Effect of a critical percolation threshold in purified short carbon nanotube-polymer/ZnS:Cu,Cl composite on electroluminescence |
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Authors: | Jin-Young Kim Hoonbae Kim Shang Hyeun Park Taewon Jeong Min Jong Bae Yong Churl Kim Intaek Han Donggeun Jung SeGi Yu |
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Affiliation: | 1. Department of Physics, BK 21 Physics Research Division, Sungkyunkwan University, Suwon 440-746, Republic of Korea;2. Electronic Materials Lab., SAIT Samsung Electronics, Yongin 446-712, Republic of Korea;3. Department of Physics, Hankuk University of Foreign Studies, Yongin 449-791, Republic of Korea |
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Abstract: | AC driven inorganic electroluminescence (EL) of the carbon nanotube (CNT)-polymer/phosphor composite was fabricated to investigate the effect of the critical percolation threshold by CNT concentration on EL performance. In order to control the appropriate CNT condition in EL device, CNTs were shortened by cryogenic crushing and purified by thermal treatment. Among various CNT concentrations in the composite film, the critical percolation threshold can be found to be 0.0925 wt.% by fitting conductivity data of the composite film. Near the critical percolation threshold of a CNT concentration, the EL performances of the composite EL were greatly increased compared to the reference EL. The tunneling barrier thickness at the ZnS–CuxS contact could become thin to induce more charge carrier tunneling into ZnS host lattice by the local field enhancement of CNTs, resulting in increased electron–hole recombination to produce more light emission. |
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Keywords: | Carbon nanotube Percolation threshold Field enhancement Electroluminescence |
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