Abstract
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 CH3NH3PbBr3 and CH3NH3PbI3 for green and infrared emission. Here, we explore a new series of hybrid perovskite emitters with a general formula of (C4H9NH3)2(CH3NH3)n−1PbnI3n+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/m2. 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.
Highlights
Despite recent rigorous explorations of 3D perovskites, the first perovskite-based LED demonstrated in 1994 was based on layered hybrid perovskite ((C6H5C2H4NH3)2PbI4), which inherently possessed a two-dimensional (2D) quantum well structure[20]
Extending the pioneering work on both 3D and 2D perovskites, we report the first demonstration of room-temperature light-emitting devices based on layered perovskites possessing multiple quantum well (MQW) structure
The generic chemical formula for these layered hybrid perovskites is (C4H9NH3)2(CH3NH3)n−1PbnI3n+1, where n represents the number of octahedra layers within each quantum well
Summary
Despite recent rigorous explorations of 3D perovskites, the first perovskite-based LED demonstrated in 1994 was based on layered hybrid perovskite ((C6H5C2H4NH3)2PbI4), which inherently possessed a two-dimensional (2D) quantum well structure[20]. Within those quantum wells, electrons and holes are strongly confined in two dimensions rendering a large exciton binding energy and high luminescence yield. Extending the pioneering work on both 3D and 2D perovskites, we report the first demonstration of room-temperature light-emitting devices based on layered perovskites possessing multiple quantum well (MQW) structure. Green and blue LEDs based on MQW perovskite were demonstrated for a solution-processed full-color perovskite display
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