ChemInform Abstract: Mild Hydrothermal Synthesis, Crystal Structure, Photoluminescence Properties and Emission Quantum Yield of a New Zirconium Germanate with Garnet-Type Structure.

ChemInform ◽  
2012 ◽  
Vol 43 (32) ◽  
pp. no-no
Author(s):  
Stanislav Ferdov ◽  
Rute A. S. Ferreira ◽  
Zhi Lin ◽  
Zhengying Wu
Keyword(s):  
Crystal Structure ◽  
Hydrothermal Synthesis ◽  
Quantum Yield ◽  
Type Structure ◽  
Photoluminescence Properties ◽  
Emission Quantum Yield

K3Eu5(PO4)6: hydrothermal synthesis, crystal structure and photoluminescence properties

2019 ◽  
Vol 75 (7) ◽  
pp. 883-890 ◽  
Author(s):  
Ya-Li Xue ◽  
Ai-Yun Zhang ◽  
Xiao-Yang Han ◽  
Xiao-Qi Cui ◽  
Ling Deng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrothermal Synthesis ◽  
Uv Light ◽  
Three Dimensional ◽  
Visible Region ◽  
Monoclinic Space Group ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Strong Luminescence ◽  
Light Excitation

An anhydrous orthophosphate, K3Eu5(PO4)6 (tripotassium pentaeuropium hexaphosphate), has been prepared by a high-temperature solid-state reaction combined with hydrothermal synthesis, and its crystal structure was determined by single-crystal X-ray diffraction analysis (SC-XRD). The results show that the compound crystallizes in the monoclinic space group C2/c and the structure features a three-dimensional framework of [Eu5(PO4)6]∞, with the tunnel filled by K+ ions. The IR spectrum, UV–Vis spectrum and luminescence properties of polycrystalline samples of K3Eu5(PO4)6, annealed at temperatures of 650, 700, 750, 800 and 850 °C, were investigated. Although with a full Eu3+ concentration (9.96 × 1021 ions cm−3), the self-activated phosphor K3Eu5(PO4)6 shows s strong luminescence emission intensity with a quantum yield of 37%. Under near-UV light excitation (393 nm), the series of samples shows the characteristic emissions of Eu3+ ions in the visible region from 575 to 715 nm. The sample sintered at 800 °C gives the strongest emission and its lifetime sintered at 800 °C (1.88 ms) is also the longest of all.

Di-amidosils with tunable structure, morphology and emission quantum yield: the role of hydrogen bonding

2015 ◽  
Vol 3 (26) ◽  
pp. 6844-6861 ◽  
Author(s):  
S. C. Nunes ◽  
J. Hümmer ◽  
V. T. Freitas ◽  
R. A. S. Ferreira ◽  
L. D. Carlos ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Variable Structure ◽  
Photoluminescence Properties ◽  
Experimental Conditions ◽  
Yield Value ◽  
Structure Morphology ◽  
Tunable Structure ◽  
Degree Of Order ◽  
Emission Quantum Yield

Di-amidosil hybrids with variable structure, morphology and photoluminescence properties were obtained using different experimental conditions. A correlation between the emission quantum yield value and the degree of order of the amide–amide hydrogen-bonded array was established for mono- and di-amidosils.

A general quantitative pH sensor developed with dicyandiamide N-doped high quantum yield graphene quantum dots

Nanoscale ◽  
2014 ◽  
Vol 6 (7) ◽  
pp. 3868-3874 ◽  
Author(s):  
Zhu Lian Wu ◽  
Ming Xuan Gao ◽  
Ting Ting Wang ◽  
Xiao Yan Wan ◽  
Lin Ling Zheng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Citric Acid ◽  
Hydrothermal Synthesis ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
Ph Sensor ◽  
Ph Sensitivity ◽  
High Quantum Yield ◽  
Photoluminescence Properties ◽  
Doped Graphene

Using citric acid and dicyandiamide, through a hydrothermal synthesis, we fabricated N-doped graphene quantum dots (GQDs), which possess excellent photoluminescence properties and pH sensitivity and developed a pH sensor for environmental and intracellular application.

scholarly journals N-heterocyclic carbene-stabilized Au13 superatom clusters

2018 ◽  
Author(s):  
Mina R. Narouz ◽  
Shinjiro Takano ◽  
Paul A. Lummis ◽  
Tetyana I. Levchenko ◽  
Ali nazemi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electronic Structure ◽  
Quantum Yield ◽  
Magic Number ◽  
Heterocyclic Carbenes ◽  
High Yield ◽  
Background Color ◽  
Stable Clusters ◽  
High Emission ◽  
Emission Quantum Yield

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; line-height: 20.0px; font: 17.4px Helvetica; color: #000000; -webkit-text-stroke: #000000; background-color: #ffffff} span.s1 {font-kerning: none} span.s2 {font: 11.2px Helvetica; font-kerning: none} span.s3 {font-kerning: none; color: #000000} <p>Magic number Au13 nanoclusters stabilized entirely by N-heterocyclic carbenes (NHCs) have been prepared by the bottom-up reduction of well-defined molecular NHC–Au–Cl complexes with sodium borohydride. The nature of the wingtip groups was shown to be critical in the preparation of stable clusters. The all NHC-clusters are prepared in high yield by this straight-forward method, display higher stability than related all phosphine clusters, and possess extremely high emission quantum yield. DFT analysis of these clusters based on the resolved crystal structure reveals their electronic structure as 8-electron superatoms.</p>

scholarly journals N-heterocyclic carbene-stabilized Au13 superatom clusters

2018 ◽  
Author(s):  
Mina R. Narouz ◽  
Shinjiro Takano ◽  
Paul A. Lummis ◽  
Tetyana I. Levchenko ◽  
Ali nazemi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electronic Structure ◽  
Quantum Yield ◽  
Magic Number ◽  
Heterocyclic Carbenes ◽  
High Yield ◽  
Background Color ◽  
Stable Clusters ◽  
High Emission ◽  
Emission Quantum Yield

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; line-height: 20.0px; font: 17.4px Helvetica; color: #000000; -webkit-text-stroke: #000000; background-color: #ffffff} span.s1 {font-kerning: none} span.s2 {font: 11.2px Helvetica; font-kerning: none} span.s3 {font-kerning: none; color: #000000} <p>Magic number Au13 nanoclusters stabilized entirely by N-heterocyclic carbenes (NHCs) have been prepared by the bottom-up reduction of well-defined molecular NHC–Au–Cl complexes with sodium borohydride. The nature of the wingtip groups was shown to be critical in the preparation of stable clusters. The all NHC-clusters are prepared in high yield by this straight-forward method, display higher stability than related all phosphine clusters, and possess extremely high emission quantum yield. DFT analysis of these clusters based on the resolved crystal structure reveals their electronic structure as 8-electron superatoms.</p>

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