DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12892-12898
·
IF 4
Chaojie Li,Małgorzata Sójka,Jiyou Zhong,Jakoah Brgoch
Rapid, non-destructive food-quality analysis using near-infrared (NIR) photoluminescence spectroscopy produced by phosphor-converted light-emitting diodes (pc-LEDs) has fascinating prospects for future food-safety monitoring. However, covering the energy window for organic molecular vibrations of interest in these applications requires NIR-emitting phosphors that are highly energy-efficient with ultra-broadband photoluminescence. This remains a materials design challenge. Here, a Cr3+-substituted garnet phosphor, Mg3Gd2Ge3O12, is found to possess a desired broadband NIR emission (λem = 815 nm, fwhm = 172 nm; 2513 cm−1) covering from 700 nm to 1200 nm with a photoluminescence quantum yield of 60.8% and absorption efficiency of 44.1% (λex = 450 nm). Fabricating a prototype NIR pc-LED device using the title material combined with a 455 nm emitting InGaN LED chip produces a NIR output power of 23.2 mW with photoelectric efficiency of 8.45% under a 100 mA driving current. This NIR light source is then used to demonstrate the quantitative detection of ethanol in solution. These results highlight the feasibility of this material for NIR spectroscopy and validate the prospects of using NIR pc-LEDs in food-quality analysis.
研究领域:
分析化学
·
食品科学
·
光电子材料
·
分子光谱学
·
食品安全
·
材料科学
·
光学传感
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2014
·
IF 2.129
Yanhua Tong,Feng Cao,Jintian Yang,Minhong Xu,Chu Zheng,Xingyu Zhu,Di Chen,Min Zhang,Fan Huang,Jie Zhou,Lixiao Wang
Pristine and erbium-doped ZnS urchinlike hierarchical nanostructures were successfully synthesized via a chemical solution route. Morphologies of ZnS products have been controlled by adjusting sulfur source and the ratio of ethylene glycol to water by volume. The crystal structures, morphologies and chemical composition of samples were analyzed by X-ray powder diffraction, transmission electron microscopy and atomic emission spectrometry . The photoluminescence (PL) properties of samples were analyzed by spectrofluorometer. It was first found that its broad blue emission is originated not from zinc vacancies or just sulfur vacancies but from sulfur vacancies as well as extended sulfur-vacancy states. PL emission spectra of Er-doped ZnS urchinlike architectures indicated that Er doping can increase sulfur vacancies and extended sulfur-vacancy states. Photocatalytic experiments demonstrate that ZnS with 0.1 atomic% of Er 3+ performs the best photocatalytic activity . Photogenerated carriers transfer from outer surface to organic molecules and recombination inside ZnS were investigated by adsorbance and PL spectra, respectively. The results suggest that strong adsorptivity of Er-doped ZnS facilitates the transfer of photogenerated carriers from surface of ZnS to dye molecules; however, higher content of Er could in turn assists photogenerated electron–hole recombination inside ZnS.
研究领域:
材料科学
·
光学
·
纳米技术
·
化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 34
·7001-7012
·
IF 0
Wen-Liang Gong,Bo Wang,Matthew. P. Aldred,Chong Li,Guo-Feng Zhang,Tao Chen,Lei Wang,Ming-Qiang Zhu
In this paper, the bromination of carbazole has been controlled and then subsequent mono, di, tri and tetra-bromocarbazoles have been subjected to Suzuki cross-coupling to yield a series of carbazole-tetraphenylethene (TPE) materials with varying numbers of peripheral TPE groups. Accompanied by 2,7-dibromo-carbazole, five new Cz-TPE materials are successfully synthesized. All the Cz-TPEs are non-fluorescent in THF and emit strong blue-green fluorescence in aggregate states (fw = 90%) and thin films because of their aggregation induced emission (AIE) nature. In THF (10−5 M) solution, all the Cz-TPEs emit deep blue fluorescence after UV irradiation and we find that the more the TPE groups, the slower the enhancement of fluorescence. In thin films (40 nm), the emission maximum blue shift decreases and finally becomes non-emissive after about 1.5 h of UV irradiation for all the Cz-TPEs. We suppose these optical properties are attributed to photo-induced irreversible changes of TPE to diphenylphenanthrene derivatives. The photo-oxidation process for Cz-1TPE has been investigated and proved by HPLC analysis, 1H NMR and LS-MS. Electrochemical properties of all the Cz-TPEs are investigated by cyclic voltammetry and with UV-absorption spectra, and their energy levels are calculated. Finally, we applied the Cz-TPEs to organic light emitting diode (OLED) devices by the spin coating deposition process with OLED devices configuration: ITO/PEDOT (40 nm)/Cz-TPEs (50 nm)/TPBi (40 nm)/LiF (1 nm)/Al (100 nm). All EL devices emit blue-green light with a maximum luminance (Lmax) of 2858, 1353, 986, 2088 and 1129 cd m−2, a maximum current efficiency (ηc,max) of 3.5, 4.9, 3.1, 3.1 and 5.5 cd A−1, a maximum power efficiency (ηP,max) of 2.1, 3.9, 2.2, 1.8 and 3.1 lm W−1 and a turn on voltage (Von) of 3.5, 3.5, 3.3, 3.6 and 4.2 V for Cz-1TPE, Cz-2TPE, Cz-3TPE, Cz-4TPE, Cz-2TPE (2,7), respectively.
