Room temperature preparation of highly stable cesium lead halide perovskite nanocrystals by ligand modification for white light-emitting diodes

Zhang, Yu; Li, Guishun; She, Changkun; Liu, Shaohua; Yue, Fangyu; Jing, Chengbin; Cheng, Ya; Chu, Junhao

doi:10.1007/s12274-021-3283-5

Cited by 36 publications

(23 citation statements)

References 46 publications

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“…Lead halide perovskites have attracted extensive attention in the fields of photovoltaic devices, X-ray detectors, solar cell, and solid-state lighting, among others, because of their unique properties such as tunable band gaps and long carrier diffusion lengths. − However, because of the poor stability of lead halide perovskites, their inherent superiorities are limited to be fully realized in practical applications . Elemental replacement schemes are widely adopted to improve their stability while tuning their optical properties to meet device application requirements. , A specific strategy is to simultaneously replace two lead ions with a monovalent ion and a trivalent ion to form a three-dimensional double perovskite Cs 2 M I M III X 6 (M I = Ag + , Na + , K + , M III = Bi 3+ , In 3+ , Sb 3+ , X = Cl – , Br – , I – ), − which can alleviate certain stability issues while maintaining the three-dimensional (3D) perovskite structure and charge neutrality.…”

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confidence: 99%

Efficient Orange Emission in Mn²⁺-Doped Cs₃Cd₂Cl₇ Perovskites with Excellent Stability

Gao

Han

Wei

et al. 2022

J. Phys. Chem. Lett.

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Low-dimensional metal halides are attractive for applications in photodetectors, solid-state lighting, and solar cells, but poor stability is an obstacle that must be overcome in commercial applications. Herein, we successfully synthesized a Ruddlesden−Popper (RP)phased perovskite Mn 2+ :Cs 3 Cd 2 Cl 7 with high photoluminescence quantum yield (PLQY) and outstanding thermal and environmental stability by a solvothermal method. The pristine sample Cs 3 Cd 2 Cl 7 exhibits a weak cyan broad emission centered at 510 nm with a low PLQY of ∼4%. Once Mn 2+ ions are introduced into the host lattice, a bright orange emission peaking at 580 nm with a high PLQY of ∼74% was achieved, which is attributed to the efficient energy transfer from the host to Mn 2+ ions and thus results in the 4 T 1 → 6 A 1 radiation transition of Mn 2+ ions. The photoluminescence (PL) intensity and environmental stability of Mn 2+ :Cs 3 Cd 2 Cl 7 can be further improved through A-site Rb alloying. Finally, an orange LED with outstanding color stability was fabricated on the basis of the Mn 2+ :Cs 3 Cd 2 Cl 7 . Our work successfully elucidates that dopant plays an integral role in tailoring optical properties.

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confidence: 99%

Efficient Orange Emission in Mn²⁺-Doped Cs₃Cd₂Cl₇ Perovskites with Excellent Stability

Gao

Han

Wei

et al. 2022

J. Phys. Chem. Lett.

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“…Based on these results, we propose a passivation mechanism of defects ( Figure 3A ). In the pristine Mn: CsPbCl 3 perovskites, there are various structure defects (such as chloride vacancy) at the surface of the NCs ( Yang et al, 2020 ) ( Zhang Y. et al, 2021 ). After the addition of TBA, the under-coordinated Pb ions in the perovskite NCs form Pb–S bonds with the S atoms of the thiophene in TBA, thus passivating the surface defects and decreasing non-radiative recombination, enabling the material to improve its performance.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, compared with the organic–inorganic hybrid methylamine lead halide perovskite, they have higher light, thermal, and humidity stability, which all have spurred their applications in solar cells, photodetectors, light-emitting diodes, etc ( Liu Y. et al, 2018 ; Lu et al, 2018 ). Among all inorganic lead perovskite materials, the photoluminescence quantum yields (PLQYs) of the green CsPbBr 3 and red CsPbI 3 NCs have reached above 90% ( Zhang et al, 2018 ; Zhang et al, 2021 Y. ), but the PLQY of blue–violet emission CsPbCl 3 NCs is relatively low.…”

Section: Introductionmentioning

confidence: 99%

Thiophene Derivatives as Ligands for Highly Luminescent and Stable Manganese-Doped CsPbCl3 Nanocrystals

Wang

Gao

et al. 2022

Front. Chem.

