JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xinhong Zhao,Kai Li,Yongchu Fang,Yu Tao,Xiaoxian Song,Haiting Zhang,Huaqing Yu,Zaoxue Yan
Flexible photodetectors based on vertically stacked PEDOT:PSS/PbS/CsPbCl 3 were prepared by a simple low temperature spin-coating method. Due to the synergistic effect, the flexible PEDOT:PSS/PbS/CsPbCl 3 photodetectors exhibited a high responsivity of 6.67 A/W and detectivity of 5.78 × 10 10 Jones under a relatively low external bias. The photocurrent of a series of continuous-bending shown that the flexible PEDOT:PSS/PbS/CsPbCl 3 photodetectors had excellet photocurrent stability and reproducibility. The results indicate that the vertically stacked PEDOT:PSS/PbS/CsPbCl 3 architecture has great potential in wearable and portable low-voltage optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zelong Zhang,Linli Shen,Yi Zhao,Yujie Zhang,Haisheng Yang,Weidong Xiang,Xiaojuan Liang,Guoxin Chen,Haitao Yu
Many previous studies have reported that because of the large difference between the ionic radii of Cl and I, halogen exchange is difficult to occur between CsPbCl 3 and CsPbI 3 perovskite nanocrystals, and the interaction between CsPbCl 3 and CsPbI 3 NCs will lead to their dissolution. In this work, two kinds of nanocrystals, CsPbCl 3 and CsPbI 3 , were successfully crystallized simultaneously in glass by an in-situ growth method for the first time. Because of the effective reabsorption of photons, the CsPbCl 3 :CsPbI 3 nanocrystals displayed higher fluorescence emission intensity and higher photoluminescence quantum yield than those of CsPbI 3 nanocrystals. In addition, CsPbCl 3 :CsPbI 3 nanocrystal glasses showed excellent water resistance and thermal stability, which benefited from the effective protection of the glass matrix. In particular, the fluorescence intensity of the nanocomposites remained above 95% after immersion in water for 60 days. Light-emitting devices were prepared by combining a near-infrared-emitting CsPbCl 3 :CsPbI 3 nanocrystal glass and 400 nm LED chip, which were applied to indoor plant growth.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xianju Zhou,Shouchun Zhao,Jie Zhang,Guotao Xiang,Sha Jiang,Li Li,Yongjie Wang,Yanhong Li,Chuan Jing,Lu Yao,Hongmei Yang,Zhen Wang
As a new generation of luminous material , perovskite quantum dots (PQDs) possess many excellent properties. However, PQDs suffer from dramatic decrease of optical performance when affected by high temperature. In this paper, methamidine acetate (FA + ) and manganese divalent cation (Mn 2+ ) codoped CsPbCl 3 quantum dots (QDs) were synthesized. The introduced FA + and Mn 2+ were designed to substitute Cs + (A sites) and Pb 2+ (B sites), respectively. By comparison with CsPbCl 3 :Mn 2+ QDs, the results show that the CsPbCl 3 :FA + ,Mn 2+ QDs improve the blue exciton luminescence by 15% and the red Mn 2+ ions luminescence by 37%. Furthermore, CsPbCl 3 :FA + ,Mn 2+ QDs demonstrate super thermal stability by maintaining 97% of Mn 2+ emission when the temperature is raised to 70 °C even after 6 thermal cycles. Simultaneously, the UV light and water stability of CsPbCl 3 :FA + ,Mn 2+ QDs have also been obviously enhanced. The powder of the coped PQDs have been fabricated into a white LED which exhibits Color Rendering Index (CRI) of 88.2 and Correlated Color Temperature (CCT) of 5745 K. It shows that CsPbCl 3 :FA + ,Mn 2+ QDs not only reduce the Pb 2+ ions toxicity problem but also boost the thermal stability and thermal cyclability, which may open up more possibilities for the applications in optoelectronic devices.
