Highly Stable Cesium Lead Halide Perovskite Nanocrystals through in Situ Lead Halide Inorganic Passivation

Woo, Ju Yeon; Kim, Young‐Sik; Bae, Ji‐Hong; Kim, Tae Gun; Kim, Jeong Won; Lee, Dongkyu; Jeong, Sohee

doi:10.1021/acs.chemmater.7b02669

Cited by 324 publications

(392 citation statements)

References 37 publications

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“…Importantly, while this paper was under revision, J. Y. Woo, et al 34 reported an increased PL and stability via surface passivation of CsPbBr3 NCs by adding ZnBr2 into the reaction flask. We cannot rule out that a similar mechanism is at play in our post-synthesis treatment.…”

Section: Both Cspbx3mentioning

confidence: 90%

Near-Unity Photoluminescence Quantum Yield in CsPbBr₃ Nanocrystal Solid-State Films via Postsynthesis Treatment with Lead Bromide

et al. 2017

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Metal halide perovskite nanocrystals (NCs) possess high photoluminescence (PL) quantum yield (PL) and color tunability. Yet, until now, it has been difficult to maintain the high PL observed in solution in spin-coated films. Here, we report a novel CsPbBr3 NCs room-temperature synthesis based on Cs acetate, which displays near-unity PL in solid-state films upon post-synthetic treatment with lead bromide. The as-synthesized NCs show a PL of 80% in spincoated films but the post-synthesis treatment further enhances the efficiency >95%. The high PL is further confirmed by the monomolecular decay of the PL (5.8 ns) indicating a nearly complete suppression of non-radiative channels. The obtained films demonstrate high stability in air and require around 3 weeks to decrease to half the initial PL value.

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Section: Both Cspbx3mentioning

confidence: 90%

Near-Unity Photoluminescence Quantum Yield in CsPbBr₃ Nanocrystal Solid-State Films via Postsynthesis Treatment with Lead Bromide

et al. 2017

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“…On the contrary, the Pb 4f peaks of in situ passivated NPLs can hardly be fitted with two peaks, which blue shift to higher BEs of 143.05 and 138.2 eV, corresponding with the Pb−Br bonding well. These results imply that, with such an in situ passivation strategy, the V Br is eliminated succcessfully, 28 resulting into fewer nonradiative recombination defects. As a result, 7-fold improvement of the QY is achieved, which changes from 18% to 96% ( Figure S2).…”

mentioning

confidence: 86%

In Situ Passivation of PbBr₆^4– Octahedra toward Blue Luminescent CsPbBr₃ Nanoplatelets with Near 100% Absolute Quantum Yield

et al. 2018

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Recently, the pursuit of high photoluminescence quantum yields (PLQYs) for blue emission in perovskite nanocrystals (NCs) has attracted increased attention because the QY of blue NCs lags behind those of green and red ones severely, which is fatal for three-primary-color displays. Here, we propose an in situ PbBr 6 4− octahedra passivation strategy to achieve a 96% absolute QY for the ultrapure (line width = 12 nm) blue emission from CsPbBr 3 nanoplatelets (NPLs), and both values rank first among perovskite NCs with blue emission. From the aspect of constructing intact PbBr 6 4− octahedra, additional Br − was introduced to drive the ionic equilibrium to form intact Pb−Br octahedra. The reduced Br vacancy and inhibited nonradiative recombination processes are well proved by reduced Urbach energy, increased Pb−Br bonds, and slower transient absorption delay. Blue light-emitting diodes (LEDs) using NPLs were fabricated, and a high external quantum efficiency (EQE) of 0.124% with an emission line width of ∼12 nm was realized. This work will provide good references to break the "blue-wall" in perovskite NCs.

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“…Woo et al. reported situ synthesis approach to obtain long stability CsPbBr 3 NCs by metal halides passivation under ambient conditions . Lou also demonstrated that anion exchange of CsPbX 3 NCs can be used to synthesize CsPbBr 3 @NH 4 Br nanocomposites with good water resistance and thermal stability …”

Section: Applications Of Cspbx3‐ncsmentioning

confidence: 90%

All‐Inorganic Perovskite Nanocrystals‐Based Light Emitting Diodes and Solar Cells

Xia

Wei

et al. 2018

ChemNanoMat

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All‐inorganic perovskite nanocrystals have attracted much attention in recent years due to their long stability, spectral tunability, suitable bandgap, long carrier diffusion length and high photoluminescence quantum yield (PLQY). Their excellent optical properties and stability make them suitable candidates for optoelectronic devices. In this review, we first provide an up‐to‐date review on the synthesis of all‐inorganic NCs, such as hot‐injection, room‐temperature, ultrasonication, solvothermal, fast microwave‐assisted and amine‐free methods. In addition, recent research progress of optoelectronic applications in light emitting diodes and solar cells is presented. Finally, we show the new challenges and give suggestions to make a broad range of applications in the near future.

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Highly Stable Cesium Lead Halide Perovskite Nanocrystals through in Situ Lead Halide Inorganic Passivation

Cited by 324 publications

References 37 publications

Near-Unity Photoluminescence Quantum Yield in CsPbBr₃ Nanocrystal Solid-State Films via Postsynthesis Treatment with Lead Bromide

Near-Unity Photoluminescence Quantum Yield in CsPbBr₃ Nanocrystal Solid-State Films via Postsynthesis Treatment with Lead Bromide

In Situ Passivation of PbBr₆^4– Octahedra toward Blue Luminescent CsPbBr₃ Nanoplatelets with Near 100% Absolute Quantum Yield

All‐Inorganic Perovskite Nanocrystals‐Based Light Emitting Diodes and Solar Cells

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Highly Stable Cesium Lead Halide Perovskite Nanocrystals through in Situ Lead Halide Inorganic Passivation

Cited by 324 publications

References 37 publications

Near-Unity Photoluminescence Quantum Yield in CsPbBr3 Nanocrystal Solid-State Films via Postsynthesis Treatment with Lead Bromide

Near-Unity Photoluminescence Quantum Yield in CsPbBr3 Nanocrystal Solid-State Films via Postsynthesis Treatment with Lead Bromide

In Situ Passivation of PbBr64– Octahedra toward Blue Luminescent CsPbBr3 Nanoplatelets with Near 100% Absolute Quantum Yield

All‐Inorganic Perovskite Nanocrystals‐Based Light Emitting Diodes and Solar Cells

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Near-Unity Photoluminescence Quantum Yield in CsPbBr₃ Nanocrystal Solid-State Films via Postsynthesis Treatment with Lead Bromide

Near-Unity Photoluminescence Quantum Yield in CsPbBr₃ Nanocrystal Solid-State Films via Postsynthesis Treatment with Lead Bromide

In Situ Passivation of PbBr₆^4– Octahedra toward Blue Luminescent CsPbBr₃ Nanoplatelets with Near 100% Absolute Quantum Yield