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Ligands on the surface of perovskite nanocrystals are important to stabilize the nanocrystal structure. However, the research of ligands on Mn2+ ion-doped CsPbCl3 nanocrystals (Mn: CsPbCl3 NCs), a promising candidate family for the lightning community, is relatively rare. Here, we demonstrate a new ligand modification strategy for preparing high-quality Mn: CsPbCl3 NCs by a simple hot-injection method. Thiophene derivative, for the first time, is applied as ligands for perovskite nanocrystals. The new ligands of thiophene derivatives passivate defects on the surface of NCs and enhance optical properties, originating from the sulfur in thiophene additives binding to the uncoordinated lead ions. The photoluminescence quantum yield of the modified Mn: CsPbCl3 NCs is 93% in comparison with 46% of the pristine counterparts, whose value is the highest to date for ligand-modified Mn: CsPbCl3 NCs. Meanwhile, the thermal, storage, and purification stability are also significantly improved. The performance of related LEDs is also investigated.

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“…Similarly, Zhang et al synthesized CsPbBr 3 NCs by introducing a double-terminal ligand 4,4′-azobis(4cyanovalericacid) (CA) replacing oleic acid (OA) ligand at room temperature. They achieved a QY of 72% (Zhang et al, 2021). The white LED device was fabricated by using greenemitting CsPbBr 3 -CA, commercial red-emitting K 2 SiF 6 :Mn 4+ mixed with silicone resin B and silicone resin A with the ratio of 1:1 onto a blue LED chip (460 nm) and sintered for 2 h at 120 °C in an oven.…”

Section: Utilization Of Metal Halide Perovskites In Wled Applications...mentioning

confidence: 99%

Recent Progress and Prospects on Metal Halide Perovskite Nanocrystals as Color Converters in the Fabrication of White Light-Emitting Diodes

Mohapatra

Kar

Bhaumik

2022

Front. Electron. Mater

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Recently, metal-halide perovskite nanocrystals (NCs) have shown major development and have attracted substantial interest in a wide range of applications, such as light-emitting diodes (LEDs), solar cells, lasers, and photodetectors due to their attractive properties, such as superior PL emission, a wider range of color tunability, narrow emission spectra, better color purity, low cost, easy solution-processability, and so on. In the past, many color-converting materials, such as III-nitrides, organics, polymers, metal chalcogenides, were investigated for solid-state lighting (SSL) white light-emitting diodes (WLEDs). Still, they suffer from issues such as low stability, low color rendering index (CRI), high correlated color temperature (CCT), low luminous efficiency (LE), and high cost. In this sense, metal-halide perovskite NCs exhibit a better color gamut compared with conventional lighting sources, and production costs are comparatively cheaper. Such materials may offer an upcoming substitute for future color-converting WLEDs. In this review, we discuss the metal halide perovskite NCs and their synthesis protocols. Then we elaborate on the recent progress of halide perovskite NCs as a conversion layer in the application of WLEDs.

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Room temperature preparation of highly stable cesium lead halide perovskite nanocrystals by ligand modification for white light-emitting diodes

Cited by 36 publications

References 46 publications

Efficient Orange Emission in Mn²⁺-Doped Cs₃Cd₂Cl₇ Perovskites with Excellent Stability

Efficient Orange Emission in Mn²⁺-Doped Cs₃Cd₂Cl₇ Perovskites with Excellent Stability

Thiophene Derivatives as Ligands for Highly Luminescent and Stable Manganese-Doped CsPbCl3 Nanocrystals

Recent Progress and Prospects on Metal Halide Perovskite Nanocrystals as Color Converters in the Fabrication of White Light-Emitting Diodes

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Room temperature preparation of highly stable cesium lead halide perovskite nanocrystals by ligand modification for white light-emitting diodes

Cited by 36 publications

References 46 publications

Efficient Orange Emission in Mn2+-Doped Cs3Cd2Cl7 Perovskites with Excellent Stability

Efficient Orange Emission in Mn2+-Doped Cs3Cd2Cl7 Perovskites with Excellent Stability

Thiophene Derivatives as Ligands for Highly Luminescent and Stable Manganese-Doped CsPbCl3 Nanocrystals

Recent Progress and Prospects on Metal Halide Perovskite Nanocrystals as Color Converters in the Fabrication of White Light-Emitting Diodes

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Efficient Orange Emission in Mn²⁺-Doped Cs₃Cd₂Cl₇ Perovskites with Excellent Stability

Efficient Orange Emission in Mn²⁺-Doped Cs₃Cd₂Cl₇ Perovskites with Excellent Stability