Molecularly Engineered Organic-Inorganic Hybrid Perovskite with Multiple Quantum Well Structure for Multicolored Light-Emitting Diodes

• Published in: Scientific reports 2016-09, Vol.6 (1), p.33546-33546, Article 33546
• Main Authors: Hu, Hongwei, Salim, Teddy, Chen, Bingbing, Lam, Yeng Ming
• Format: Article
• Language: English
• Subjects: 639/301/1019/1020/1089; 639/925/357/404; Ammonia; Color; Emissions; Fabrication; Humanities and Social Sciences; Light emitting diodes; multidisciplinary; Science
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/srep33546

Organic-inorganic hybrid perovskites have the potential to be used as a new class of emitters with tunable emission, high color purity and good ease of fabrication. Recent studies have so far been focused on three-dimensional (3D) perovskites, such as CH 3 NH 3 PbBr 3 and CH 3 NH 3 PbI 3 for green and infrared emission. Here, we explore a new series of hybrid perovskite emitters with a general formula of (C 4 H 9 NH 3 ) 2 (CH 3 NH 3 ) n−1 Pb n I 3n+1 (where n = 1, 2, 3), which possesses a multiple quantum well structure. The quantum well thickness of these materials is adjustable through simple molecular engineering which results in a continuously tunable bandgap and emission spectra. Deep saturated red emission was obtained with a peak external quantum efficiency of 2.29% and a maximum luminance of 214 cd/m 2 . Green and blue LEDs were also demonstrated through halogen substitutions in these hybrid perovskites. We expect these results to open up the way towards high performance perovskite LEDs through molecular-structure engineering of these perovskite emitters.