Deep-blue emissive Cs3Cu2I5 perovskites nanocrystals with 96.6% quantum yield via InI3-assisted synthesis for light-emitting device and fluorescent ink applications

Gao, Fei; Zhu, Xiaonan; Feng, Qiushi; Zhong, Weiheng; Liu, Weizhen; Xu, Haiyang; Liu, Yichun

doi:10.1016/j.nanoen.2022.107270

Cited by 47 publications

(54 citation statements)

References 38 publications

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“…When high-energy photons are absorbed by Cs 3 Cu 2 I 5 NCs, electrons jump from the ground state to the excited state. Meanwhile, when Cs 3 Cu 2 I 5 NCs are excited by UV light, Cu(I)-3d 10 forms Cu(II)-3d 9 , which induces strong Jahn–Teller distortion, expands the lattice, and forms the STE state under the excited state. , The photoexcited electrons are then rapidly relaxed to low-energy states through a strong and ultrafast electron–phonon coupling process, resulting in emission. Similarly, the average lifetime of CsCu 2 I 3 is 2.07 μs.…”

mentioning

confidence: 99%

Unraveling the Phase Transition and Luminescence Tuning of Pb-Free Cs–Cu–I Perovskites Enabled by Reaction Temperature and Polar Solvent

Cui

Zhao

Wang

et al. 2022

J. Phys. Chem. Lett.

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Ternary Pb-free Cs−Cu−I perovskites have attracted widespread attention because of their excellent optical properties and environmentally friendly advantages. Herein, two different Pb-free ternary Cs 3 Cu 2 I 5 nanocrystals (NCs) and CsCu 2 I 3 microrods (MRs) were synthesized via a heating method. The phase and morphology transition from blue emission of Cs 3 Cu 2 I 5 NCs to yellow emission of CsCu 2 I 3 MRs could be tuned effectively by manipulating the reaction temperature, decreasing the maximum photoluminescence quantum yields (PLQYs) from 82.7% to ∼10%. More interestingly, the Cs 3 Cu 2 I 5 NCs could self-assemble into stacking chains, which exhibited a strong dependence on the polarity of solvents. In addition, it was demonstrated that the rapid phase transition and luminescence tuning between Cs 3 Cu 2 I 5 and CsCu 2 I 3 films took only a few seconds by direct heating or exposure to the polar solvent. This work may deepen the understanding of the phase transition process in Cu-based perovskites and provide a fluorescence material with a short switching time for anticounterfeiting applications.

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mentioning

confidence: 99%

Unraveling the Phase Transition and Luminescence Tuning of Pb-Free Cs–Cu–I Perovskites Enabled by Reaction Temperature and Polar Solvent

Cui

Zhao

Wang

et al. 2022

J. Phys. Chem. Lett.

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“…Test calculations indicate that the G-type antiferromagnetic (AFM) state of c-CsMnCl 3 is the most stable, and similarly, r-CsMnCl 3 adopts an AFM configuration, in which the unpaired 3d 5 electrons of nearest-neighbor Mn 2+ cations have opposite spins. Figure 5a,b shows the band structures and projected densities-of-states (PDOS) of these two AFM structures.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…However, red-emissive CsPbI 3 NCs (emission maximum ∼620–690 nm) have proven to be inherently phase unstable. Moreover, the toxicity of water-soluble Pb 2+ in LHP NCs has recently triggered the search and subsequent discovery of Pb-free metal-halide NCs, typically based on Bi, Sb, and Cu, with a maximum PLQY of 97% for Cs 3 Cu 2 I 5 in the deep-blue spectral region. , Nevertheless, none of the reported Pb-free NCs have so far simultaneously exhibited high PLQY and stable red emission beyond 650 nm.…”

Section: Introductionmentioning

confidence: 99%

Role of CsMnCl₃ Nanocrystal Structure on Its Luminescence Properties

Matuhina

Grandhi

Pan

et al. 2023

ACS Appl. Nano Mater.

