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Luminescence: the Journal of Biological and Chemical Luminescence

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https://www.readbyqxmd.com/read/30421859/carbon-dots-involved-chemiluminescence-recent-advances-and-developments
#1
REVIEW
Dong Mei Wang, Ke Li Lin, Cheng Zhi Huang
In recent years, more and more nanomaterials-based chemiluminescence (CL) systems have appeared to improve the sensitivity and expand the scope of the analytical applications with the explosive growth and development of nanomaterials and technology. As a fascinating class of luminescent carbon nanomaterials, carbon dots (CDs) are now substantially studied in fabricating CL based assays due to their unique optical and mechanical properties. Herein, we summarize and highlight the current developments of CDs-involved weak or ultraweak CL systems, as well as the corresponding mechanisms and proper applications in some fields...
November 13, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30421538/red-and-green-emitting-nano-clay-materials-doped-with-eu-3-and-or-tb-3
#2
Hellen S Santos, Tero Laihinen, Lucas C V Rodrigues, Jari Sinkkonen, Ermei Mäkilä, Pia Damlin, Liana K O Nakamura, Hermi F Brito, Jorma Hölsä, Mika Lastusaari
Trivalent europium (Eu3+ ) and terbium (Tb3+ ) ions are important activator centers used in different host lattices to produce red and green emitting materials. The current work shows the design of new clay minerals to act as host lattices for rare earth (RE) ions. Based on the hectorite structure, nano-chlorohectorites and nano-fluorohectorites were developed by replacing the OH- present in the hectorite structure with Cl- or F- , thus avoiding the luminescence quenching expected due to the OH- groups. The produced matrices were characterized through X-ray powder diffraction (XPD), transmission electron microscopy (TEM), FT-IR, 29 Si MAS (magic angle spinning) NMR, nitrogen sorption, thermogravimetry-differential scanning calorimetry (TGA-DSC) and luminescence measurements, indicating all good features expected from a host lattice for RE ions...
November 13, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30403000/photophysics-and-photodynamics-of-pyronin-y-in-n-alcohols
#3
Burcu Meryem Beşer, Yavuz Onganer, Mustafa Arik
The photophysical properties and photodynamics of Pyronin Y (PyY) dye compound in seven polar protic solvents (n-alcohols) were examined as a function of temperature by using UV-visible, steady-state and time-resolved fluorescence spectroscopy techniques. To understand dye-solvent interactions, photophysical parameters including Stokes' shifts, fluorescence quantum yields and fluorescence lifetimes were determined. To examine the effect of solvent polarity, the difference between the ground state dipole moment and the excited state dipole moment was determined...
November 6, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30402901/application-of-modified-mesoporous-boehmite-%C3%AE-alooh-with-green-synthesis-carbon-quantum-dots-for-a-fabrication-biosensor-to-determine-trace-amounts-of-doxorubicin
#4
Behzad Rezaei, Zahra Hassani, Marzieh Shahshahanipour, Ali A Ensafi, G Mohammadnezhad
An important form of carbon nanoparticles that are used for a wide range of applications, are carbon dots (CDs). In this study, a very easy, in expensive and green process was described for the preparation of CDs by using hydrothermal treatment of Tragacanth Gum (TG). A rapid assay for the determination of trace amounts of an anticancer medication doxorubicin (DOX) was developed, based on the quenching of the CDs derived from their aggregation. Electrostatic interaction between CDs and DOX could lead to fluorescence quenching...
November 6, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30402900/tunable-luminescent-properties-of-bagd-2-o-4-eu-3-scintillating-phosphors-by-pr-3-codoping
#5
Xin-Yuan Sun, Shou-Bao Zhu, Fen Xiao, Shen-Lin Zhou, Lu-Nong Li
BaGd2 O4 :Eu3+ scintillating phosphors by Pr3+ -codoping were synthesized at 1300°C in air using a solid-state reaction method. The as-synthesized phosphors were characterized by X-ray diffraction (XRD), photoluminescence (PL) including excitation and emission spectra, radioluminescence (RL) spectra excited by X-ray and thermoluminescence (TL) spectra. Both the PL and RL spectra are composed of the featured trivalent europium (Eu3+ ) without any praseodymium (Pr3+ ) ions, and the PL and RL intensities as well as the lifetimes of BaGd2 O4 :Eu3+ scintillating phosphors decrease dramatically with an increasing concentration of Pr3+ ions...
