ACS Omega
·
2021
·
IF 3.512
Yu Ji,Jian-Bin Zhang,Hao-Ran Shen,Zhan Su,Hao Cui,Tao Lan,Jia-Qian Wang,Yu-Hui Chen,Lihui Liu,Kun Cao,Wei Shen,Shufen Chen
The wide application of CsPbI3 nanocrystals (NCs) is limited due to their poor phase stability. We reported that Mn2+-CsPbI3 NCs have better optical performance and phase stability. With a suitable Mn/Pb ratio (5.0%), Mn2+-doped α-CsPbI3 NCs exhibited the best stability under UV irradiation, ethanol addition, and heating. Under UV irradiation and addition of ethanol, photoluminescence (PL) intensities of CsPbI3 NCs could be only preserved up to 35% (22 min UV irradiation) and 10% (ethanol addition), respectively, whereas, Mn2+-doped CsPbI3 (5.0%) exhibited much improved stability, and their intensities could be preserved up to 70% (22 min UV) and 58% (ethanol), respectively. It should be noted that crystal-phase stability could be maintained at least 7 h even at 120 °C. We believe that the improved stability in extreme conditions for α-CsPbI3 NCs can be further applied to optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 5
·2673-2683
·
IF 2.302
Huang Zhangyu,Yi Mengji,Gao Huiping,Zhang Zhenlong,Mao Yanli
A strategy is demonstrated for simultaneous size and color tuning of KZnF 3 :Yb 3+ /Er 3+ nanocrystals through transition metal Mn 2+ doping. The experimental results indicate that the introduction of Mn 2+ into the KZnF 3 :Yb 3+ /Er 3+ reaction system facilitates the decrease of the crystal size. Moreover, in the case of a high concentration of Mn 2+ doping, the downshifting (DS) and upconversion (UC) luminescence all show a single red band emission. In this work, we mainly investigate the DS and UC energy transfer process among Mn 2+ /Yb 3+ /Er 3+ in KZnF 3 nanocrystals by the detection and analysis of the absorption, excitation, emission, and transient fluorescence spectra. The results show that both Mn 2+ and Yb 3+ ions can decrease the green emission while improving the red luminescence of Er 3+ . This DS and UC single red color tuning is significant for the application of nanoparticles in light conversion, biological labeling, or plant photosynthesis.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 7
·2980-2985
·
IF 3.288
Zhen Li,Li Li,Huali Liu,Fei Li,Jiaqi Zhao,Yu Wang
Mn2+-doped CsPbBr3 nanocrystals (NCs) within MCM-41 mesophase silica have been prepared via a template-assisted strategy by using MCM-41 as the template. The template-synthesized CsPb1−xMnxBr3 NCs (x = 0–1) with the investigated perovskite compositions are luminescent with 465 nm pure blue light. The coprecipitation of bulk materials can be controlled by varying the amount of Mn2+ doping because the formation energy of CsPbBr3 NCs rises slightly on increasing the Mn2+ content and then decreases with the further increase in the Mn2+ content. Furthermore, they also exhibit excellent UV and air stability due to the existence of MCM-41 mesoporous silica and can be used as phosphors for solid-state lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 8
·2203031
·
IF 9
Zhongyuan Li,Bin Li,Wuqi Liu,Dong Yan,Qiang Tang,Zhen Fang,Rong-Jun Xie
