JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yi Zhang,Cuiping Zhou,Qifeng Zhang,Pengfei Yin,Xiyuan Sun,Kaiming Wang,Jian Wang,Xing Feng
In this paper, a synthesized material change from perovskite-layer-structured La 2 Ti 2 O 7 to perovskite type LaTiO 3 induced by Li 2 CO 3 addition was observed. The [TiO 6 ] octahedral site symmetry and particle uniformity showed an obvious variation with the change from La 2 Ti 2 O 7 to LaTiO 3 . A broadband far-red emission from 670 to 780 nm emerged when Mn 4+ , Li + ions were co-doped. Furthermore, (Mn 4+ , Li + ) co-doped LaTiO 3 phosphor can be effectively excited by near-UV and blue lights, which is suitable for combining with commercial InGaN LED chips. The LaTiO 3 :0.4%Mn 4+ , 150%Li + phosphor exhibited a high quantum efficiency of 71.1% and a good thermal stability with emission intensity retained 65% at 423 K. Finally, a LED device was fabricated with the LaTiO 3 :0.4%Mn 4+ , 150%Li + phosphor, which matches well with the absorption of photochrome of P FR and shows a good potential for use in agricultural cultivation fields.
研究领域:
材料科学
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农业科学
✓ 已验证
产品关联
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 12
·126001
·
IF 2.142
Dongxin Shi,Xiaoling Xie,Haiqi Pu,Xi Zhang,Qiang Zhou,Zhengliang Wang,Yanqing Ye,Minghong Chen
A novel red-emitting Rb2KGaF6:Mn4+ phosphor with octahedral particulate morphology was presented. The XRD Rietveld refinement results indicate that the phosphor crystallized into the cubic phase of Fm\overline{3}m space group with double perovskite structure. The photo-luminescence spectrum exhibits intense red emission lines with zero-phonon line (ZPL) and v6 peak locating at 620 and 628 nm respectively. The optical parameters of low color temperature (Tc = 3824 K) and high color rendering index (Ra = 90.2 ) from white LED imply its potential application in 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
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Qiying Huang,Weihao Ye,Guangqi Hu,Xiaotang Liu
Bi 3+ and Mn 4+ co-activated Mg 3.5 Ge 1.25 O 6 phosphors were synthesized via a solid-state method in air. Codoping Bi 3+ into the matrix leads to effective enhancement of the deep-red emssion (659 nm) compared to Bi 3+ -free samples. The spectroscopic properties are discussed based on the Bi 3+ (6s 2 )→Ge 4+ (3d 10 ) metal-to-metal charge transfer and energy transfer between Bi 3+ and Mn 4+ . All samples emit deep-red emission ascribed to 2 E g → 4 A 2g transition of Mn 4+ . We have carried out the X-ray power diffraction (XRD), photoluminescence spectrum (PL), field emission scanning electron microscope (FESEM), fourier transform infrared spectroscopy (FT-IR) and UV–Vis absorption measurement to investigate the influences induced by Bi 3+ incorporation.
研究领域:
材料科学
·
光学农业
✓ 已验证
DOI
高影响因子
Frontiers of Optoelectronics
·
2022
·Vol. 15
·期 1
·1-10
·
IF 0
Jiang Mengjia,Li Shuyu,Zhen Chun,Wang Lingsong,Li Fei,Zhang Yihan,Dong Weibing,Zhang Xiaotao,Hu Wenping
Simultaneously realizing the optical and electrical properties of organic materials is always challenging. Herein, a convenient and promising strategy for designing organic materials with integrated optoelectronic properties based on cocrystal engineering has been put forward. By selecting the fluorene (Flu) and the 7,7′,8,8′-tetracyanoquinodimethane (TCNQ) as functional constituents, the Flu-TCNQ cocrystal prepared shows deep red emission at 702 nm, which is comparable to the commercialized red quantum dot. The highest electron mobility of organic field-effect transistor (OFET) based on Flu-TCNQ is 0.32 cm 2 V −1 s −1 . Spectroscopic analysis indicates that the intermolecular driving force contributing to the co-assembly of Flu-TCNQ is mainly charge transfer (CT) interaction, which leads to its different optoelectronic properties from constituents. Graphical Abstract
研究领域:
材料科学
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光学
·
电子工程
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产品关联
DOI
PubMed
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Renping Cao,Yuming Jiao,Xuantian Wang,Xun Ouyang,Huijun Wan,Ting Chen,Guotai Zheng,Shikun Xie