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Cesium manganese chloride (CsMnCl 3 ) nanocrystals (NCs) have recently been recognized as potential lead-free perovskite candidates for red emission. To ascertain how the luminescence properties depend on the NC structures formed under different synthesis conditions, we synthesized CsMnCl 3 NCs in two polymorphic structures, namely, cubic (c-CsMnCl 3 ) and rhombohedral (r-CsMnCl 3 ), by tuning the reaction temperature of a hot injection route. c-CsMnCl 3 NCs are found to be nonemissive, whereas r-CsMnCl 3 NCs exhibit red emission at 670 nm with a photoluminescence quantum yield of 40%. Density functional theory calculations reveal an indirect band gap for c-CsMnCl 3 �the electronic transitions between valence and conduction band edges are prohibited by orbital symmetry and spin. Conversely, r-CsMnCl 3 NCs possess a direct band gap. Further, transient absorption measurements suggest self-trapped exciton formation in r-CsMnCl 3 NCs, which contributes to their emission characteristics. Our proof-of-concept demonstration of photocurrent generated from the emitting r-CsMnCl 3 NCs indicates their suitability for luminescent solar concentrator applications. The findings of this work highlight the importance of understanding structure-luminescence relationship of emerging lead-free perovskites providing design criteria for red-emitting materials.

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“…The as-fabricated devices exhibited a halflifetime of more than 300 hours under a driving current of 10 mA, which is comparable to that of the most advanced lead(II)-based perovskite LED device. 38 In addition to the dark blue PeLEDs of Cs 3 Cu 2 I 5 summarized above, CsCu 2 I 3 is another ternary copper halide developed intensively, which exhibits yellow emission. Shi et al first proved that ternary copper halide Cs 3 Cu 2 I 5 nanocrystals (NCs) have excellent hydrochromic properties.…”

Section: Cu(i)-based Electrically Driven Ledsmentioning

confidence: 93%

“…The as-fabricated devices exhibited a half-lifetime of more than 300 hours under a driving current of 10 mA, which is comparable to that of the most advanced lead( ii )-based perovskite LED device. 38…”

Section: Cu(i)-based Electrically Driven Ledsmentioning

confidence: 99%

Advances in electrically driven light-emitting diodes based on lead-free metal halides

Xue

Yao

et al. 2023

Chem. Commun.

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Deep-blue emissive Cs3Cu2I5 perovskites nanocrystals with 96.6% quantum yield via InI3-assisted synthesis for light-emitting device and fluorescent ink applications

Cited by 47 publications

References 38 publications

Unraveling the Phase Transition and Luminescence Tuning of Pb-Free Cs–Cu–I Perovskites Enabled by Reaction Temperature and Polar Solvent

Unraveling the Phase Transition and Luminescence Tuning of Pb-Free Cs–Cu–I Perovskites Enabled by Reaction Temperature and Polar Solvent

Role of CsMnCl₃ Nanocrystal Structure on Its Luminescence Properties

Advances in electrically driven light-emitting diodes based on lead-free metal halides

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Deep-blue emissive Cs3Cu2I5 perovskites nanocrystals with 96.6% quantum yield via InI3-assisted synthesis for light-emitting device and fluorescent ink applications

Cited by 47 publications

References 38 publications

Unraveling the Phase Transition and Luminescence Tuning of Pb-Free Cs–Cu–I Perovskites Enabled by Reaction Temperature and Polar Solvent

Unraveling the Phase Transition and Luminescence Tuning of Pb-Free Cs–Cu–I Perovskites Enabled by Reaction Temperature and Polar Solvent

Role of CsMnCl3 Nanocrystal Structure on Its Luminescence Properties

Advances in electrically driven light-emitting diodes based on lead-free metal halides

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Role of CsMnCl₃ Nanocrystal Structure on Its Luminescence Properties