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Positive and negative components of magnetoconductance in hole transport limited organic light-emitting diodes
3.Ö. Mermer, G. Veeraraghavan, T. L. Francis, Y. Sheng, D. T. Nguyen, M. Wohlgenannt, A. Köhler, M. K. Al-Suti, and M. S. Khan, Phys. Rev. B 72, 205202 (2005).
13.B. K. Li
, H. T. He
, W. J. Chen
, M. K. Lam
, K. W. Cheah
, and J. N. Wang
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Two kinds of devices using -Di(naphthalen-1-yl)--diphenyl-benzidine (NPB) and dye-doped NPB as emitting layer were fabricated to study their magnetoconductance (MC) response. The MC of the NPB devices contains a positive low-field component but a negative high-field component at low temperatures. Similar MC is presented in the dye-doped NPB devices even at room temperature. Magnetoelectroluminescence results and energy-level diagram indicate that long lifetime triplet excitons and excessive holes are in these devices. All these observations suggest that triplet exciton-hole reaction is responsible for the negative MC while positive MC is assigned to hyperfine mixing of electron-hole pairs.
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