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Optical second harmonic generation at heterojunction interfaces of a molybdenum trioxide layer and an organic layer
2.Y. R. Shen, The Principles of Nonlinear Optics (Wiley, New York, 1984).
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We have observed optical second harmonic generation(SHG) from a space charge layer (SCL) in a stacked indium tin oxide (ITO)/molybdenum trioxide -diphenyl--bis(1-naphthly)--biphenyl--diamine (-NPD) system. When the thicknesses were increased, the SHG signals from this system decreased sharply at smaller thicknesses, and were saturated at thicknesses larger than 1 nm. These results prove the vital role of SCL in improvement of drive voltages of organic light-emitting diodes.
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