Optical upconverters that convert near-infrared (NIR) light into visible light by directly connecting organic photovoltaic (OPV) devices and organic light-emitting diodes (OLEDs) in series are attracting attention for their potential applications in medicine, night vision, security, and detection. The use of organic system materials eliminates the need for NIR Si integrated circuits and removes limitations on substrate types. The high performance of organic compounds, combined with the manufacturing flexibility of OLEDs, simplifies the production process and reduces costs. The color of the upconversion electroluminescence spectrum can vary across the visible region, from blue to red. Our device achieved a maximum luminance greater than 100cd/m2 of green light at 8.5V when illuminated by an 840nm NIR light (1 mW/cm2), and the device reaches an infrared-to-visible upconversion efficiency of 7.23%.
Non-metallic mirror, such as semiconductor distributed Bragg reflectors (DBRs), has been widely integrated in the structure of optoelectronic devices. However, constructing conductive DBR in organic optoelectronic device is still scarce, because of the incompatibility of high-temperature processes in the preparation of inorganic DBR. Herein, it is confirmed that organic-oxide hybrid DBR can achieve high conductivity and light manipulation. When thermal evaporated material MoO3 is doped into organic material (1,1-bis[4-[N,N-di(p-tolyl)amino]phenyl]cyclohexane, TAPC), the conductivity of TAPC can be increased by ten thousand times with very small refractive index change. It is shown that 8.5 pairs DBR at 460 nm has a reflectivity of about 95%, and the driving voltage is 8.2 V at the current density of 100 mA cm-2 . Then, a transparent organic light-emitting diode with integrated bottom conductive DBR are fabricated to confirm the functionality of light regulation. Our results confirm that integrated optoelectronic devices with DBR as reflector can be achieved with low operating voltage.
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