Thermally Activated Delayed Fluorescence from Perovskite‐Derivative CsAgCl<sub>2</sub> Nanocrystals for High‐Resolution X‐Ray Imaging

Lin, Qun; Wang, Zhaoyu; Wei, Yuanhuan; Chen, Yameng; Li, Xiaohan; Liu, Yongsheng; Hong, Maochun

doi:10.1002/adom.202202976

Cited by 9 publications

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“…Though the ternary silver halides exhibit excellent air stability and tunable light emission properties, it is worth noting that silver(I) chlorides possess relatively poor luminescence efficiency and low photoluminescence quantum yields (PLQYs). For instance, the PLQYs of Cs 2 AgCl 3 and CsAgCl 2 are less than 20%, which hampers their practical applications. ,,,− However, to date, the underlying mechanism for this limitation is not yet fully understood. For example, previous studies have primarily focused on the excitonic properties of chain Rb 2 AgX 3 ; , nevertheless, the defect physics of these compounds has not been addressed.…”

Section: Introductionmentioning

confidence: 99%

Improving Optoelectronic Properties of Ternary Silver Chlorides via Defect Engineering

Yang,

Wang,

et al. 2024

J. Phys. Chem. C

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Ternary silver chlorides are highly intriguing due to their distinctive broad emission and large Stokes shift, endowing them as promising candidates for optoelectronic applications. However, practical applications of these materials are seriously hindered by their inferior luminescence efficiency. In this work, to illustrate the underlying microscopic mechanism for these disadvantages in ternary silver chlorides, taking the layer CsAgCl 2 and chain Cs 2 AgCl 3 as typical examples, we investigated the defect and excitonic properties with first-principles calculations combined with experiments. Our results suggest that chlorine vacancies are dominant defects that exhibit low formation energies and create deep energy levels in the band gaps. Moreover, the calculated emission energies (1.85 and 2.35 eV for CsAgCl 2 and Cs 2 AgCl 3 ) of the excitons trapped by the chlorine vacancies (V Cl ) are in line with the main PL peaks observed in the experiment. Due to the deep energy levels, the chlorine vacancy could serve as a trap center for photocarriers, resulting in poor optoelectronic properties. It is predicted that synthesizing p-type compounds in chlorine-rich conditions can reduce the chlorine vacancy concentration on the layer surface for CsAgCl 2 and the chain surface for Cs 2 AgCl 3 and thus significantly improve their optoelectronic properties.

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Section: Introductionmentioning

confidence: 99%

Improving Optoelectronic Properties of Ternary Silver Chlorides via Defect Engineering

Yang,

Wang,

et al. 2024

J. Phys. Chem. C

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Achieving Ultra‐Broadband Near‐Infrared Emission in Cr³⁺‐Activated Cs₂NaScCl₆ Perovskite for Efficient Phosphor‐Converted Light‐Emitting Diodes

Wang,

Chen,

et al. 2023

Advanced Optical Materials

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Ultra‐broadband near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) have great application prospects in research and industrial fields. However, simultaneously achieving highly efficient and ultra‐broad NIR emission in phosphor material remains a challenge. Herein, an ultra‐broadband NIR emission in the range of 800–1200 nm with ultra‐high emission efficiency of up to 64.2% is first achieved by substituting the Sc3+ site in Cs2NaScCl6 perovskite single‐crystal with a Cr3+ ion. By combining the experimental results with first‐principles calculations, an efficient charge transfer sensitization process from host to Cr3+ is found to be the fundamental reason for the ultra‐high NIR emission efficiency. Benefiting from the excellent efficiency and superior chemical resistance to heat and UV radiation, an ultra‐broadband NIR pc‐LED made of this phosphor demonstrates great potential in biomedical imaging, nondestructive testing, and night‐vision devices.

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Dimension Tuning of All‐Inorganic Ag‐Based Metal Halides by Solvent Engineering

Yang,

Wang,

Chen

et al. 2023

Chemistry A European J

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Dimension growth of metal halides is important for its properties and applications. However, such dimension control of the metal halides is rarely reported in the literature and the growth mechanism is not clear yet. A minute difference of solvent properties can tremendously alter the process of nucleation and growth of crystals. Herein, an intriguing phenomenon of dimension tuning for Ag‐based metal halides is reported. The 1D Cs2AgCl3 crystals can be obtained in pure DMF while the 2D CsAgCl2 crystals are obtained in pure DMSO. Both exhibit bright yellow emission, which are derived from self‐trapping excitons (STEs). The photoluminescence quantum yield (PLQY) of Cs2AgCl3 (1D) and CsAgCl2 (2D) are 28.46% and 20.61%, respectively. In order to understand the mechanism of the dimension change, additional solvents (DMAC, DMPU) are also selected to process the precursor for crystal growth. By comparing the functional group, dielectric constant, and donor number among the four solvents, we find the donor number plays the predominant role in nucleation process for Cs2AgCl3 and CsAgCl2. This research reveals the relationship between coordination ability of the solvent and the dimension of metal halides.

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Thermally Activated Delayed Fluorescence from Perovskite‐Derivative CsAgCl₂ Nanocrystals for High‐Resolution X‐Ray Imaging

Abstract: TADF in perovskite-derivatives, and pave a new way to design novel efficient lead-free perovskites luminescent materials.Research data are not shared.

Cited by 9 publications

References 42 publications

Improving Optoelectronic Properties of Ternary Silver Chlorides via Defect Engineering

Improving Optoelectronic Properties of Ternary Silver Chlorides via Defect Engineering

Achieving Ultra‐Broadband Near‐Infrared Emission in Cr³⁺‐Activated Cs₂NaScCl₆ Perovskite for Efficient Phosphor‐Converted Light‐Emitting Diodes

Dimension Tuning of All‐Inorganic Ag‐Based Metal Halides by Solvent Engineering

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Thermally Activated Delayed Fluorescence from Perovskite‐Derivative CsAgCl2 Nanocrystals for High‐Resolution X‐Ray Imaging

Abstract: TADF in perovskite-derivatives, and pave a new way to design novel efficient lead-free perovskites luminescent materials.Research data are not shared.

Cited by 9 publications

References 42 publications

Improving Optoelectronic Properties of Ternary Silver Chlorides via Defect Engineering

Improving Optoelectronic Properties of Ternary Silver Chlorides via Defect Engineering

Achieving Ultra‐Broadband Near‐Infrared Emission in Cr3+‐Activated Cs2NaScCl6 Perovskite for Efficient Phosphor‐Converted Light‐Emitting Diodes

Dimension Tuning of All‐Inorganic Ag‐Based Metal Halides by Solvent Engineering

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Thermally Activated Delayed Fluorescence from Perovskite‐Derivative CsAgCl₂ Nanocrystals for High‐Resolution X‐Ray Imaging

Achieving Ultra‐Broadband Near‐Infrared Emission in Cr³⁺‐Activated Cs₂NaScCl₆ Perovskite for Efficient Phosphor‐Converted Light‐Emitting Diodes