ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xueping Yu,Zhongzhe Liu,Xiya Yang,Yudi Wang,Jihua Zhang,Jialong Duan,Liming Liu,Qunwei Tang
Triboelectric generators (TENGs) have been extensively studied as a new energy for low cost and the universally applicable prospect. Meanwhile, perovskites have been applied in TENG and show a good performance in view of high carrier mobility, long life and dielectric properties. The asymmetry structure of the orthogonal phase CsPbBr3 perovskite endows it with ferroelectric property and induces the misalignment of the positive and negative charge centers. Herein, the surface energy of halogen doped inorganic CsPbX3 (X = Cl–, Br–) perovskites are theoretically investigated by density functional theory (DFT) calculation, the crystal polarizability of pristine CsPbBr3 is improved from 0.47 Ry a.u. to 0.52 Ry a.u. (CsPbCl3), indicating the polarizability of CsPbCl3 is higher than CsPbBr3. In addition, the build-in electric field (Ebuild-in) of perovskite materials can be enhanced by the spontaneous polarization and the aligned dipoles in the Ebuild-in could further improve the tribo-electrostatic electric field by retaining more triboelectric surface charges. In the end, CsPbCl3 achieved a power of 3.06 W m–2 compared to the power of 1.34 W m–2 of CsPbBr3. This work focuses on the regulation of crystal planes using spontaneous polarization of perovskite toward achieving a high built-in electric field for enhancing triboelectric surface charge density.
研究领域:
材料科学
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能源技术
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Jianing Cheng,Yanan Li,Wei Qu,Min Sun,Yiwen Liu,Wangzhou Shi,Weijie Du,Yiwen Zhang
Mn-doped CsPbCl 3 nanocrystals are considered to be a promising material for luminescence and display applications owing to Mn doping provides a way to introduce new optical properties and reduce the use of toxic Pb. Complicate ion-exchange and hot-injection are commonly used for the fabrication of the nanocrystals. Developing a fast and efficient synthesis method remains a challenge so far. Herein, we developed a simplified solid-state mechanochemical approach to synthesize Mn-doped CsPbCl 3 nanocrystals and investigated the structure and luminescence properties of the as-synthesized nanocrystals. Cubic morphology of Mn-doped CsPbCl 3 nanocrystals with average size of 13 nm have been obtained by this approach. Mn was successfully incorporated in CsPbCl 3 perovskite nanocrystals , resulting in a high photoluminescence quantum yield of 40.7% with an improvement of stability. Emission peak of 594 nm that can be assigned to the luminescence of Mn 2+ d-d transition was observed under 365 nm UV excitation. The color of the luminescence changed from blue to warm white to yellow depended on the amount of Mn doping, exhibiting a tunable-color property. It is expected that this approach provides an effective route that would help for synthesis of perovskite nanocrystals doped with different dopants .
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Sihang Ji,Xi Yuan,Ji Li,Jie Hua,Yunjun Wang,Ruosheng Zeng,Haibo Li,Jialong Zhao
The Mn2+-doped CsPbCl3 nanocrystals (NCs) with a low Mn2+ doping concentration were synthesized using different reaction temperatures to control the NC size from 5.3 to 17.4 nm and then were studied by means of steady-state and time-resolved photoluminescence (PL) spectroscopy at various temperatures. The Mn2+ emissions with different quantum yields in the doped NCs in hexane exhibited nearly size-independent and single-exponential decay lifetimes of 1.8 ms at room temperature. The PL lifetimes in all Mn2+ in CsPbCl3-doped NCs had similar temperature dependence from 80 to 300 K, whereas they were size-dependent at elevated temperatures, reflecting thermal degradation of doped NCs. The degradation mechanisms of Mn2+ PL were attributed to the amount of surface defects as nonradiative recombination centers generated in size-unchanged and grown Mn2+:CsPbCl3 NCs. The study provides the detailed understanding of the thermal degradation mechanisms in doped perovskite NCs for optoelectronic applications.
