Volume 1 Issue 4
December  2022
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Junjie Wang, Danyang Li, Jian Wang, Junbiao Peng. Efficient emission of quasi-two-dimensional perovskite films cast by inkjet printing for pixeldefined matrix light-emitting diodes[J]. Materials Futures, 2022, 1(4): 045301. doi: 10.1088/2752-5724/ac9b2d
Citation: Junjie Wang, Danyang Li, Jian Wang, Junbiao Peng. Efficient emission of quasi-two-dimensional perovskite films cast by inkjet printing for pixeldefined matrix light-emitting diodes[J]. Materials Futures, 2022, 1(4): 045301. doi: 10.1088/2752-5724/ac9b2d
Paper •

Efficient emission of quasi-two-dimensional perovskite films cast by inkjet printing for pixeldefined matrix light-emitting diodes

© 2022 The Author(s). Published by IOP Publishing Ltd on behalf of the Songshan Lake Materials Laboratory
Materials Futures, Volume 1, Number 4
  • Received Date: 2022-08-16
  • Accepted Date: 2022-10-18
  • Publish Date: 2022-11-17
  • Quasi-two-dimensional (quasi-2D) perovskites are promising materials for potential application in light-emitting diodes (LEDs) due to their high exciton binding energy and efficient emission. However, their luminescent performance is limited by the low-n phases that act as quenching luminescence centers. Here, a novel strategy for eliminating low-n phases is proposed based on the doping of strontium bromide (SrBr2) in perovskites, in which SrBr2 is able to manipulate the growth of quasi-2D perovskites during their formation. It was reasonably inferred that SrBr2 readily dissociated strontium ions (Sr2+) in dimethyl sulfoxide solvent, and Sr2+ was preferentially adsorbed around [PbBr6]4− through strong electrostatic interaction between them, leading to a controllable growth of quasi-2D perovskites by appropriately increasing the formation energy of perovskites. It has been experimentally proved that the growth can almost completely eliminate low-n phases of quasi-2D perovskite films, which exhibited remarkably enhanced photoluminescence. A high electroluminescent efficiency matrix green quasi-2D perovskite-LED (PeLED) with a pixel density of 120 pixels per inch fabricated by inkjet printing technique was achieved, exhibiting a peak external quantum efficiency of 13.9%, which is the most efficient matrix green quasi-2D PeLED so far to our knowledge.

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