November 6, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30378245/radiation-effect-on-cathodoluminescence-and-thermoluminescence-emission-of-ca-rich-oxalates-from-the-human-body
#6
Virgilio Correcher, Celine Briatte, Cecilia Boronat, Javier Garcia-Guinea
The radiation effect of luminescence emission of Ca-rich oxalate biogenic materials (gallbladder and renal calculi) and a commercial standard sample (CaC2 O4 ·H2 O) is reported. The samples were characterized by environmental scanning electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetric and differential thermal analyses, display complex cathodoluminescence (CL) and thermoluminescence (TL) glow emissions. CL spectra (in the UV-infrared range) displayed non-well defined peaks, and exhibited emission at: (i) higher energies (300-490 nm) mainly associated with non-bridging oxygen hole centers, oxygen-deficient centers and peroxy intrinsic defects, regardless of the sample; and (ii) higher, narrow and sharp wavebands, in the red region, probably induced by the presence of traces of Sm3+ (4 G5/2 →6 H9/2 transition) and/or Tb3+ (5 D4 →7 F3 transition) only for mineral-like materials in the human body...
October 31, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30378250/chemiluminescence-based-aptasensors-for-various-target-analytes
#7
REVIEW
Yue Sun, Jianzhong Lu
Aptamers (DNA or RNA) have complex three-dimensional shapes that can bind to specific targets. Relative to antibodies, aptamers benefit from their low cost of production, easy chemical modification, high chemical stability, reproducibility, and low levels of immunogenicity and toxicity. However, the true value of aptamers lies in their simplicity by which these molecules can be engineered into sensors as bio-recognition elements in diagnostics, drug discovery and therapy, environmental monitoring and food quality testing, etc...
October 30, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30378243/synthesis-and-characterization-of-a-green-light-emitting-pbi-br-2-ir-acac-metal-complex-for-oleds
#8
Neha Khotele, N Thejo Kalyani, S J Dhoble
We designed and synthesized a 2-(4-bromophenyl)-1-phenyl-1H-benzimidazole (pbi-Br) ligand, which was then employed to create an innovative phosphorescent cyclometallated iridium(III) (pbi-Br)2 Ir(acac) metal complex with acetyl acetone as an ancillary ligand using the Suzuki coupling reaction. The complex was then characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectra and thermogravimetric analysis (TGA)/differential thermal analysis (DTA) for structural and thermal analysis, respectively...
October 30, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30378241/synthesis-characterization-and-optical-property-investigation-of-cds-nanoparticles
#9
D B Bharti, Avinash V Bharati, Atul V Wankhade
Microwave-assisted routes have attracted much attention for nanoparticle synthesis because of minimal solvent use and rapid, high efficiency and controlled morphology. Cadmium sulphide (CdS) nanoparticles form the line between bulk and molecular states of materials and show variation in their physical and chemical properties. Cadmium sulphate and thiourea were used as precursors during this synthesis. These are included in the category of practical semiconductor metal sulphides, which are extensively used as catalysts and optical materials...
October 30, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30378237/validated-spectrophotometric-and-spectrofluorimetric-methods-for-determination-of-dapoxetine-hydrochloride-and-dosulepin-hydrochloride-in-their-dosage-forms-using-mercurochrome
#10
REVIEW
Heba Samir Elama, Fawzi Abdalla Elsebaei, Fatma Alzahraa Ahmed Ali, Amina Mohamed El-Brashy
Validated, simple, rapid and sensitive spectrophotometric and spectrofluorimetric methods were developed for the determination of dapoxetine HCl and dosulepin HCl. The spectrophotometric method (I) was based on a binary complex formation between each drug and mercurochrome (MER) in acetate buffer (pH 3.5) with maximum absorbance at 557 nm. Calibration graphs were linear over the range 2.0-20.0 and 2.0-24.0 μg/ml, detection limits were 0.23 and 0.41 μg/ml and quantitation limits were 0.71 and 1.26 μg/ml for dapoxetine HCl and dosulepin HCl, respectively...