研究领域:
纳米材料
·
光电子学
·
光物理
·
钙钛矿纳米晶
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Jian Yang,Xi Yuan,Lin Fan,Yuzhu Zheng,Fanshu Ma,Haibo Li,Jialong Zhao,Huilian Liu
Mn doped cesium lead halide perovskite nanocrystals (NCs) have potential application for white light emitting diodes. However, the emission of doped NCs is limited to trap-mediated energy transfer. The Mn doped CsPbCl 3 NCs with corporation of rubidium (Rb + ) ions (Mn:Cs 1-x Rb x PbCl 3 NCs, x = 0, 0.1, 0.2, 0.3, and 0.4) were synthesized. The effect of the optical and structural properties of Mn:Cs 1-x Rb x PbCl 3 NCs were studied by steady-state and time-resolved photoluminescence spectroscopy. The photoluminescence quantum yields and lifetimes of Mn doped CsPbCl 3 NCs with different Rb + contents were obtained. It was found that the Mn doped CsPbCl 3 NCs with Rb + content of 0.1 exhibited the highest Mn 2+ emission quantum yield up to 63.18%. Interestingly, the temperature-dependent PL spectra demonstrated the enhanced Mn 2+ emission of Mn doped CsPbCl 3 NCs at low temperature of 80 K. The experimental result indicated the Mn 2+ emission of Mn doped CsPbCl 3 NCs was enhanced by incorporating Rb + ions.
研究领域:
材料科学
·
光电子学
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纳米技术
·
光物理
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2026
·
IF 5.2
Xiaodong Zhang,Lianrong Zhang,Kaiming Chen,Yitao Wang,Lilong Zhang,Linlin Zhang
Lanthanide-doped perovskite nanocrystals (NCs) have emerged as attractive emitters operating at telecommunication wavelengths. Nevertheless, achieving efficient lanthanide incorporation generally demands high synthesis temperatures (>240 °C), which complicates control over NC size and uniformity. In this work, we revealed that by replacing excess Pb 2+ with lanthanide halides, Ostwald ripening was effectively suppressed, resulting in precise size tuning and enhanced doping. This versatile lanthanide halide–mediated strategy yields highly monodisperse Yb/Er-codoped CsPbCl 3 NCs that exhibit a record photoluminescence quantum yield (21.2%) at 1.54 μm among colloidal perovskite systems. A light-emitting diode (PeLED) was fabricated, showing nearly pure 1.54 μm emission, achieving the peak external quantum efficiency (EQE) of 0.464% under low driving voltage of 2.7 V. In conclusion, the development of 1.54-μm Er-PeLEDs presents new prospects for integrated light sources.