Novel Mg 2 La 3 NbO 9 :Mn 4+ powder phosphors are successfully synthesized by the high-temperature solid-state reaction method under ambient air. The crystal structure, morphology, decay lifetimes, time-resolved emission spectra, and luminescence properties are investigated. The excitation spectrum of Mg 2 La 3 NbO 9 :Mn 4+ phosphor monitored at 708 nm is observed in the region from 210 nm to 600 nm. Mg 2 La 3 NbO 9 :Mn 4+ phosphor with excitation at the ultraviolet (UV) and blue light can emit the far-red emission with the emission band peaking at ~708 nm because of the 2 E → 4 A 2 transition of Mn 4+ and the corresponding chromaticity coordinates (0.7322, 0.2678). The optimal doping concentration of Mn 4+ ion is ~0.6 mol%. The decay lifetime of Mg 2 La 3 NbO 9 :xMn 4+ phosphors decrease from 1.143 ms to 1.099 ms with increasing the Mn 4+ ion concentration from 0.2 mol% to 1.0 mol%. The good thermal stability of Mg 2 La 3 NbO 9 :Mn 4+ phosphor is confirmed by the temperature-dependent emission spectra. The luminous mechanism of Mg 2 La 3 NbO 9 :Mn 4+ phosphor is explained by using the Tanabe Sugano energy level diagram of Mn 4+ ion. All the experimental results imply that Mg 2 La 3 NbO 9 :Mn 4+ phosphor has a potential application in the white light-emitting diodes (LEDs) field.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 65
·40952-40956
·
IF 3.108
Chunlin Tan,Xiuya Su,Chao Zhou,Baoju Wang,Qiuqiang Zhan,Sailing He
Red-emitting carbon dots (C-dots) were synthesized from p-phenylenediamine (p-PD) aqueous solution with nitric acid (HNO3) assistance by hydrothermal reaction at 200 °C for 2 h. p-PD aqueous solution can be transferred to C-dots (or poly(p-PD)) with (or without) the addition of acid. Different acid systems, such as HNO3, H3PO4 and HF, can directly synthesize red-emitting C-dots, and the fluorescence can be enhanced by increasing the strength of acids. N-CDs, 3.46 nm-average-sized C-dots, prepared in dilute HNO3, have a quantum yield of 15.8% with unique, excitation-wavelength independent emission in the red region (600 and 680 nm) and a broad visible excitation band. Carboxyl, ester and hydroxyl groups on the C-dots surface directly lead to red emission. N-CDs have a certain selective specificity for Fe3+ detection and the linear range is 10–300 nmol L−1 with a limit of determination of 1.9 nmol L−1.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhenyu Tang,Peichang Ouyang,Yunfang Liu
Plant greenhouse planting has aroused great attention to the development of plant growth light-emitting diode (LED) light source. Far-red emitting phosphors as the main component of plant growth LED lighting have been studied more and more widely. In this study, Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ with far-red emission for plant LED lighting is synthesized in air. X-ray diffractometer (XRD) with the energy dispersive spectroscopy (EDS) is used to test XRD patterns, EDS, and the element mapping diagrams, confirming that Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ has a hexagonal crystal structure of with pure phase Li 1.6 Mg 1.6 Sn 2.8 O 8 . Photoluminescence excitation (PLE) spectrum, time-resolved PL spectra, decay curves, photoluminescence (PL) spectrum, as well as concentration and temperature dependent PL spectra are investigated in detail. Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ under excitation at 305 nm shows far-red emission peaking at ∼702 nm due to the transition 4 T 1 ( 4 G) → 6 A 1 ( 6 S) of Fe 3+ ion in octahedron [FeO 6 ]. PL spectrum of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ matches with the absorption spectra of plants during the process of photosynthesis, indicating a promising application of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ in plant growth LED lighting. Time-resolved PL spectra prove the only luminescence center (Fe 3+ ). Concentration dependent PL spectra confirm the optimal Fe 3+ concentration (0.8 mol%) and the concentration quenching mechanism is analyzed. The temperature dependent PL spectra show good thermal stability of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ and the heat quenching mechanism is explained.
研究领域:
材料科学
·
园艺学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Wenli Gao,Haohan Song,Xiao Wang,Xiaoqiang Liu,Xiaobin Pang,Yanmei Zhou,Bin Gao,Xiaojun Peng
Red emissive carbon dots (CDs) have drawn more and more attention due to their good organ penetration depth and slight biological tissue photodamage. Herein, the fluorescent CDs with red emission were synthesized by the facile one-pot hydrothermal treatment of citric acid and neutral red and they show red fluorescence both in aqueous solution and solid state. The solution of CDs exhibits the quantum yield of 12.1%, good stability against photobleaching, and low cytotoxicity. As-prepared CDs can be used as a fluorescent probe for peculiar detection of Pt2+, Au3+, and Pd2+. Furthermore, the CDs show excellent biocompatibility, which were successfully used as hopeful bioimaging and biosensing of noble metal ions in PC12 cells and zebrafish.