Mn 2+ -activated halide double perovskites (HDPs) are found to show promising luminescent behavior and have great potential for optoelectronic applications. However, such interesting materials hitherto are only limited to compounds with a monotonous three-dimensional structure and show a low photoluminescence quantum yield (PLQY). Herein, an Mn 2+ -doped two-dimensional (2D) layered HDP PPA 4 NaInCl 8 (PPA + = C 6 H 5 (CH 2 ) 3 NH 3 + ) showing promising photoluminescence properties is reported. The large separation between the adjacent inorganic sheets and the good dissolution of Mn 2+ in the layered structure endow PPA 4 NaInCl 8 :Mn 2+ with efficient red emission and a record PLQY of 69.90%. The spectroscopic analyses and density functional theory calculations indicate that the inherent absorption and luminescence stem from the inserted organic cations PPA + in PPA 4 NaInCl 8 . An energy transfer process occurs between the singlet excitons from PPA + and Mn 2+ , resulting in tunable emission accompanied by the variation of Mn 2+ concentration. These results provide several new fundamental insights on doping and doped 2D layered HDPs, which enhances the understanding of structure−property relations in this important family.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Mingyin Zhu,Yu Wang,Jiake Li,Hedong Jiang,Xin Liu,Pingchun Guo,Hua Zhu,Yanxiang Wang
Photorechargeable supercapacitors were constructed using Mn 2+ - doped ZnCo 2 O 4 as the photoanode, reduced graphene oxide hydrogel (rGH) as the cathode and Zn (CF 3 SO 3 ) 2 as the electrolyte. The physical composition, microstructure, light absorption, chemical structure, and electrochemical performance of the supercapacitors were comprehensively characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HR-TEM), ultraviolet–visible (UV–Vis), X-ray photoelectron spectroscopy (XPS), and electrochemical workstation, respectively. The results show that under the photoelectric synergistic charging conditions (current density of 0.2 A g −1 and light intensity of 95 mW cm −2 ), the specific capacity of the 4 % Mn 2+ -doped ZnCo 2 O 4 //rGH supercapacitor is 256.4 F g −1 , which is 12 % higher than that of the electric charging, and 69 % higher than that of the ZnCo 2 O 4 //rGH supercapacitor. The 4 % Mn 2+ - doped ZnCo 2 O 4 //rGH supercapacitor shows Coulombic efficiency of 100 % for both electric and photoelectric synergistic charging after 10000 cycles, and the capacity retention rate of 78 % and 122 %, respectively, which are 28 % and 22 % higher than that of ZnCo 2 O 4 //rGH supercapacitor at the same conditions, suggesting that the 4 % Mn 2+ - doped ZnCo 2 O 4 //rGH supercapacitor has better photoelectrochemical performance than the ZnCo 2 O 4 //rGH supercapacitor.
✓ 已验证
产品关联
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2018
·Vol. 7
·期 12
·R215
·
IF 1.808
Quan Dong,Fengli Yang,Jun Cui,Hong Ming,Fu Du,Jiaqing Peng,Yabin Tian,Shaohua Yang,Xinyu Ye
A series of γ-AlON: Ce3+, Mn2+ phosphors were prepared via a high-temperature solid-state reaction. The phase formation and morphology, photoluminescence excitation and emission spectra, absorption spectra, lifetime, and thermal stability were investigated in detail. The γ-AlON: Ce3+, Mn2+ phosphor showed two emission bands under 285 nm excitation. The first broad band at 400 nm was attributed to Ce3+ ion emission, and the narrow band found at 517 nm was assigned to the Mn2+ ions. The critical distance of energy transfer from Ce3+ to Mn2+ has been calculated according to the concentration quenching method. The mechanism of energy transfer from Ce3+ to Mn2+ was of the resonance type and occurred via a dipole − dipole interaction. After doping Ce3+ in the γ-AlON matrix, the absorption, internal quantum, and external quantum efficiencies of γ-AlON: Ce3+, Mn2+ can be increased to 68.8%, 60.9%, and 41.9%, respectively. Furthermore, γ-AlON: Ce3+, Mn2+ exhibited superior thermal stability, with the emission intensity measured at 150°C maintaining 99% of the maximum emission intensity.
