Daofu Wu

Chongqing University

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Xiaosheng Tang

Chongqing University

Qiang Huang

Chongqing University of Posts and Telecommunications

Jun’an Lai

Chongqing University

Changqing Tian

Technical Institute of Physics and Chemistry

Yanyi Huang

Yantai University

Kang An

Chongqing University

Yijia Wang

Tianshui Normal University

Linfeng Guo

Tencent (China)

Hongmei Ran

Chongqing University of Posts and Telecommunications

Zixian Wang

Henan University of Science and Technology

Cooperative Institutions

Chongqing University

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Chongqing University of Posts and Telecommunications

Peking University

University of Science and Technology of China

Shanghai Institute of Optics and Fine Mechanics

Southwest University

Zhengzhou University

Huazhong University of Science and Technology

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Lead-free scintillators based on pyridine manganese halide for X-ray imaging

Journal of Luminescence (2022)

Chen Li Jun’an Lai Daofu Wu Qiang Wang Yanjun Bai

10.1016/j.jlumin.2022.119130

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Citations (15)

Optical regulation by localized states of Cu2+ ions with highly sensitive to trap density and thermalization in manganese-doped perovskite nanocrystals

Applied Physics Letters (2024)

Wenxia Zhang Fujia Zeng Yuchan Wang Daofu Wu Guanghao Chen

Mn2+-doped perovskites nanocrystals (NCs) have already been extensively studied in fascinating optical, electronic, and magnetic properties. Such interesting traits make them paid considerable attention in light emitting diodes, solar cells, etc. However, the underlying thermal and photophysical processes governing the overall charge carrier dynamics in Mn-doped NCs are far from clear. Herein, trap concentration and thermalization-dependent optical properties of Mn–Cu co-doped CsPbCl3 NCs were investigated via using steady-state, time-resolved PL spectra, variable-temperature PL spectra, and ultrafast transient absorption spectra. The combined experimental and theoretical studies reveal that Cu2+, as an effective hole trap, can trap the holes from Mn2+ and emit the holes to Mn2+ level at lighter and higher doping, respectively. Moreover, this hole trap is highly thermally sensitive, which is responsible for the abnormal thermal effect of Mn2+ emission with increasing temperature. These findings demonstrate an approach of charge regulation through ion doping, which is meaningful for fabricating efficient photoelectric materials and devices.

Thermalisation

Charge carrier

Photoelectric effect

10.1063/5.0177781

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CCDC 2221621: Experimental Crystal Structure Determination

The Cambridge Structural Database (2023)

Jun’an Lai Daofu Wu Peng He Kang An Yijia Wang

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2dks6z

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Lead-Free Perovskite Cs2xcl6 (X = Hf, Zr, Te) Microcrystals for Photocatalytic Co2 Reduction

SSRN Electronic Journal (2022)

Changqing Tian Qiang Huang Daofu Wu Jun’an Lai Fei Qi

The lead halide perovskites have broad application prospects in the fields of the photoelectronic and photocatalysis. However, their toxicity and stable are the main obstacles restricting their photocatalytic applications. In order to solve these problems, a set of lead-free stable Cs2XCl6 (X = Hf, Zr, Te) perovskite microcrystals were synthesized by a solvothermal solution. The Cs2XCl6 (X = Hf, Zr, Te) perovskite microcrystals were employed as efficient photocatalysts for the conversion of CO2 into CO and CH4 . Among them, the Cs2TeCl6 microcrystals showed the best photocatalytic performance under light irradiation for 3 hours, the yields of CO and CH4 were 284.4 μmol/g, and 48.96 μmol/g, respectively. Our strategy may provide a new idea for the CO2 photoreduction of lead-free perovskites.

10.2139/ssrn.4065722

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Enhanced Performance in Cesium Tellurium Chlorine by Hafnium Alloying for X‐Ray Computed Tomography Imaging

Advanced Optical Materials (2024)

Jun’an Lai Pengjiu Wang Baofeng Zheng Tongtong Xuan Daofu Wu

Abstract The term “light yield” (LY) refers to the ability of scintillator materials to convert high‐energy radiation into visible light. A higher LY corresponds to improved energy and spatial resolution in detectors. The enhancement of scintillator material performance is a crucial aspect of their development. In this study, the Cs 2 TeCl 6 (CTC) double perovskite microcrystals is synthesized, and the broadband yellow emission shows a high degree of matching with the Charge‐coupled Device (CCD). However, the LY of CTC is poor for practical applications in X‐ray imaging. The scintillation performance is significantly enhanced through hafnium alloying. The LY increased from ≈4167 to 38 523 photons/MeV, and the detection limit decreased from 948 to 258 nGy s −1 . The underlying mechanism of Te 4+ ions emission is systematically explored through density function theory (DFT) analysis, along with investigations into pressure‐dependent photoluminescence, temperature‐dependent photoluminescence, and low‐temperature thermoluminescence. Furthermore, a flexible X‐ray scintillator screen with an outstanding high spatial resolution of 15.9 lp mm −1 is successfully fabricated. This work not only represents a substantial advancement in the scintillation performance of Te 4+ ions emission double perovskite microcrystals but also provides an effective strategy for the development of the next generation of halide scintillators.

