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In‐Planar‐Electrodes Organic Light‐Emitting Devices for Smart Lighting Applications

Smart lighting systems have earned an irreplaceable position in fields such as health care, communication, and garden cultivation. Inorganic light‐emitting diode (LED) illuminant, as a traditional and well‐developed field, is suitable for smart lighting systems and widely researched. However, smart lighting systems with organic light‐emitting device (OLED) illuminant are rare. The key issue is to fabricate an efficient OLED illuminant with tunable spectra and intensity. Here, in‐planar‐electrodes OLEDs (IPE‐OLEDs), which could be a possible solution to OLED illuminant used in smart lighting systems, is presented. By utilizing Mg:Ag thin film to connect two regular OLEDs with novel electron transporting layer, efficient and easy‐to‐fabricate IPE‐OLEDs with high brightness and low voltage are achieved. The working mechanism of the IPE‐OLEDs is discussed. The IPE‐OLEDs can be easily driven with alternating current signals to independently address each emissive sub‐cell. Thus, the OLED illuminant based on IPE‐OLEDs enables adjustment of color temperature and intensity. To exhibit the features of the fabricated IPE‐OLEDs further, a simple but effective smart lighting system containing IPE‐OLEDs and gas detector is constructed, which could be used in the mining industry.