Fast Postmoisture Treatment of Luminescent Perovskite Films for Efficient Light-Emitting Diodes

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Haoran WangXuyong Yang

Abstract

Despite the recent advances in the performance of perovskite light-emitting diodes (PeLEDs), the effects of water on the perovskite emissive layer and its electroluminescence are still unclear, even though it has been previously demonstrated that moisture has a significant impact on the quality of perovskite films in the fabrication process of perovskite solar cells and is a prerequisite for obtaining high-performance PeLEDs. Here, the effects of postmoisture on the luminescent CH3 NH3 PbBr3 (MAPbBr3 ) perovskite films are systematically investigated. It is found that postmoisture treatment can efficiently control the morphology and growth of perovskite films and only a fast moisture exposure at a 60% high relative humidity results in significantly improved crystallinity, carrier lifetime, and photoluminescence quantum yield of perovskite films. With the optimized moisture-treated perovskite films, a high-performance PeLED is fabricated, exhibiting a maximum current efficiency of 20.4 cd A-1 , which is an almost 20-fold enhancement when compared with perovskite films without moisture treatment. The results provide valuable insights into the moisture-assisted growth of luminescent perovskite films and will aid in the development...Continue Reading

References

Mar 19, 2014·Nature Materials·Guichuan XingTze Chien Sum
Aug 5, 2014·Nature Nanotechnology·Zhi-Kuang TanRichard H Friend
Nov 22, 2014·Chemical Communications : Chem Comm·Lidón Gil-EscrigHenk J Bolink
Nov 26, 2014·Advanced Materials·Young-Hoon KimTae-Woo Lee
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