Abstract
Perovskite light-emitting diodes (PeLEDs) have shown excellent performance in the green and near-infrared spectral regions, with high color purity, efficiency, and brightness. In order to shift the emission wavelength to the blue, compositional engineering (anion mixing) and quantum-confinement engineering (reduced-dimensionality) have been employed. Unfortunately, LED emission profiles shift with increasing driving voltages due to either phase separation or the coexistence of multiple crystal domains. Here we report color-stable sky-blue PeLEDs achieved by enhancing the phase monodispersity of quasi-2D perovskite thin films. We selected cation combinations that modulate the crystallization and layer thickness distribution of the domains. The perovskite films show a record photoluminescence quantum yield of 88% at 477 nm. The corresponding PeLEDs exhibit stable sky-blue emission under high operation voltages. A maximum luminance of 2480 cd m−2 at 490 nm is achieved, fully one order of magnitude higher than the previous record for quasi-2D blue PeLEDs.
Highlights
2, Xiwen Gong 2, Weijie Zhao[1], Jiaxin Zhao[1, 2], Oleksandr Voznyy 2, Jiang Tang 4, Perovskite light-emitting diodes (PeLEDs) have shown excellent performance in the green and near-infrared spectral regions, with high color purity, efficiency, and brightness
We explored a number of additives to tune the emission properties: IPABr, ethylammonium bromide (EABr), n-propylammonium bromide (PABr), and butylammonium bromide (BABr)
We found that only the addition of IPABr resulted in a perovskite product with high photoluminescence quantum yield (PLQY)
Summary
2, Xiwen Gong 2, Weijie Zhao[1], Jiaxin Zhao[1, 2], Oleksandr Voznyy 2, Jiang Tang 4, Perovskite light-emitting diodes (PeLEDs) have shown excellent performance in the green and near-infrared spectral regions, with high color purity, efficiency, and brightness. The as-synthesized perovskite films exhibit a single emission peak and color-stable blue emission (477 nm) with a record PLQY of 88%. The PL peak of a mixed halide perovskite MAPbBr1.5Cl1.5 film shifts from 460 to 515 nm within 10 min of illumination under the same conditions (Fig. 2g).
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