Robust, Brighter Red Emission from CsPbI<sub>3</sub> Perovskite Nanocrystals via Endotaxial Protection

Grandhi, G. Krishnamurthy; Viswanath, Noolu Srinivasa Manikanta; In, Jun Hyeong; Cho, Han Bin; Im, Won Bin

doi:10.1021/acs.jpclett.0c00522

Cited by 26 publications

(34 citation statements)

References 29 publications

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“…[ 152 ] Similarly, brightly red‐emitting CsPbI 3 –Cs 4 PbI 6 hybrid PNCs preserved nearly 65% and 60% of their initial PLQY at 150 °C and after thermal annealing at 100 °C for 6 h, respectively. [ 154 ] In the PNC–matrix composites, the individual PNCs are spatially separated from each other by the matrix, which prevents the PNC agglomeration under the continuous thermal annealing and hence preserves the emission properties of the PNCs.…”

Section: Emission Thermal Quenchingmentioning

confidence: 99%

Halide Perovskite Nanocrystal Emitters

Liu

Grandhi

Matta

et al. 2021

Advanced Photonics Research

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The increasing attention on halide perovskite nanocrystals (PNCs) stems from their outstanding optoelectronic properties, especially the intriguing photoluminescence (PL) features. The high photoluminescence quantum yields (up to unity) of PNCs, and the tunability of their optical bandgaps by composition engineering and quantum confinement effects, account for the demonstrated great potential in several optoelectronic applications, such as light‐emitting diodes (LEDs), phosphors, lasers, and photodetectors. However, despite the rapid growth of this research field, several questions are still left unanswered and there is room for further improving the luminescence performance, particularly for emerging lead‐free PNC compositions. Herein, the recent advances in the light emission phenomena in PNCs are discussed. A special focus is given to the correlation between PL and phase transition, the dual‐color emission, the tunability of the PL toward near‐infrared (NIR), and the thermal quenching effect. The key research findings on LEDs, the major application of perovskite‐based nanoscale emitters, are also outlined. Finally, the view on the most urgent challenges to be addressed is provided, with the intent of promoting a more profound understanding of PNC emission‐related phenomena in the future.

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Section: Emission Thermal Quenchingmentioning

confidence: 99%

Halide Perovskite Nanocrystal Emitters

Liu

Grandhi

Matta

et al. 2021

Advanced Photonics Research

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“…The spacing of 11 Å does not match any of the lattice planes of either the CsPbI 3 or Cs 4 PbI 6 phases. These larger lattice fringes are known as Moiré fringes, and they were formed as a result of overlap of the lattices of the guest (CsPbI 3 ) particles and the host (Cs 4 PbI 6 ) matrix . Furthermore, the TEM elemental mapping (see Figure S4 in the Supporting Information) shows Yb distributed homogeneously among these NCs.…”

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confidence: 99%

“…Therefore, the sensitive CsPbI 3 NCs are isolated from water vapor and oxygen to hold excellent optical performance under the atmospheric environment for several months. Furthermore, the Gibbs free energy of CsPb/YbI 3 can be decreased, because of the Cs 4 PbI 6 encapsulation . This means the activation energy barrier for the phase transition (from α-CsPbI 3 transfer to non-optically active phase) becomes higher.…”

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confidence: 99%

Yb²⁺-Alloyed Cs₄PbI₆–CsPbI₃ Perovskite Nanocomposites for Efficient and Stable Pure-Red Emission

Dai

Chen

Yang

2021

J. Phys. Chem. Lett.

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A series of Yb 2+ -alloyed CsPb 1−x Yb x I 3 (x = 0, 0.2, 0.4, 0.6) perovskite nanocrystals (NCs): are synthesized by a modified hot-injection method. Yb 2+ alloying induced a blue shift of photoluminescence (PL) spectra. In particular, when x = 0.6, the perovskite NCs exhibit pure-red emission with PL centered at 638 nm. Furthermore, the perovskite NCs with pure-red emission exhibit enhanced air and thermal stability, compared to pure CsPbI 3 NCs. The enhanced stability can be assigned to the formation Cs 4 PbI 6 −CsPbI 3 :Yb composites. Charge-carrier dynamics study indicates that the Cs 4 PbI 6 −CsPbI 3 :Yb composites exhibit ultrafast hot-carrier cooling processes, which could break the Auger reheating effect. These properties suggest the Yb 2+ alloyed CsPbI 3 perovskite NCs have great potential for high-performance pure-red light-emitting diodes.