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 NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 11
·7561-7565
·
IF 1.354
Wang Kang,You Fangtian,Peng Hongshang,Huang Shihua
All-inorganic cesium lead halide perovskites have attracted a lot of attention as the promising optoelectronic materials because of their excellent and controllable optical and electric properties. The photoluminescence (PL) properties of undoped and Ce3+ doped CsPbCl3
quantum dots (QDs) at different temperatures were studied. The peak wavelength, the intensity of the PL spectra and the full width of half maximum of host QDs emissions present monotonous changes corresponding to the variation of temperature in the range from 22 to 62 °C. Doping with Ce3+
leads to another photoluminescence peak arising from Ce3+ emission. The introduction of Ce3+ ions changed the host QDs emission properties and temperature-dependent characteristics. With the temperature increasing, the emission of host QDs decreased sharply while the
emission of Ce3+ decreased slowly. The florescence intensity ratio between the emission intensities of CsPbCl3 QDs and Ce3+ were calculated to obtain the maximal values of absolute and relative sensitivities of CsPbCl3:Ce3+ QDs. The results
show the potential use of the CsPbCl3 QDs doped with Ce3+ for luminescent thermometers.
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
·
2019
·
IF 2.687
Changhong Li,Ye Li,Tianliang Zhou,Rong-Jun Xie
Mn-doped CsPbCl 3 (CsPbCl 3 :Mn) perovskite colloidal quantum dots (QDs) attract a great deal of interests, and have great potentials for various optoelectronics applications due to their outstanding optical and electrical properties. However, practical applications of CsPbCl 3 :Mn QDs are severely limited by the cumbersome preparation methods and low photoluminescence quantum efficiency (PLQY). Herein, we propose a single-step ultrasonic synthesis method to successfully synthesize CsPbCl 3 :Mn QDs with controlled size and morphology by changing the Mn:Pb ratio. Simultaneously, we introduce triethylamine (TETN) to passivate the surface of CsPbCl 3 :Mn QDs. The phase purity, microstructure, chemical composition and photoluminescence properties of the samples were investigated by means of various analytic techniques. The synthesized QDs exhibit dual emissions of 411 and 601 nm, ascribing to the excitonic emission of QDs and the characteristic Mn 2+ emission, respectively. The quantum yield of the CsPbCl 3 :Mn QDs could therefore be significantly improved from 17.49 to 41.15%. We believe that the facial synthesis method and the surface passivation of TETN can also be applied to other transition metal or lanthanide ions doped lead halide perovskite QDs.
研究领域:
材料科学
·
光学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yuefeng Gao,Sai Xu,Yanbiao Li,Baojiu Chen
The low photoluminescence quantum yield (PLQY) of CsPbCl 3 perovskite quantum dots (PQDs) poses a significant challenge to their application as ion detection probes. To address this issue, we enhanced the PLQY of CsPbCl 3 PQDs through Mn doping. These enhanced PQDs were then employed as probes for the highly sensitive detection of Cu 2+ ions and temperature. CsPbCl 3 :Mn PQDs with varying Mn/Pb ratios were synthesized via hot injection. The Mn doping introduced an emission band near 600 nm, with intensity increasing alongside doping concentration. At an Mn/Pb ratio of 2.0, the PLQY was enhanced nearly tenfold, from 5.46 % for undoped CsPbCl 3 to 52.48 % for CsPbCl 3 :Mn. CsPbCl 3 :Mn PQDs with the highest PLQY were employed as luminescent probes, utilizing the fluorescence intensity ratio (FIR) technique for copper detection and temperature sensing. The experimental results demonstrated a linear relationship between the FIR and Cu 2+ concentration over the range of 22.12 nM–1600 nM, with 22.12 nM being the calculated limit of detection. Analysis of the emission spectra and fluorescence lifetimes at varying Cu 2+ concentrations revealed that electron transfer from CsPbCl 3 to Cu 2+ induced fluorescence quenching. CsPbCl 3 :Mn exhibits a high relative sensitivity of 15.89 % K −1 at 298 K, along with excellent reversibility. These findings highlight the potential application of CsPbCl 3 :Mn PQDs in both temperature sensing and the analysis of wear metals in engine lubricating oils.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Zhen Cao,Ji Li,Li Wang,Ke Xing,Xi Yuan,Jialong Zhao,Xin Gao,Haibo Li
