P‐121: Successive and scalable synthesis of highly stable Cs4PbBr6 perovskite microcrystal by microfluidic system and their application in backlight display

Hung-Chia Wang¹, Zhen Bao¹, Ru-Shi Liu^1,2

• ¹ Department of Chemistry, National Taiwan University, Taipei, Taiwan
• ² Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, Taiwan

All Inorganic CsPbX3 (X = I, Br, Cl) perovskite nanocrystal have attracted immense research interest in recent years, due to their high photoluminescence quantum yield (PLQY). These fascinating features of inorganic nanocrystals have been utilized in light emitting diodes (LEDs) device. However, maintaining the high PLQY in the solid state remains a big challenge. Inorganic mesoporous silica encapsulation of NCs has moderate improvements, but it remains an unsolved problem. Robust and air‐stable Cs4PbBr6microcrystal was another choice in perovskite solid. In this study, we report mass production of Cs4PbBr6 perovskite microcrystal by microfluidic system. To demonstrate the potential application of Cs 4PbBr6 perovskite microcrystal, we fabricated white‐light LEDs based on Cs4PbBr6 and K2SiF6:Mn4+ phosphor. Our white light LED device for backlight display having the NTSC value is 115%.

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