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  Modulation of recombination zone position for quasi-two-dimensional blue perovskite light-emitting diodes with efficiency exceeding 5%
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  In recent years, substantial progress has been made in developing perovskite light-emitting diodes with near-infrared, red and green emissions and over 20% 
  external quantum efficiency. However, the development of perovskite light-emitting diodes with blue emission remains a great challenge, which retards 
  further development of full-color displays and white-light illumination based on perovskite emissive materials. Here, firstly, through composition and 
  dimensional engineering, we prepare quasi-two-dimensional perovskite thin films with improved blue emission, taking advantages of reduced trap density and 
  enhanced photoluminescence quantum yield. Secondly, we find a vertically non-uniform distribution of perovskite crystals in the PEDOT:PSS/perovskite hybrid 
  film