Jeong Hee Lee

Publications (2)6.01 Total impact

• Source

  Available from: skku.edu

  Article: Carbon nanotube induced enhancement of electroluminescence of phosphor

  Min Jong Bae, Shang Hyeun Park, Tae Won Jeong, Jeong Hee Lee, In Taek Han, Yong Wan Jin, Jong Min Kim, Jin-Young Kim, Ji Beom Yoo, Se Gi Yu
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  ABSTRACT: Electroluminescence (EL) was observed on conventional cathodoluminescent (CL) phosphor with the incorporation of carbon nanotube (CNT) at ambient air. The role of CNT can be understood as enhancing the local electrical field, which allows electron injection to the active center of phosphor at relatively low operating voltages. In this EL device, the brightness of CL phosphor was significantly improved from no light emission in the case of no addition of CNT to 35 cd / m ² with 1 wt  % CNT at 10 kHz of ac 300 V.
  Applied Physics Letters 09/2009; · 3.84 Impact Factor
• Article: Field-emission characteristics of carbon nanotube paste layers

  Tae Sik Oh, Ji Beom Yoo, Chong Yun Park, Seong Eui Lee, Jeong Hee Lee, Jong Min Kim
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  ABSTRACT: A three-dimensional simulator was used to analyze the field-emission mechanism of a carbon nanotube (CNT) emitter layer as a surface electron emitter in a triode structure for field-emission display. An electrostatic image potential was added to the Fowler-Nordheim equation to improve the accuracy of the calculation, and then several important parameters affecting the field-emission characteristics were studied. We calculated the field enhancement factor (β) and emission factor (κ) of the CNT emitter layer using the experimentally obtained current-voltage ( I-V ) values and the extended Fowler-Nordheim equation by the least-squares-fitting method. By simulating 211 structures, we confirmed the existence of a shielding effect between the emitters and a penetration phenomenon of the anode voltage.
  Journal of Applied Physics 11/2005; · 2.17 Impact Factor