Fast Postmoisture Treatment of Luminescent Perovskite Films for Efficient Light‐Emitting Diodes. Issue 15 (23rd February 2018)

• Record Type: Journal Article
• Authors: Wang, Haoran; Li, Xiaomin; Yuan, Mingjian; Yang, Xuyong
• Is Part Of: Small. Volume 14:Issue 15(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-02-23
• Subjects: electroluminescence -- moisture -- PeLEDs -- perovskite -- water; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201703410
• Languages: English
• ISSNs: 1613-6810

Abstract

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 of high‐performance perovskite light‐emitting devices. Abstract : The effects of postmoisture on the luminescent properties of perovskite films are systematically investigated. With the optimized moisture‐treated perovskite films, the high‐performance perovskite light‐emitting devices (LEDs) are fabricated with a maximum current efficiency of 20.4 cd A −1 ; an almost 20‐fold enhancement compared with the control device. The results will aid in the development of efficient perovskite‐based LEDs.