In this work, the effects of Co 2+ ions on the structural and luminescent properties of intrinsic and Mn doped CsPbCl 3 NCs were studied by using photoluminescence (PL) spectroscopy, X-ray diffraction (XRD) spectroscopy, and transmission electron microscopy (TEM). The undoped and Mn doped CsPbCl 3 NCs with various Co/Pb molar ratios were synthesized at 190 °C. It was found that the quantum yields of purple emissions in these CsPbCl 3 NCs were greatly enhanced up to 30% after Co 2+ ions were doped. The diffraction peaks in XRD patterns shifted to a large angle with the increase of Co/Pb molar ratio, indicating Co doping in Pb-site. Further both intrinsic and Mn doped CsPbCl 3 NCs exhibited uniform cubes with average sizes of 8–10 nm and good crystallinity after Co doping. The enhancement of purple emissions from excitons in the CsPbCl 3 NCs was related to the reduction of nonradiative defects in these NCs through Co 2+ doping.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 4
·793-803
·
IF 3.117
Zhuo Chen,Lvming Dong,Cheng Zhou,Binze Zhou,Zhi Zheng,Rong Chen,Jianfeng Zang
Two-dimensional all-inorganic halide perovskites (CsPbX3, X = Cl, Br or I) have emerged as prominent materials due to their unique properties, including ultrathin thickness in high surface area for catalysis, good mechanical flexibility for flexible electronics/optoelectronics, and high charge extraction and transport for photodetectors. However, the high luminescence of two-dimensional Mn-doped CsPbX3 that is crucial to light-emitting diodes and display applications remains unfulfilled. The existing synthesis approaches of two-dimensional Mn-doped CsPbX3 usually result in low luminescence because of either low solubility of precursors at low temperature or high concentrated nanocubes at high temperature (e.g. 180 °C). Herein, we report a moderate-temperature and atmospheric approach to synthesize highly luminescent Mn-doped CsPbCl3 nanoplatelets with only 4 monolayers. Different Mn–Pb feed ratios are explored to study the morphology evolution from nanocubes to nanoplatelets and the corresponding influence of two emission peaks at around 400 nm and 600 nm. The photoluminescence quantum yield (PLQY) of our Mn-doped CsPbCl3 nanoplatelets is up to 53.76%, which is the highest reported value in Mn-doped two-dimensional all-inorganic halide perovskites. The nanoplatelets exhibit excellent stability at room temperature in air (over 60 days). For the first time, both orange-red and warm white light-emitting diodes (LEDs) have been achieved through the nanoplatelets as the color conversion materials. Moreover, flexible composite fluorescent polymer films based on the nanoplatelets are demonstrated with high luminescence and stability (over 6 months), which indicate prominent potential in flexible displays.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 22
·期 2
·178-183
·
IF 3.382
Xiaozhen Hu,Xueyang Wang,Shendong Zhuang,Jianqiang Xu
A facile solution strategy to synthesize large-sized CsPbCl3 crystals was reported and uniform micrometer-sized crystals were successfully synthesized in several minutes. Interestingly, the crystals were found to exhibit polarization sensitive properties, with a polarization anisotropic ratio of 3, which was higher than that of aligned perovskite nanowire arrays (2.6).
