• 제목/요약/키워드: Materials Technology

검색결과 27,348건 처리시간 0.054초

Highly transparent Pt ohmic contact to InGaN / GaN blue light - emitting diodes

  • Huh, Chul;Kim, Hyun-Soo;Kim, Sang-Woo;Lee, Ji-Myon;Kim, Dong-Joon;Kim, Hyun-Min;Park, Seong-Ju
    • Journal of Korean Vacuum Science & Technology
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    • 제4권3호
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    • pp.78-80
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    • 2000

  • We reprot on the fabrication and characterization of InGaN/GaN multiple quantum well light-emitting diode (LED) with a highly transparent Pt ohmic contact as a current spreading layer. The value of light transmittance of a Pt thin film with a thickness of 8 nm on-GaN was measured to be 85% at 450 nm. The peak wavelength and the full-width at half-maximum (FWHM) of the emission spectrum of the LED at 20 mA were 453 nm and 23 nm, respectively. Pt-contacted LEDs show good electrical properties and high light-output efficiency compared to Ni/Au-contacted ones. These results suggest that a Pt thin film can be used as an effective current spreading layer with high light-transparency.

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Effect of Deformation Temperature on Crystal Texture Formation in Hot Deformed Nanocrystalline SmCo5 Permanent Magnets

  • Ma, Q.;Yue, M.;Lv, W.C.;Zhang, H.G.;Yuan, X.K.;Zhang, D.T.;Zhang, X.F.;Zhang, J.X.;Gao, X.X.
    • Journal of Magnetics
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    • 제21권1호
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    • pp.25-28
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    • 2016

  • In the present study, bulk anisotropic nanocrystalline $SmCo_5$ magnets were prepared by hot deformation. The effect of deformation temperature on the texture and magnetic properties are presented, based on which the mechanism of plastic deformation and texture formation during the hot deformation process is discussed. Our analyses reveal that deformation temperature is one of the most important parameters that determine the texture of $SmCo_5$ grains. We suggest that diffusion creep plastic deformation occurs during hot deformation, which is very sensitive to the energy gain provided by an increase in temperature.

  • https://doi.org/10.4283/JMAG.2016.21.1.025 인용 PDF KSCI