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“…[99] Hybrid LHP NCs were also synthesized via the HI approach. [100] Very recently, highly stable CsPbBr 3 / ZnS core/shell NCs were successfully synthesized by annealing the CsPbBr 3 NCs with a ZnS precursor in the presence of oleylammonium bromide salt. [101] Usually, lower temperatures produce quantum-confined 2D nanoplatelets (NPLs) because of anisotropic growth, whereas higher temperatures produce weakly confined 3D nanocubes.…”

Section: Mhp Synthesismentioning

confidence: 99%

Section: Metal Halide Perovskite Nanocrystals (Mhps)mentioning

confidence: 99%

Metal Halide Perovskite@Metal‐Organic Framework Hybrids: Synthesis, Design, Properties, and Applications

Yadav

Grandhi

Dubal

et al. 2020

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FETs), light-emitting diodes (LED), solar cells, water splitting, and water purification owing to their exceptional electronic and optical properties such as extreme absorption coefficient, robust photoluminescence, extended carrier diffusion length, ambipolar charge transport, defect tolerant nature, and similar effective mass value. [1-9] Mitzi et al. reported tin-based perovskites as a new family of semiconductors in 1994. [10] However, real attention was captured only in 2009, when Kojima et al. successfully used them in solar cells as a sensitizer in a dye-sensitized solar cell (DSSC) with the power conversion efficiency (PCE) of 3.8%. [11] Recently, other groups demonstrated halide perovskites as solid-state PSCs with 10% efficiency, which provided considerable impetus for the field, together with the recent spectacular rise in PCE (25.2% certified). [12,13] Apart from solar cells, perovskite halides have been successfully implemented in optoelectronic devices such as FETs and LEDs. [14-17] However, the structural features of perovskites experience swift degradation under different stress conditions such as moisture, UV light, oxygen, and high temperature, which limits their practical applications. [18] This drawback can be tackled by stabilizing halide perovskites by various approaches such as integration of multiple capping agents/stabilizers and encapsulation into various porous materials like polymer matrices, polymethyl Metal halide perovskites (MHPs) have excellent optoelectronic and photovoltaic applications because of their cost-effectiveness, tunable emission, high photoluminescence quantum yields, and excellent charge carrier properties. However, the potential applications of the entire MHP family are facing a major challenge arising from its weak resistance to moisture, polar solvents, temperature, and light exposure. A viable strategy to enhance the stability of MHPs could lie in their incorporation into a porous template. Metal-organic frameworks (MOFs) have outstanding properties, with a unique network of ordered/functional pores, which render them promising for functioning as such a template, accommodating a wide range of MHPs to the nanosized region, alongside minimizing particle aggregation and enhancing the stability of the entrapped species. This review highlights recent advances in design strategies, synthesis, characterization, and properties of various hybrids of MOFs with MHPs. Particular attention is paid to a critical review of the emergence of MHP@MOF for comprehensive studies of next-generation materials for various technological applications including sensors, photocatalysis, encryption/decryption, light-emitting diodes, and solar cells. Finally, by summarizing the state-of-the-art, some promising future applications of reported hybrids are proposed. Considering the inherent correlation and synergic functionalities of MHPs and MOFs, further advancement; new functional materials; and applications can be achieved through designing MHP@MOF hybrids.

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Robust, Brighter Red Emission from CsPbI₃ Perovskite Nanocrystals via Endotaxial Protection

Cited by 26 publications

References 29 publications

Halide Perovskite Nanocrystal Emitters

Halide Perovskite Nanocrystal Emitters

Yb²⁺-Alloyed Cs₄PbI₆–CsPbI₃ Perovskite Nanocomposites for Efficient and Stable Pure-Red Emission

Metal Halide Perovskite@Metal‐Organic Framework Hybrids: Synthesis, Design, Properties, and Applications

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Robust, Brighter Red Emission from CsPbI3 Perovskite Nanocrystals via Endotaxial Protection

Cited by 26 publications

References 29 publications

Halide Perovskite Nanocrystal Emitters

Halide Perovskite Nanocrystal Emitters

Yb2+-Alloyed Cs4PbI6–CsPbI3 Perovskite Nanocomposites for Efficient and Stable Pure-Red Emission

Metal Halide Perovskite@Metal‐Organic Framework Hybrids: Synthesis, Design, Properties, and Applications

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Robust, Brighter Red Emission from CsPbI₃ Perovskite Nanocrystals via Endotaxial Protection

Yb²⁺-Alloyed Cs₄PbI₆–CsPbI₃ Perovskite Nanocomposites for Efficient and Stable Pure-Red Emission