Abstract
Perovskite light-emitting diodes (PeLEDs) have attracted tremendous attention due to their ideal optoelectronic properties, such as high color purity, high fluorescence quantum yield, and tunable light color. The perovskite layer plays a decisive role in the performance of PeLEDs and the solvent engineering of the perovskite layer is the key technological breakthrough in preparing high quality films. In this study, we have proposed the strategy of adding different amounts of solvents to the perovskite precursor solution to optimize the morphology of perovskite films and device performance. As a result, with the decreasing concentration of perovskite precursor solution, the perovskite film morphology is smoother and more favorable for carrier injection and combing, which induces an enhanced external quantum efficiency. The maximum luminance of PeLEDs was increased from 1667 cd/m2 to 9857 cd/m2 and the maximum current efficiency was increased from 6.7 cd/A to 19 cd/A. This work provides a trend to achieve improved film morphology and device performance for perovskite optoelectronic devices.
Highlights
Perovskite light-emitting diodes (PeLEDs) have attracted tremendous attention due to their ideal optoelectronic properties, such as high color purity, high fluorescence quantum yield, and tunable light color [1,2,3]
The performance of PeLEDs increased dramatically [4,5,6,7], which was mainly induced by the improved perovskite layer quality [8,9,10]
We have investigated the effect of the perovskite precursor concentration on film crystallization and device performance
Summary
Perovskite light-emitting diodes (PeLEDs) have attracted tremendous attention due to their ideal optoelectronic properties, such as high color purity, high fluorescence quantum yield, and tunable light color [1,2,3]. Several strategies have been utilized to achieve the high quality perovskite thin films, for example, through interfacial modification to improve the surface properties [11,12,13], through different solvents or mixed solvents to optimize the crystallinity of the films [14,15,16], or the use of additives to passivate the film defects [17,18]. In 2018, Gao et al, obtained thin films with a smooth surface, high crystallinity, and low defect density by using dimethyl sulfoxide (DMSO) and MACl synergistically, and adding these two additives to the perovskite precursor solution [19]. In 2019, Meng et al, improved the crystallinity and carrier transport of perovskite films by optimizing both the dissolving solvent and the anti-solvent with
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