Hafnium

Tellurium

Caesium

10.1002/adom.202303297

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Dark Current Suppression in Two‐dimensional Histamine Lead Iodine Perovskite Single Crystal for X‐ray Detection and Imaging

Laser & Photonics Review (2024)

Jun’an Lai Sijun Cao Shiji Zhou Peng He Kang An

Abstract Lead halide perovskites have emerged as attractive X‐ray detector materials, owing to properties such as strong X‐ray stopping power, excellent carrier transport, and high sensitivity. Additionally, they can be easily prepared by using solution‐based synthesis approaches. However, traditional 3D (three‐dimensional) perovskites X‐ray detectors have shown limited application due to high dark currents generated under bias voltage as a result of strong ion migration. In this work, an X‐ray detector with a vertical structure device is demonstrated using 2D (two‐dimensional) histamine lead halide perovskite single crystal HAPbI 4 (HPI, HA = histamine). Due to the dielectric screening effect of diamine and the vertical structure of the HPI device, the fabricated detector shows a sensitivity of 7737 µC Gy air −1 cm −2 under a bias voltage of 30 V. Furthermore, the detector shows a sensitivity of 293 µC Gy air −1 cm −2 and detection limit of 51.38 nGy air s −1 without bias voltage, wherein the dark current is almost completely suppressed. All of these properties indicate the X‐ray detection device is a promising candidate for next‐generation optoelectronic applications.

Lead (geology)

10.1002/lpor.202401365

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Environment Friendly and Highly Efficiency Organic Antimony Halide Scintillator for Light Emitting Diode and X-Ray Imaging

Yijia Wang Xiaosheng Tang Jun’an Lai Kang An Daofu Wu

Metal halides with high luminescence property have emerged as novel candidate scintillator for X-ray detection and imaging. However, there are two major reasons (toxicity and poor stability) to restrict their optoelectronic applications. Low-dimensional organic-inorganic halide consisting of heavy metals free composition provides unique optical properties and luminescence applications. Herein, a lead-free zero-dimensional antimony hybrid single crystal-(MPP)2SbCl5 (MPP =Methyltriphenylphosphonium) is developed through facile synthesis with nearly 100% photoluminescence quantum yield peaking at 590 nm. The (MPP)2SbCl5 single crystal exhibited fantastic thermal stability with phase transition temperature of 600 K and air stability with exposure to air at least 6 months. Moreover, single crystals with a product yield of 100% are prepared by an environment-friendly method that is devoid of any toxic solvents and pollution throughout the process. A white light emitting diode device using broad-band emissive single crystal (MPP)3SbCl6 on a blue chip exhibited a pure white light (CRI=93). Meanwhile, a flexible scintillation screen with high light yield of 28000 photon MeV-1, a low detection limit of 532 nGy s-1, and a spatial resolution of 5.4 lp mm-1 was fabricated by (MPP)2SbCl5 single crystal and Polydimethylsiloxane, which indicate fantastic potential of environmental friendly (MPP)2SbCl5 in optoelectronic detection applications.

X-ray detector

10.2139/ssrn.4665324

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Photoluminescence-Tunable organic phosphine cuprous halides clusters for X-ray scintillators and white light emitting diodes

Chemical Engineering Journal (2024)

Jun’an Lai Chen Li Zixian Wang Linfeng Guo Yijia Wang

10.1016/j.cej.2024.153077

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Carbon Dioxide Conversion Synergistically Activated by Dielectric Barrier Discharge Plasma and the CsPbBr₃@TiO₂ Photocatalyst

The Journal of Physical Chemistry Letters (2022)

Qiang Huang Zhiyu Liang Fei Qi Nan Zhang Jiayu Yang

Carbon dioxide utilization activated by the integration of plasma and photocatalyst is a promising approach to achieve the mitigation of the greenhouse effect. In this paper, for the first time, the dielectric barrier discharge (DBD) plasma and halide perovskite photocatalysts were synergistically used to facilitate the carbon dioxide conversion. After introducing the photocatalyst into the plasma reactor, the plasma discharge characteristics were improved by the photocatalyst while the active photons, electrons, and vibrationally excited molecules in plasma also enhanced the photocatalytic activity of the photocatalyst. Compared with pure CsPbBr3 and Al2O3, the CsPbBr3@TiO2 with the best photocatalytic activity also exhibited the best performance in plasma. The carbon dioxide conversion rate of the DBD plasma filled with CsPbBr3@TiO2 was found to be 29.6% higher than the sum of sole plasma and photocatalysis, illustrating the achievement of the synergistic effect between the plasma and photocatalyst. This work brings up new opportunities for efficient large-scale conversion and utilization of carbon dioxide by the coupling of nonthermal plasma and photocatalysis.

Nonthermal plasma

Titanium Dioxide

10.1021/acs.jpclett.2c00253

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Citations (21)

Improved uniformity in resistive switching behaviors based on PMMA films with embedded carbon quantum dots

Applied Physics Letters (2021)

Liye Li Binglin Liu Julin Feng Wei Hu Hao Lin

The growth and rupture of conductive filaments act a crucial part in the reliability of resistive switching behaviors. The random growth and rupture of conductive filaments are the primary reason for the instability of set/reset reproducibility. Hence, we propose a method that embedded carbon quantum dots (CQDs) in polymethylmethacrylate (PMMA) to fabricate the Ag/PMMA&CQDs/FTO resistive switching device. Five different concentrations of CQDs are embedded in PMMA to regulate the resistive switching properties, and the resistive memory characteristics of the optimal group are systematically studied. The optimal group exhibits excellent switching repeatability, low set/reset voltages, and stable forming voltage, which is much better than PMMA without CQDs. Furthermore, we employ the COMSOL software to build a simulation model for exploring the influence of CQDs on the internal electric field of PMMA, which proved that the introduction of CQDs might have a favorable effect on the orderly growth of conductive filaments.

Resistive touchscreen

Reset (finance)

Carbon Quantum Dots

10.1063/5.0053702

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Citations (30)