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Yanbo Xing,Xi Yuan,Sihang Ji,Michio Ikezawa,Ruosheng Zeng,Haibo Li,Yasuaki Masumoto,Jialong Zhao
Highly luminescent Mn doped perovskite nanocrystals (NCs) are promising in solid state lighting. The thermal stability of Mn 2+ luminescence in Mn: CsPbCl 3 NC/mesoporous silica (MPS) composites was studied at temperature ranging from 80 K to 450 K by steady-state and time-resolved photoluminescence (PL) spectroscopy. The Mn: CsPbCl 3 NCs with various Mn doping concentrations were synthesized by changing the Mn/Pb molar ratios at 190 °C. It was found that the Mn doped NC films showed a more significant decrease in PL intensities and lifetimes at high temperature above 320 K than the Mn doped NC/MPS films, indicating that the Mn 2+ luminescence in doped NC/MPS films exhibited better thermal stability than that of NC films. Further the broadening and shifts of Mn 2+ emission bands in doped NC and NC/MPS films were observed at elevated temperature. The temperature-dependent linewidths of Mn 2+ emission bands were discussed by electron-phonon coupling.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Duo Zhang,Mengmeng Yu,Yaobin Xu,Danyang Li,Yang Huang,Chao Yu,Chengchun Tang,Jing Lin
The controllable synthesis of two-dimensional all-inorganic lead halide perovskite (CsPbX 3 , X = Cl, Br and I) nanoplates (NPLs) has attracted wide attention of researchers. However, the direct synthesis of high-quality CsPbCl 3 NPLs with controllable morphology still faces a challenge. Herein we report a solvothermal method to directly synthesize CsPbCl 3 NPLs. By varying solvothermal reaction time, the thickness of the NPLs has be successfully adjusted from 2.8 to 3.6 nm, and the red shift of the photoluminescence (PL) emission from 391 to 402 nm has been realized. Subsequently, effective post-treatment on the as-prepared CsPbCl 3 NPLs using CoCl 2 results in the greatly enhancement of PL quantum yield (PLQY) from original 14.09 to final 50.4%, showing the best PLQY among all CsPbCl 3 NPLs samples to date. This work not only provides a reliable process for the controllable preparation of CsPbCl 3 NPLs, but also supplies more selectivity for the post-treatment of CsPbCl 3 nanocrystals using chloride compounds.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 33
·8990-8998
·
IF 5.976
Daqin Chen,Gaoliang Fang,Xiao Chen,Lei Lei,Jiasong Zhong,Qinan Mao,Su Zhou,Junni Li
All inorganic CsPbX3 (X = Cl, Br, I) perovskite quantum dots have attracted extreme attention due to their excellent optical performance. Unfortunately, heavy usage of the toxic Pb element is still a serious problem that needs to be solved. In the present work, Mn-doped CsPbCl3 nanocrystals are successfully prepared via a facile solvothermal reaction for the first time. A high Cs-to-Pb feeding ratio is necessary to achieve pure cubic perovskite phase and the incorporation of Mn dopants into the CsPbCl3 host is highly related to the Mn-to-Pb feeding ratio. Importantly, it is demonstrated that Mn-doped CsPbCl3 NCs synthesized by the solvothermal method have better stability than those prepared by traditional hot injection. To finely adjust the bandgap of CsPbCl3 NCs, Cl-to-Br anion exchange is used to fabricate Mn-doped CsPb(Cl/Br)3 NCs with tunable multi-color luminescence. Finally, the as-prepared Mn-doped CsPb(Cl/Br)3 products are demonstrated to be applicable as color converters for constructing white light-emitting diodes and optical thermometric medium for accurate temperature sensing.
研究领域:
材料科学
·
纳米技术
·
光电子学
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发光材料
·
固态化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Xinli Wu,Weichao Qi,Hong Zhu,Yuhui Dong,Aocheng Jiang,Huanyang Chen,Hongtan Huang,Lu Han,Yousheng Zou
CsPbX 3 (X = Cl, Br, I) perovskites have been recognized as ideal candidates for light-emitting device applications due to their excellent optoelectronic properties, but the toxicity of lead has raised significant environmental concerns. Mn doping in lead-based perovskite nanocrystals (NCs) has been conducted to mitigate lead toxicity risks while enhancing photoluminescent performance. While high Mn concentrations can increase Mn–Mn defect states, complicating the balance between high photoluminescence quantum yield (PLQY) and low lead. In this study, a PLQY of 85.8% was achieved by precisely controlling the Mn/Pb feed ratio at a concentration of 11.37%. The enhancement in PLQY is attributed to reduced Cl vacancies, which lower defect states and non-radiative recombination rates. Stability was also improved through doping, and white light emitting diode (WLED) utilizing these materials exhibited color coordinates (0.3379, 0.3479) that closely approximate standard white light emission. This work provides a solution for achieving high-quality Mn 2+ doped perovskite NCs, and highlights its potential in solid-state lighting solutions while addressing lead toxicity concerns.
