Application Of Organic-metal Oxides Composites In Infrared Up-conventer Devices

Optical up-converters have attracted a great deal of research interest because of their potential applications in near-infrared (NIR) imaging devices. However, there are some challenges in making inorganic or organic optical up-converter, for example, complexity in fabricating, limited choice of available material, narrow infrared detection range, etc. To solve these problems, this thesis explore a new type of composite materials (MoO3 doped organic molecules TCTA) for the infrared-visible light detection in the near-infrared～1500nm. Integration of this composite material with an Organic Light-Emitting Diode (OLED) device structure was demonstrated.To find the most suitable anode for infrared up-conversion device, this thesis compared ITO conductive glass and FTO conductive glass. The experimental results showed that the ITO is more suitable anode for device fabrication.For hole blocking layer materials,10 nm thickness BCP provides the best device dark current characteristics. Experimental results also showed that the device achieved a good stability under infrared light illumination at a power density less than 2961 mW/cm2.The doping concentration and thickness of the TCTA:MoO3 are optimized for up-converter applications. It is found that the doping concentration 5 wt% and 400 nm thick composite produce the highest signal to noise ratio.In summary, through optimization of the various materials and device structures, this thesis work achieved an optical up-converter device which converts infrared signal to the visible light signal.