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 36
·11177-11183
·
IF 6.641
Jienan Xia,Song Lu,Lei Lei,Youjie Hua,Shiqing Xu
Cation doping strategy has been extensively employed to enhance the charge carrier mobility and improve the stability of halide perovskites; however, the fundamental understanding of the inherent doping mechanism is still a challenge. Herein, based on a unique four-precursor synthetic strategy and density functional theory (DFT) calculation results, we verify that excessive chloride ion concentration benefits the formation of the bond [Pb⋯Cl] vacancy pair as well as the subsequent incorporation of the [Mn⋯Cl] ion pair synchronously. As a result, high Cl− ion concentration greatly promotes the incorporation of the Mn2+ ions into the CsPbCl3 crystal lattice. The particle size reduction of the CsPbCl3 perovskite with the incorporation of the Mn2+ ions is attributed to the increased surface electron charge density, which inhibits the diffusion of the negatively charged Cl− ions to the nuclei surface. These deep insights into the inherent Mn2+ doping mechanism could guide the realization of novel ion-doped perovskites with new optoelectronic performances.
研究领域:
材料科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Jiamin Xiong,Sheng Cao,Ke Xing,Mingyan Chen,Ruosheng Zeng,Bingsuo Zou,Jialong Zhao
All-inorganic perovskite nanocrystals (NCs) are emerged as promising materials for illumination and display applications due to their excellent luminescent properties. However, the low photoluminescence quantum yield (PLQY) of violet/blue emission and poor stability of NCs restrict their development. Herein, we report an effective strategy for enhanced PLQY and stability of CsPb(Cl/Br) 3 NCs by incorporating Nd 3+ ions. It was found that Nd 3+ ions could be doped into the host perovskite NC lattice which exists in NCs as Nd 3+ . The steady-state and time-resolved PL spectra showed the decrease of the defect state density in doped NCs with the increase of Nd content. The maximum PLQY of the as-prepared Nd 3+ doped CsPbCl 3 NCs was increased up to 58% at the Nd/Pb molar ratio of 3/1. Compared with undoped NCs, the water stability of Nd 3+ doped CsPbCl 3 NCs was significantly improved. The prepared Nd 3+ doped CsPbCl 3 NCs were further post-treated by anion exchange reaction with PbBr 2 at room temperature . The PL of the as-synthesized Nd 3+ doped CsPb(Cl/Br) 3 NCs covered the emission range of 408–503 nm, and the maximum PLQY could reached 93%. This work discourses that Nd 3+ ions can improve the PLQY and stability of blue and violet perovskite NCs, which will promote their practical application.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 12
·期 4
·1430-1439
·
IF 6.4
He Yuan,Shilin Jin,Song Zheng,Rong Xie,Tao Pang,Bin Zhuang,Feng Huang,Daqin Chen
In the last five years, significant progress has been achieved in incorporating trivalent lanthanide (Ln3+) ions into CsPbX3 halide perovskite nanocrystals (PeNCs), combining superior optoelectronic performance of semiconductors with abundant Ln3+: 4f–4f transitions. However, doping divalent europium (Eu2+) with parity-allowed 5d–4f transition inside CsPbX3 remains unexplored. Herein, we develop a new class of dual-emitters based on Eu2+-doped CsPbCl3 PeNCs. Narrowband violet emission and broadband orange emission assigned to the respective exciton recombination and Eu2+: 5d → 4f transition are concurrently observed. Steady/transient-state photoluminescence (PL) spectra, time-resolved PL (TRPL) spectra and femtosecond transient absorption (fs-TA) spectra evidence independent dual-emissions without exciton-to-Eu2+ energy transfer, which is attributed to the preferred location of Eu2+ on the surface of CsPbCl3. As a consequence, exciton-longitudinal optical phonon interplay and surface ligand–Eu2+ coupling in the as-prepared Eu:CsPbCl3 PeNCs are verified based on temperature-sensitive spectroscopic analyses, together with first-principles density functional theory (DFT) calculations and crystal-field calculations. These findings provide fundamental insights into the design of novel lanthanide-doped halide perovskite emitters for versatile optoelectronic applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
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