October 30, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30362269/convenient-and-ultra-sensitive-fluorescence-detection-of-bovine-serum-albumin-by-using-rhodamine-6g-modified-gold-nanoparticles-in-biological-samples
#11
Vikas Kumar Verma, Kavita Tapadia, Tungabidya Maharana, Ashima Sharma
This study comprises a convenient, rapid and very sensitive method for the determination of bovine serum albumin (BSA). The technique is based on fluorescence resonance energy transfer (FRET) between Rhodamine-6G (R6G) acting as donor and gold nanoparticles (AuNPs) acting as acceptors. This method takes advantage of AuNPs that have high quenching efficiency, therefore the absorption spectra range shifts from 521 to 635 nm when aggregation of the AuNPs takes place. Furthermore, when R6G was electrostatically self-adsorbed to the citrate-stabilized AuNPs surface the fluorescence intensity was quenched...
October 25, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30362233/effect-of-gd-3-bi-3-or-sm-3-on-luminescent-properties-of-la-2-x-mgtio-6-xeu-3-phosphors
#12
Huidong Xie, Binbin Su, Yurong Tan, Yajuan Zhao, Shouning Chai
Single phase of Bi3+ , Gd3+ , Sm3+ and Eu3+ co-doped La2 MgTiO6 red phosphors were synthesized by high temperature solid-state method. The phase composition, morphology and fluorescent properties of the phosphors were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrometer. The La2-x MgTiO6 :xEu3+ phosphors can be excited by UV (396 nm) and blue (465 nm) light-emitting diode (LED) chips and show a strong red emitting with dominated wavelength at 615 nm. The optimum doping concentration of Eu3+ ion for La2 MgTiO6 is x = 0...
October 25, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30362232/validated-spectroscopic-methods-for-the-estimation-of-triamterene-in-bulk-powder-and-capsule-form-via-derivatization-reactions
#13
Fawzia A Ibrahim, Manal M Fouad, Noha S Rashed, Mona E Fathy, Ebtesam S Mahmoud
Sensitive, simple and specific spectrophotometric and spectrofluorimetric methods were developed for the determination of triamterene in bulk powder and pharmaceutical dosage form. The spectrophotometric method (Method A) is based on the formation of an ion-pair complex with eosin Y in acetate buffered solution of pH 3.7 followed by measuring the absorbance at 545 nm. The absorbance-concentration plot is rectilinear over the range 3.0-15.0 μg/mL with a limit of detection (LOD) of 0.429 μg/mL and a limit of quantitation (LOQ) of 1...
October 25, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30350338/two-validated-spectrofluorimeteric-and-high-performance-liquid-chromatography-hplc-methods-with-fluorescence-detection-for-the-analysis-of-a-new-anti-hepatitis-c-drug-daclatasvir-hydrochloride-in-raw-material-or-tablet-form-and-in-biological-fluids
#14
Rasha Aboshabana, Shereen Shalan, Manal Eid, Nahed El-Enany
Two sensitive and accurate methods have been developed for the estimation of daclatasvir (DAC) in its raw material, dosage form and in biological fluids. Method I is based on the measurement of DAC native fluorescence in methanol at 385 nm after excitation at 315 nm. The relationship between fluorescence intensity and concentration was found to be rectilinear over the linearity range (3.0-30.0 ng/ml). There were good per cent recoveries both in the dosage form (99.87 ± 0.84) and in spiked human plasma (99...
October 23, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30328250/carbon-dot-based-fluorescent-probes-for-sensitive-and-selective-detection-of-luteolin-through-the-inner-filter-effect
#15
Qianqian Sun, Yuwei Long, Shuang Pan, Hui Liu, Jidong Yang, Xiaoli Hu
As a flavonoid, luteolin (LTL) has been universally studied due to its many advantages. Luteolin is a component in drugs and accurate detection is important to determine their LTL content and estimate their disposal effects. In our study, we found that the strong fluorescence of CDs made using ammonium citrate with the quantum yield (QY) of 8.8%, could be quenched sharply by LTL through the inner filter effect (IFE), and therefore a fluorescence assay for LTL detection using CDs as probes was devised. In this fluorescence assay, the limit of detection (LOD) was 0...
