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Optical second harmonic generation at heterojunction interfaces of a molybdenum trioxide layer and an organic layer
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Image of FIG. 1.

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FIG. 1.

SH spectra of (a) glass/ITO (150 nm), (b) glass/ITO (150 nm)/ (0.75 nm)/-NPD (60 nm), and (c) glass/ITO (150 nm)/ (1 nm)/-NPD (60 nm) systems. All spectra are normalized by the SH spectra of . Dashed line represents SH photon energy used in studying SH intensity as a function of layer thickness.

Image of FIG. 2.

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FIG. 2.

SH intensities of (a) glass/ITO (150 nm)/ ( nm) /-NPD (60 nm) system, (b) glass/ITO (150 nm)/ ( nm) system, and (c) glass/ITO (30 nm) sample, as function of thicknesses [normalized by SH intensity from GaAs (001)]. Solid and dotted lines are guide to eyes.

Image of FIG. 3.

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FIG. 3.

Schematic diagram showing induced SH polarization in three cases, (a) ITO layer, (b) system, and (c) -NPD system.

Image of FIG. 4.

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FIG. 4.

Change in nonlinear susceptibility at -NPD interfaces as function of layer thickness. Solid line is guide to eyes.

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/content/aip/journal/apl/97/19/10.1063/1.3513297
2010-11-08
2014-04-19

Abstract

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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Scitation: Optical second harmonic generation at heterojunction interfaces of a molybdenum trioxide layer and an organic layer
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/19/10.1063/1.3513297
10.1063/1.3513297
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