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2026
·
IF 4.3
Guiyuan Liu,Wannan Dai,Ziyue Wang,Xiaotian Lu,Ying Ma
Metal halide perovskite (MHP) nanocrystals (NCs) exhibit outstanding optoelectronic properties, making them promising candidates for light-emitting diodes (LEDs). However, their practical application is severely hindered by poor environmental stability. Specifically, violet-emitting CsPbCl 3 NCs suffer from low luminescence properties because of deep-level trap-mediated non-radiative recombination. Here, we report a core-shell structure in which a CsPbCl 3 NC is epitaxially coated with a Cs 2 NaInCl 6 double perovskite shell via a hot-injection method. The resulting CsPbCl 3 @Cs 2 NaInCl 6 heterostructures feature type-I band alignment, enabling effective surface defect passivation and strong charge carrier confinement within the CsPbCl 3 core. As a result, the photoluminescence quantum yield (PLQY) of CsPbCl 3 NCs increases dramatically from 4.4% to 49.5%, accompanied by a prolonged photoluminescence lifetime and a narrower emission spectral full width at half maximum (FWHM). Beyond luminescence enhancement, the Cs 2 NaInCl 6 shell imparts remarkable resistance against damage from water, UV irradiation, and heat. Furthermore, the same encapsulation strategy significantly improves the stability of Mn and Ni-doped CsPbCl 3 (CsPbCl 3 :Mn and CsPbCl 3 :Ni) NCs. This work provides an effective strategy to simultaneously enhance luminescence performance and environmental stability of CsPbCl 3 NCs through passivation with a double perovskite shell.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 132
·期 3
·
IF 2.877
Guo Heng,Zhu Yizhi,Chen Jinping,Xie Xiaoyu,Jiang Qingsong,Xu Chunxiang,Cui Qiannan,Shi Zengliang
As an effective means to endow lead halide perovskite nanocrystals (NCs) with new properties, ion doping has been widely applied. Transition metal Mn-doped CsPbCl 3 is of particular interest, as the Mn doping introduces new emission bands, improves photoluminescence quantum yield (PLQY), and even enhances stability. However, it is still insufficient to catch insight of the energy transfer process and luminescence characteristics of these high defect tolerance NCs doped with Mn ion. Here, we systematically studied the energy transfer from exciton to Mn 2+ ions in Mn-doped CsPbCl 3 NCs by variable temperature steady-state fluorescence spectra and time-resolved spectra. The abnormal attenuation behavior of the exciton and Mn 2+ with the change of temperature was observed, from which we predict the existence of shallow traps near the conduction band and these shallow traps will affect the luminescence properties by influencing the energy transfer process. We show a simple physical model invoking only shallow trap states that uniquely describe the temperature-dependent energy transfer between the exciton and the Mn 2+ ion. The thermometric performance (30–290 K) was studied in terms of relative thermal sensitivity, in which the calculated relative sensitivity range is ∼0.12%–1% K −1 .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Fan Xu,Haoming Wei,Yangqing Wu,Yu Zhou,Jinkai Li,Bingqiang Cao
The CsPbCl 3 perovskite films are successfully grown on quartz substrates by radio frequency (RF)-magnetron sputtering method and their detailed photoluminescence properties are studied over the temperatures from 10 K to 300 K. There exists one near bandgap emission peak (∼410 nm) in the violet region with typical lifetime of few nanoseconds at room temperature . To our surprise, with temperature increasing, this band shows nonmonotonic shift, which is different to the traditional semiconductor like silicon or the same group of perovskites like MAPbI 3 or CsPbBr 3 . The origin of this band and its temperature-dependent shift can be well described with the Bose-Einstein two-oscillator model that takes into account the interaction between electrons and phonons including acoustic phonons and optical phonons. Due to the anisotropic optical properties of the perovskite crystal, the (001)-orientated films have stronger electron phonon coupling and weaker exciton binding energy.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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