October 16, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30328244/influence-of-the-kbr-matrix-on-the-luminescence-properties-of-cdte-quantum-dots
#16
Galyna Okrepka, Yuriy Khalavka, Yulia Seti
The investigation of the luminescence properties of CdTe/KBr composites with encapsulated quantum dots (QDs) of different sizes was performed and the influence of the KBr matrix on the luminescence properties of CdTe QDs was studied. Encapsulation of nanoparticles by a solid matrix caused a bathochromic shift in the luminescence peak and the shift value was the larger the smaller the size of the quantum dots. Interband quantum transition theory was used to explain the influence of the matrix on the luminescence properties of the capsulated CdTe QDs...
October 16, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30328243/the-self-reduction-synthesis-and-luminescent-properties-of-eu-2-eu-3-activated-bazr-x-si-3-o-7-2x-phosphors-with-white-light-emission-for-white-light-emitting-diodes
#17
Jianlin Zhong, Lixin Yu, Xiaoqin Man, Wei Sun, Xiao Wu, Xiaofang Jiang, Zhengyu Gao, Qihuang Guo, Yingxuan Zou
The BaZrx Si3 O7+2x :Eu2+ /Eu3+ (2%, molar ratio) phosphors were prepared with adding different amounts of zirconium dioxide (ZrO2 ) (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) by a self-reduction method under air conditions. X-ray diffraction, photoluminescence properties, thermal quenching properties and luminescent lifetimes of the prepared samples were systematically analyzed. In BaZrx Si3 O7+2x :Eu2+ /Eu3+ , both the 4f → 5d transitions of Eu2+ and sharp emissions assigned to 5 D0 → 7 FJ (J = 0, 1, 2, 3, 4) transitions of Eu3+ were observed...
October 16, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30318859/divalent-eu-2-ion-an-effective-inorganic-mediator-of-energy-transfer-from-the-primary-chemiluminescence-emitter-3-me-2-chc-h-o-on-tb-3-and-ru-bpy-3-2-ions
#18
D I Galimov, S M Yakupova, R G Bulgakov
This study demonstrated for the first time that chemiluminescence (CL) from oxidation of Bui 2 AlH (Bu = C4 H9 ) using oxygen from tetrahydrofuran (THF) was significantly enhanced by the addition of Ru(bpy)3 2+ . A quantitative comparison of the enhancement efficiency of this CL was performed by addition of ionic phosphors Eu2+ , Tb3+ and Ru(bpy)3 2+ . CL enhancement was caused by energy transfer from the primary CL emitter (3 Me2 CHC(H)=O* aldehyde) to these ionic phosphors. The CL efficiency enhancement was in the order: Eu2+ (8...
October 14, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30302897/thermoluminescence-properties-of-la-3-gd-3-dy-3-and-ho-3-co-doped-mgal-2-si-2-o-8-mn-4
#19
Erdem Uzun, Esra Öztürk, Nilgün Kalaycioglu Ozpozan
Thermoluminescence properties of Mn4+ -doped and La3+ , Gd3+ , Dy3+ and Ho3+ co-doped MgAl2 Si2 O8 host phosphors were investigated in detailed and reported for the first time. The phosphors were exposed to β- and α-irradiation and the glow curves appeared at 260-262 ± 2°C and 245-252 ± 2°C, respectively. Thermoluminescence analysis show that the main glow peaks actually consisted of three distinct peaks (P1 , P2 and P3 ). In addition, all the phosphors had a main peak, and many satellite peaks also appeared up to 200°C...
October 9, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30302895/adjusting-the-structure-and-luminescence-properties-of-sr-2-x-ba-x-mgal-22-o-36-eu-2-phosphors-by-sr-ba-ratio
#20
Qiang Wang, Zhongfei Mu, Shaoan Zhang, Xing Feng, Qingtian Zhang, Daoyun Zhu, Qingping Du, Fugen Wu
Europium ion (Eu2+ )-doped phosphors exhibit adjustable photoluminescence due to the sensitivity of their luminescence to the local environment. It is of great significance to adjust the luminescence of Eu2+ by changing their local environment in the host. In this work, we investigated the effect of strontium/barium (Sr:Ba) ratio on the structure and luminescence properties of Sr2-x Bax MgAl22 O36 :Eu2+ phosphors. Our investigation indicates that with the decrease of Sr:Ba ratio, the matrix lattice gradually expands and the peak wavelength for the luminescence of Eu2+ presents an obvious blue shift...
October 9, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
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