On December 21st, nanoscale light sources are important for biosensing, high-density storage, near-field optical lithography, and nanophotonics. Unfortunately, most inorganic semiconductors are fabricated. Due to the difficulty in fabrication, the quantum confinement effect causes the electronic band structure to change, so it is not suitable for miniaturization. Fortunately, organic light-emitting materials in organic light-emitting diodes (OLEDs) are not limited by quantum effects because they belong to an amorphous structure, which provides another opportunity for miniaturization.
   Recently, researchers have used insulating materials (such as silicon dioxide) to separate the active light-emitting layer and attempted to fabricate nano-scale OLEDs. These studies have confirmed that it is feasible to pattern OLED active luminescent materials in the insulating layer to produce sub-micron luminescent pixels. of. The fly in the ointment is that the process of such components often causes charge spreading, making the area of ​​the illuminating area much larger than expected.
   Recently, the research team at the University of Texas at Dallas used nano-imprint lithography (NIL) to truly "separate" the active luminescent layer in nanoscale OLEDs. Their method is to first fabricate SU-8 nanochannels with vertical sidewalls by nanoimprinting, and then evaporate the two organic metal molecules NPB and Alq3 into the nanochannels to overcome the charge. Scattered questions.
   The researchers compared components made with SU-8 nanochannels to micron-scale sources and found that even if the size is reduced to nanometers, component performance is not compromised. In addition, the researchers used surface potential microscopy (SPM) to observe periodic changes in the surface potential of the device, confirming that the active luminescent material is electrically isolated, so it can be illuminated by nanoscale OLEDs. The vision of OLED miniaturization. See Nanotechnology 20, p.405204 (2009) for details.
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