Inorganic Halide Perovskites for Efficient Light-Emitting Diodes

Lead-halide perovskites have transcended photovoltaics. Perovskite light-emitting diodes (PeLEDs) emerge as a new field to leverage on these fascinating semiconductors. Here, we report the first use of completely inorganic CsPbBr3 thin films for enhanced light emission through controlled modulation of the trap density by varying the CsBr-PbBr2 precursor concentration. Although pure CsPbBr3 films can be deposited from equimolar CsBr-PbBr2 and CsBr-rich solutions, strikingly narrow emission line (17 nm), accompanied by elongated radiative lifetimes (3.9 ns) and increased photoluminescence quantum yield (16%), was achieved with the latter. This is translated into the enhanced performance of the resulting PeLED…

• AF
  Agency for Science, Technology and Research

  Award: 112 3510 0003
• NR
  National Research Foundation Singapore

  Awards: NRF-CRP4-2008-03, NRF–CRP14–2014–03
• NT
  Nanyang Technological University

  Award: 112 3510 0003