研究领域:
材料科学
·
光学
·
固体物理
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2014
·Vol. 4
·期 1
·1-8
·
IF 5.078
Cao Sheng,Li Chengming,Wang Lin,Shang Minghui,Wei Guodong,Zheng Jinju,Yang Weiyou
CuInS 2 (CIS) quantum dots (QDs) have tunable photoluminescence (PL) behaviors in the visible and near infrared spectral range with markedly lower toxicity than the cadmium-based counterparts, making them very promising applications in light emitting and solar harvesting. However, there still remain material- and fabrication- related obstacles in realizing the high-performance CIS-based QDs with well-resolved Mn 2+ d-d emission, long emission lifetimes as well as high efficiencies. Here, we demonstrate the growth of high-quality Mn 2+ -doped CuInS-ZnS (CIS-ZnS) QDs based on a multi-step hot-injection strategy. The resultant QDs exhibit a well-resolved Mn 2+ d-d emission with a high PL quantum yield (QY) up to 66% and an extremely long excited state lifetime up to ~3.78 ms, which is nearly two times longer than the longest one of “green” QDs ever reported. It is promising that the synthesized Mn 2+ -doped CIS-ZnS QDs might open new doors for their practical applications in bioimaging and opto/electronic devices.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 160
·期 16
·
IF 3.1
Du Luchao,An Jie,Katayama Tetsuro,Duan Menghan,Shi XiaoPing,Wang Yunpeng,Furube Akihiro
In recent years, all-inorganic perovskite materials have become an ideal choice for new thin film solar cells due to their excellent photophysical properties and have become a research hotspot. Studying the ultrafast dynamics of photo-generated carriers is of great significance for further improving the performance of such devices. In this work, we focus on the transient dynamic process of CsPbBr 3 /TiO 2 composite systems with different Mn 2+ doping contents using femtosecond transient absorption spectroscopy technology. We used singular value decomposition and global fitting to analyze the transient absorption spectra and obtained three components, which are classified as hot carrier cooling, charge transfer, and charge recombination processes, respectively. We found that the doping concentration of Mn 2+ has an impact on all three processes. We think that the following two factors are responsible: one is the density of defect states and the other is the bandgap width of perovskite. As the concentration of doped Mn 2+ increases, the charge transfer time constant shows a trend of initially increasing, followed by a subsequent decrease, reaching a turning point. This indicates that an appropriate amount of Mn 2+ doping can effectively improve the photoelectric performance of solar cell systems. We proposed a possible charge transfer mechanism model and further elucidated the microscopic mechanism of the effect of Mn 2+ doping on the interface charge transfer process of the CsPbBr 3 /TiO 2 solar cell system.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 34
·8844-8851
·
IF 4.696
Sheng Cao,Jialong Zhao,Weiyou Yang,Chengming Li,Jinju Zheng
In the present work, we reported the synthesis of Mn2+-doped Zn–In–S quantum dots (QDs) with high optical performance in a controlled manner. The effects of the temperature, the introduced ODE-S amount and Zn/In ratios in the raw materials, as well as the Mn2+ doping concentrations on the photoluminescence (PL) properties of Mn2+-doped Zn–In–S QDs were investigated systematically. The resultant QDs exhibit tunable bandgaps ranging from 2.9 to 3.7 eV, well-resolved Mn2+ d–d emission with a PL quantum yield (QY) of 56% and a surprisingly long excited state lifetime up to ∼4.2 ms, suggesting their excellent PL properties. Meanwhile, the initial high PL QY of the obtained Mn2+-doped Zn–In–S QDs in organic solvents could be preserved very well once they were transferred into aqueous media via ligand exchange. Furthermore, the as-synthesized QDs exhibit excellent thermal stability up to 200 °C in a crude solution.