研究领域:
有机化学
·
材料科学
·
光电材料
✓ 已验证
DOI
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 7
·071513
·
IF 4.316
Xiayu Lu,Li Liu,Yu Cui,Fuhui Wang
TiO2 p-n heterojunctions modified with zeolitic imidazolate framework-67 (ZIF-67), a metal-organic framework, were successfully fabricated by a solution self-assembly method, and their photoelectrochemical and photocathodic performance was investigated. The presence of the organic ligands in ZIF-67 enabled ZIF-67-TiO2 photoanodes to exhibit excellent stable cathodic protection performance under simulated sunlight illumination compared with traditional organic or inorganic cocatalysts. ZIF-67-TiO2 photoanodes could provide 12 h of effective and stable photocathodic protection for 304 stainless steel (304SS) in 3.5 wt% NaCl solution. Experimental results revealed that the morphology of ZIF-67 cocatalysts affected the photoelectrochemical performance of ZIF-67-TiO2 photoanodes. Compared with large (∼900 nm) ZIF-67-modified TiO2, small (∼115 nm) ZIF-67-modified TiO2 demonstrated an upwardly shifted conduction band (CB) and faster separation and migration of photogenerated carriers. Furthermore, a photoanode made from small ZIF-67-modified TiO2 exhibited a lower photogenerated potential (−0.37 V) than the photoanodes made from large ZIF-67-modified TiO2 and TiO2, this photoanode could provide more effective photocathodic protection for 304SS.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Cheng-Yu Li,Di Cao,Ya-Feng Kang,Yi Lin,Ran Cui,Dai-Wen Pang,Hong-Wu Tang
We present an analytical platform by combining near-infrared optical tweezers with two-photon excitation for fluorescence detection of H5N1 virus gene sequences. A heterogeneous enrichment strategy, which involved polystyrene (PS) microsphere and quantum dots (QDs), was adopted. The final hybrid-conjugate microspheres were prepared by a facile one-step hybridization procedure by using PS microspheres capturing target DNA and QDs tagging, respectively. Quantitative detection was achieved by the optical tweezers setup with a low-cost 1064 nm nanosecond pulse laser for both optical trapping and two-photon excitation for the same hybrid-conjugate microsphere. The detection limits for both neuraminidase (NA) gene sequences and hemagglutinin (HA) gene sequences are 16–19 pM with good selectivity for one-base mismatch, which is approximately 1 order of magnitude lower than the most existing fluorescence-based analysis method. Besides, because of the fact that only signal from the trapped particle is detected upon two-photon excitation, this approach showed extremely low background in fluorescence detection and was successfully applied to directly detect target DNA in human whole serum without any separation steps and the corresponding results are very close to that in buffer solution, indicating the strong anti-interference ability of this method. Therefore, it can be expected to be an emerging alternative for straightforward detecting target species in complex samples with a simple procedure and high-throughput.
研究领域:
生物技术
·
分子生物学
·
光学分析
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 10
·期 4
·1225-1237
·
IF 7.779
Rui Hu,Yan Zhao,Ying Zhang,Xusheng Wang,Guorong Li,Mingxue Deng
The demand for multidimensional stimulus sensing devices that can be used for the real-time monitoring of the equipment status in complex working environments has led to investigations on multifunctional optoelectronic materials. Nevertheless, the exploitation of all-in-one materials with multimode and multicolor luminescence capacities is still immature. Given the abundant transitions in lanthanide ions and the stress-responsive ability of piezoelectric crystals, multi-activator-doped piezoelectric materials are promising candidates for multifunctional detection based on luminescence characteristics. Herein, we report a novel multidimensional stimulus-sensitive material constructed via combining dual luminescence centers (Bi3+/Er3+) with piezoelectric LiTaO3, thus realizing opto-mechano-thermo-responsive luminescence in a single material. Particularly the photoluminescence is allochroic (cyangreen-yellow) under diverse excitation sources (ultraviolet-blue-near infrared radiation). Its mechanoluminescence performance shows a linear relation with the applied load, allowing its application in stress sensing. In addition, the thermally coupled levels of Er3+ dopants endow the LiTaO3 material with temperature sensing capacity relying on the fluorescence intensity ratio. These findings provide a new method for designing optical function materials and integrated optoelectronic devices toward radiative, stress, and temperature sensing applications.
