Abstract
Rational engineering of the surface properties of perovskite nanocrystals (PeNCs) is critical to obtain light emitters with simultaneous high photoluminescence efficiency and excellent charge transport properties for light-emitting diodes (LEDs). However, the commonly used lead halide sources make it hard to rationally optimize the surface compositions of the PeNCs. In addition, previously developed ligand engineering strategies for conventional inorganic nanocrystals easily deteriorate surface properties of the PeNCs, bringing additional difficulties in optimizing their optoelectronic properties. In this work, a novel strategy of employing a dual-purpose organic lead source for the synthesis of highly luminescent PeNCs with enhanced charge transport property is developed. Lead naphthenate (Pb(NA)2 ), of which the metal ions work as lead sources while the naphthenate can function as the surface ligands afterward, is explored and the obtained products under different synthesis conditions are comprehensively investigated. Monodispersed cesium lead bromide (CsPbBr3 ) with controllable size and excellent optical properties, showing superior photoluminescence quantum yields up to 80%, is obtained. Based on the simultaneously enhanced electrical properties of the Pb(NA)2 -derived PeNCs, the resultant LEDs demonstrate a high peak external quantum efficiency of 8.44% and a superior maximum luminance of 31759cd cm-2 .
Highlights
(PeNCs) is critical to obtain light emitters with simultaneous high photoluminescence efficiency and excellent charge transport properties for lightemitting diodes (LEDs)
We develop a novel dual-purpose lead source consisting of organic functional groups for controllable synthesis of highly luminescent perovskite nanocrystals (PeNCs) with enhanced charge transport property
It was found that the neat Pb(NA)2 only exhibits strong chemical shifts located at 0.7–1.5 ppm, which can be ascribed to the alkyl hydrogens (Figure S1, Supporting Information), indicating that there are negligible aromatic carboxylic ligands in Pb(NA)2 that we used in our synthesis
Summary
(PeNCs) is critical to obtain light emitters with simultaneous high photoluminescence efficiency and excellent charge transport properties for lightemitting diodes (LEDs). Www.advancedsciencenews.com www.small-journal.com precursors were employed to synthesize the PeNCs.[19,20,21] due to the fixed ratio of lead to halide in the PbX2, it is hard to rationally optimize the surface compositions of the PeNCs, e.g., excess halide ions, which were proven beneficial to the colloidal stability and the optical properties.[22] Nonhalide lead salts, such as lead acetate (Pb(Ac)2), has been explored to separately tune the molar ratios of the lead and halide precursors during the synthesis of PeNCs.[22,23] there is limited contribution from the acetate to the surface properties of the resulting PeNCs. we propose that the alternative nonhalide lead sources originally containing functional ligands would be promising to further advance the colloidal synthesis of PeNCs and ensure high efficiency and superior luminance of the final perovskite LEDs. In this work, we develop a novel dual-purpose lead source consisting of organic functional groups for controllable synthesis of highly luminescent PeNCs with enhanced charge transport property. 8.44% and a superior luminance of 31 759 cd cm−2, which is the highest reported value for green perovskite LEDs based on PeNCs synthesized from hot-injection methods
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