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 Physical Chemistry C
·
2022
·
IF 4.177
Jingna Jia,Li Fu,Xuwen Gao,Shuangtian Dong,Yuqi Xu,Dongyang Wang,Guizheng Zou
Mechanoluminescence (ML) is one kind of mechanical-to-optical energy conversion, and a strategy toward achieving bright elastic ML emission is strongly anticipated for ML application. Herein, a ternary-host strategy is proposed for synthesizing heterojunction ML materials with eye-visible elastic ML under an ultralow pressure of 2 N, in which ZnS, CaCO3, and SrCO3 are employed as precursors to prepare the ternary-host (Ca0.5Sr0.5)ZnOS/xZnS. Upon partially substituting the precursor ZnS with MnCO3, the Mn2+ activator could introduce luminescent centers and carrier traps into the ternary-host (Ca0.5Sr0.5)ZnOS/xZnS and enable achieving a series of (Ca0.5Sr0.5)ZnOS/xZnS/Mn2+ phosphors with bright and pressure-sensitive elastic ML. The (Ca0.5Sr0.5)ZnOS/xZnS/Mn2+ phosphors not only exhibit eye-visible red ML under ambient conditions without any preirradiation but can also display a linearly enhanced ML intensity along with the enlarged external force at a 2 N interval as well as regeneratable ML upon repetitively applying an external force 20 times. The maximum emission wavelength of ML can be conveniently modulated from 623 to 658 nm by adjusting the ZnS content of (Ca0.5Sr0.5)ZnOS/xZnS/Mn2+ phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xinyue Gu,Chen Tan,Lixian He,Jie Guo,Xia Zhao,Kezhen Qi,Ya Yan
In this work, AgInS 2 and Mn 2+ doped AgInS 2 (Mn–AgInS 2 ) with different Mn 2+ : (Ag + + In 3+ ) ratios were synthesized via a low temperature liquid method. The photocatalytic activity of the obtained samples was followed by taking formaldehyde as the target pollutant under visible light irradiation. The photocatalysts were passed through various characterization procedures to investigate their morphological, structural and photophysical characteristics. The optimal proportion sample [with the ratio n (Mn 2+ ): n (Ag + + In 3+ ) = 1:100] photodegraded about 79% formaldehyde in 150 min. These upgraded activities are attributed to the enhanced visible light absorption and superior charge separation due to the presence of Mn 2+ as confirmed site from charge separation measurements. In addition, a possible mechanism for the photodegradation of formaldehyde is proposed based on the experimental results. Furthermore, the photocatalytic water splitting performance of Mn–AgInS 2 and multi-walled carbon nanotubes (MWCNTs) modified Mn–AgInS 2 is investigated and compared under simulated sunlight irradiation, and remarkable hydrogen production is achieved (105 μmol h −1 g −1 ) by using the latter.
研究领域:
材料科学
·
环境科学
·
光催化领域
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5113-5123
·
IF 6.569
Runtian Kang,Hang Chen,Ruijie Ji,Haoyang Wang,Takatoshi Seto,Yuhua Wang
It is of great significance for white light-emitting diodes (wLEDs) to explore new, efficient and stable inorganic phosphors excited by wideband near-ultraviolet (n-UV) light. A new type of efficient emission-tunable Ce3+/Mn2+ doped Ca2YHf2Al3O12 (CYHAO) garnet phosphor which can be excited by n-UV light is studied in this work. Due to the effective energy transfer (ET) from Ce3+ to Mn2+ in CYHAO, CYHAO:0.09Ce3+,xMn2+ phosphors have a wide excitation band in the 370–470 nm region with a peak at 410 nm. Under excitation at 410 nm, all the samples show tunable color emission and match with the near UV chip. Through the decay time, it is determined that the energy transfer efficiency is as high as 88.83%. The calculated activation energy is about 0.217 eV, indicating the relatively good thermal stability. The cathodoluminescence (CL) properties show that the phosphor has a high saturation current and saturation voltage. A single component white LED is fabricated by using the CYHAO:0.09Ce3+,0.3Mn2+ phosphor and a 400 nm n-UV chip. It is worth noting that the detailed study of the energy transfer mechanism, thermal quenching mechanism and CL mechanism has reference value for the development of new co-doped phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
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