研究领域:
材料科学
·
光学
·
传感器技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 109
·107263-107269
·
IF 3.289
Bo Li,Yali Guo,Anam Iqbal,Yaping Dong,Wu Li,Weisheng Liu,Wenwu Qin,Yabin Wang
Excitation-dependent luminescence (EDE) or excitation-independent luminescence (EIE) property of carbon dots (CDs) has attracted considerable attention. For the first time, we found that nitrogen doped CDs possess adjustable EDE and EIE properties by changing the corresponding environmental pH values for photoluminescence (PL) properties. Structural characterizations and property tests demonstrate that the unique photoluminescence properties of CDs can be attributed to the synergistic effect from the PL centers in the carbon core and on the surface. Doping nitrogen into the carbon core improves the emission efficiency of PL centers; these enhanced PL sites can even dominate fluorescence emission. Passivated surfaces of CDs modified with amino groups not only further boost the emission efficiency, but also make energy levels of PL centers more uniform. In addition, the mechanism of synergistic effect is investigated, which opens up the possibility of designing CDs with desirable PL characteristics. Such nitrogen-doped CDs with adjustable excitation-related luminescence properties have potential applications in detecting acidity or alkalinity of a certain physiological environment by intuitively observing the change in the wavelength.
研究领域:
材料科学
·
光学
·
生物医学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 45
·17343-17352
·
IF 8.067
Shao Yan,Yanjie Liang,Yi Zhang,Bibo Lou,Jingwei Liu,Dongxun Chen,Shihai Miao,Chonggeng Ma
Solar-blind ultraviolet-C (UVC; 200–280 nm) luminescent materials have exhibited great potential for wide applications in photomedicine and photochemistry due to the unique spectral features of UVC light. However, it is still a challenging work to develop persistent phosphors emitting in the UVC spectral region owing to the lack of suitable host materials and emitting centers. Herein, we report a series of LiLuSiO4:Pr3+,Sm3+ UVC persistent phosphors that can be charged by a 254 nm UV lamp or a high-energy X-ray beam giving rise to long-lasting UVC light emission peaking at 280 nm. More importantly, a considerable enhancement of UVC afterglow intensity and decay time has been achieved by Sm3+ co-doping because the Sm3+ ions can act as effective electron traps, which has been verified by the spectroscopic investigations and first-principles calculations. On top of this, narrowband ultraviolet-B (NB-UVB) persistent luminescence with a line emission at 313 nm has also been realized by introducing Gd3+ into LiLuSiO4:Pr3+,Sm3+ persistent phosphors based on persistent energy transfer from Pr3+ to Gd3+. Considering that the UVC and NB-UVB persistent luminescence can fully avoid severe interference from ambient light, the as-prepared LiLuSiO4:Pr3+,Sm3+ and Li(Lu,Gd)SiO4:Pr3+,Sm3+ persistent phosphors can find promising applications as invisible identification taggants in a bright environment.
研究领域:
材料科学
·
光化学
·
医学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Sai-Nan Guo,Hao Wu,Dan Wang,Jie-Xin Wang
Lead halide perovskite quantum dots (QDs) are known as prospective optoelectronic device materials because of their excellent luminescence, extraordinary photoelectric performance, and specific octahedron framework. Herein, we report a cost-effective approach for synthesizing highly stable CH3NH3PbBr3 QDs in low-polarity binary solvents without nitrogen protection. The CH3NH3PbBr3 QDs are tunable from 1.2 to 4.2 nm by adjusting the proportion of oleic acid and oleylamine as capping ligands. The photoluminescence quantum yield of CH3NH3PbBr3 QDs can reach 87.4%. The fluorescence can maintain over 80% of its earliest emission intensity under the atmosphere after 5 days, which is much better than that (∼10%) of QDs with ligand-assisted reprecipitation. The possible reaction mechanism of preparing CH3NH3PbBr3 QDs was also addressed. Notably, such a strategy can be applied extensively in the preparation of other lead halide perovskite QDs. Furthermore, the as-prepared thick PMMA-coated CH3NH3PbBr3 QDs were further conjoined with a red luminescence powder on a blue InGaN chip to obtain a powerful efficiency (45.4 lm W–1) warm white light-emitting diode.