研究领域:
分析化学
·
生物医学
·
材料科学
✓ 已验证
DOI
高影响因子
Light-Science & Applications
·
2022
·Vol. 11
·期 1
·1-11
·
IF 20.257
Li Pengfei,Xue Shanshan,Sun Lu,Zong Xupeng,An Li,Qu Dan,Wang Xiayan,Sun Zaicheng
Carbon dots (CDs) as the advancing fluorescent carbon nanomaterial have superior potential and prospective. However, the ambiguous photoluminescence (PL) mechanism and intricate structure-function relationship become the greatest hindrances in the development and applications of CDs. Herein, red emissive CDs were synthesized in high yield from o -phenylenediamine (oPD) and catechol (CAT). The PL mechanism of the CDs is considered as the molecular state fluorophores because 5,14-dihydroquinoxalino[2,3-b] phenazine (DHQP) is separated and exhibits the same PL properties and behavior as the CDs. These include the peak position and shape of the PL emission and PL excitation and the emission dependence on pH and solvent polarity. Both of them display close PL lifetime decays. Based on these, we deduce that DHQP is the fluorophore of the red emissive CDs and the PL mechanism of CDs is similar to DHQP. During the PL emission of CDs, the electron of the molecule state can transfer to CDs. The formation process of DHQP is further confirmed by the reaction intermediates (phthalazine, dimers) and oPD. These findings provide insights into the PL mechanism of this type of CDs and may guide the further development of tunable CDs for tailored properties.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2016
·Vol. 122
·期 4
·1-6
·
IF 1.444
Cao Renping,Ceng Dong,Liu Pan,Yu Xiaoguang,Guo Siling,Zheng Guotai
LaAlO 3 :Mn 4+ and LaAlO 3 :Mn 4+ , Na + deep red-emitting phosphors are synthesized by a solid-state reaction method in air. Their crystal structures, lifetimes, and luminescence properties are investigated, respectively. PLE spectrum monitored at 730 nm contains three PLE bands peaking at ~276, 325, and 500 nm within the range 200–550 nm, and PL spectrum with excitation 325 nm exhibits two PL band peaks located at ~703 and 730 nm owing to anti-stokes vibronic sidebands associated with the excited state 2 E of Mn 4+ ion and the 2 E → 4 A 2 transition of Mn 4+ ion, respectively. The optimal Mn 4+ doping concentration is ~0.8 mol%. Lifetime of LaAl 0.992 O 3 :0.8 %Mn 4+ phosphor is ~0.92 ms. Na + ion as charge compensator can improve obviously the luminescence properties of LaAlO 3 :Mn 4+ phosphor due to the charge compensation. The luminous mechanism of Mn 4+ ion is explained by using Tanabe–Sugano diagram of Mn 4+ ion in octahedral crystal field. The contents of this paper will be helpful to develop novel Mn 4+ -doped materials and improve their luminescence properties.
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 THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 6
·2721-2729
·
IF 3.784
Xianju Zhou,Jie Zhang,Lingni Chen,Yanhong Li,Guotao Xiang,Sha Jiang,Li Li,Xiao Tang,Zhongmin Cao,Guangxin Xie
A series of novel red emission phosphors Sr 3 Lu 1- x (VO 4 ) 3 : x Eu 3+ ( x = 0.007, 0.009, 0.02, 0.04, 0.06) were synthesized successfully by traditional high-temperature solid-state reaction. The results of X-ray diffraction (XRD) reveal the doped Eu 3+ ions have replaced the lattice sites of Lu 3+ ions. The diffuse reflectance spectra illustrate the energy gap of Sr 3 Lu(VO 4 ) 3 host is 3.61 eV. The room-temperature steady-state fluorescence spectra show that these phosphors can be effectively pumped by the charge-transfer band (CTB) of the host in near ultraviolet (NUV) spectral region and then produce strong and pure red emission at 615 nm originated from 5 D 0 → 7 F 2 electric dipole transition of Eu 3+ . The Commission Internationale de L’Eclairage (CIE) coordinates of Sr 3 Lu 0.96 (VO 4 ) 3 :0.04Eu 3+ are (x = 0.65, y = 0.35), which are very close to the red standard of National Television Standards Committee NTSC (0.67, 0.33). The fabricated warm white-light-emitting diodes (LED) demonstrate high color-rendering index Ra as 93. The results imply the red-emitting Sr 3 Lu(VO 4 ) 3 :Eu 3+ phosphors could be potentially utilized in the fields of solid-state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 12
·10453-10460
·
IF 2.324
Yuan Rongrong,Liu Jianming,Xiang Weidong,Liang Xiaojuan
Various luminescent carbon materials are artificially synthesized and as admirable fluorescent materials because of the increased research of carbon nanodots (CDs). Herein, a novel solvent-dependent red CDs (rCDs) is introduced through solvothermal method. The as-prepared rCDs remain benzene structure and possess abundant surface function groups that endow them well solubility in various solvents. Furthermore, multicolor luminescence are observed when rCDs are dissolved in different solvents, and the emission wavelength of these materials can be well-tuned from 475 to 624 nm, which presents intensity solvent-dependent properties. Red luminescence carbon phosphors are successfully synthesized by mix rCDs with silica powder. Finally, warm white light emitting diodes (WLEDs) are constructed using rCDs powder with Ce 3+ : YAG single crystal and blue GaN chips. The results demonstrate that the rCDs can act as red component to modify the correlated color temperature (CCT) and the color rendering index (CRI) of WLEDs .
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
危险品化学品经营许可证（带存储）