y_3Al_5O_{12}:Ce^{3+}$, $(Y,Gd)Al_3(BO_3)_4:Tb^{3+}$ and $(Y,Gd)_2O_3:Eu^{3+}$ were extremely shorter than those of conventional PDP phosphors. The color coordinates and intensities of the phosphors were also suitable for PDP For the first time in PDP industry, 3D/2D switchable PDP has been commercially available by adopting the phosphors.

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