研究领域:
材料科学
·
光学工程
·
化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 12
·10219-10226
·
IF 3.277
Sheng-Ping Guo,Yang Chi,Jian-Ping Zou,Huai-Guo Xue
A new phase of EuZrS3 (α phase) was obtained via a high-temperature solid-state reaction. It crystallizes in the orthorhombic space group Pnma with a = 8.465(3), b = 3.808(1), c = 13.823(4) Å and V = 445.5(2) Å3, belonging to the NH4CdCl3 structure type. Its crystal structure features a 3-D network constructed by EuS8 bicapped trigonal prisms (bctps) and Zr4+ ions that occupy the octahedral cavities. Ultraviolet-visible-near infrared band gap analysis shows an energy gap of 1.09 eV, which is verified by electronic band structure calculations. A typical photoluminescence phenomenon of Eu2+ can be observed at 575 nm. The photocatalytic behavior of rod-like α-EuZrS3 crystals was investigated by decomposing methylene blue under visible light and simulated sunlight irradiation.
研究领域:
材料科学
·
无机化学
·
固体物理
·
光催化
·
半导体材料
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
S. Wu,Y. Fu,Q. Liu,P. Xiong,D. Wang,G. Zhang,S. Yuan,Y. Chen
Developing highly efficient cyan-emitting fluorescent materials is essential to bridge the cyan gap in phosphor-converted white light-emitting diodes for full-spectrum white illumination. Here, a Bi-doped cyan phosphor has been reported to solve this gap. The phase purity, photoluminescence emission/excitation spectra, concentration quenching, lifetime decay curves, and temperature-dependent photoluminescence emission spectra were systematically investigated. SrLaGaO 4 :Bi 3+ exhibits a broad excitation band (250–400 nm), which matches with the emission of a commercial near-ultraviolet light-emitting diode chip. The cyan light peaked at 475 nm is observed, which is attributed to the 3 P 1 → 1 S 0 transition of Bi 3+ . The thermal quenching experiment was performed, and the activation energy was calculated as 0.36 eV. Finally, full-spectrum white light-emitting diode devices were fabricated using SrLaGaO 4 :Bi 3+ phosphors, commercial blue BaMgAl 10 O 17 :Eu 2+ phosphor, green (Ba, Sr) 2 SiO 4 :Eu 2+ phosphor, and red CaAlSiN 3 :Eu 2+ phosphor, which displayed an International Commission on an illumination coordinate of (0.3732, 0.3850), a correlated color temperature of 4290 K, and a color rendering index of 93.2 at a drive current of 20 mA. This result indicates that SrLaGaO 4 :Bi 3+ plays an essential role in bridging the cyan gap, providing new inspiration for applying cyan-emitting phosphors in full-spectrum white lighting.
研究领域:
材料科学
·
光学工程
·
固态照明
·
发光材料
·
无机化学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2018
·
IF 7.051
Yan-Fang Guan,Chen Qian,Wei Chen,Bao-Cheng Huang,Yun-Jie Wang,Han-Qing Yu
Membrane fouling remains a major challenge for applying membrane technology to water treatment and, therefore, new tools to recognize the key foulants are essential for characterizing and evaluating the membrane fouling process. In this work, fluorescence excitation emission matrix coupled with parallel factor framework-clustering analysis was used to investigate the membrane fouling during the filtration process of humic acid (HA) and bovine serum albumin (BSA) solution by polyvinylidene fluoride membrane. Interestingly, the interaction between BSA and HA in the membrane fouling process was observed, and was further confirmed by infrared microspectroscopy and two-dimensional correlation spectroscopic analysis . In addition, the HA-induced membrane fouling was observed to be initially relieved, but became aggravated when a certain amount of BSA was added. Furthermore, with such an integrated approach, the O H groups in HA and amide bands in BSA were found to be mainly responsible for the membrane fouling and the HA-BSA interaction was mainly caused by the encapsulation of BSA with HA. This work develops a new method for probing membrane fouling and demonstrates the interaction between membrane foulants and its roles in membrane fouling process. Furthermore, the integrated approach developed in this work has a potential to explore other types of interfacial interactions.
研究领域:
环境科学
·
生物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）