Ultraviolet‐Sensitive OLED with Tunable Wavelength and Intensity by Integrated ZnO Nanowires Schottky Junction

Abstract

Organic light‐emitting diode (OLED) displays are one of the dominant flat panel display technologies. Here, a novel ultraviolet (UV)‐sensitive OLED (USO) is reported, which emits visible light with adjustable wavelength and brightness according to the intensity of the incident UV light. The USO employs zinc oxide nanowires (ZnO NWs) with Schottky junctions to control current and engages exciplex‐emitting OLED to emit light according to the incident UV light. As the UV light intensity increases from 0.09 to 8.15 mW cm−2, USO emits light with a peak wavelength that ranges from 595 to 525 nm, a color coordinate from (0.458, 0.485) to (0.339, 0.555), and a light intensity that is anywhere from 97 to 6915 cd m−2. The USO has a fast photoresponse characteristic due to the effect of the Schottky barrier introduced by the close contact of the ZnO NWs and gold electrodes. The luminescence color of the USO changes from dark orange to harsh green because of the exciplexes’ different formation ratios under differing UV intensities. As a result of the USO taking advantage of the Schottky barrier and exciplex, the realization of many innovative applications in optoelectronic devices is possible.

Recent Progress in Electrohydrodynamic Jet Printing for Printed Electronics: From 0D to 3D Materials

“…Poor ink quality can be a significant contributing factor to the clogging or breaking of a printer head. Additionally, current nozzles are limited to a minimum inner diameter of approximately 10 µm, constraining the resolution of printed 3D structures to physical dimensions which are also on the order of ten microns and therefore presenting an obstacle to the manufacturing of finer structures [30][31][32][33]. Although photocuring molding technology and micro-stereolithography can print complex structures with high molding accuracy, they are only applicable to photosensitive materials or photosensitive resin materials [34].…”

Polarization detection of ultraviolet light using ZnO microwires

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