Mechanically Induced Bright Luminescence from 1,2‐Dioxetane Containing PDMS Boosted by Fluoroboron Complex as an In‐Chain Fluorophore

2020 ◽  
pp. 2000575
Author(s):  
Yuan Yuan ◽  
Baohua Di ◽  
Yulan Chen
Keyword(s):  
Bright Luminescence

Bright Luminescence of Sb Doping in All-Inorganic Zinc Halide Perovskite Variant

2021 ◽  
pp. 162610
Author(s):  
Xiaoyu Wang ◽  
Qibin Shen ◽  
Yansong Chen ◽  
Nasir Ali ◽  
Ziyang Ren ◽  
...  
Keyword(s):  
Sb Doping ◽  
Halide Perovskite ◽  
Bright Luminescence

scholarly journals Spontaneous transitions to enhanced fluorescence for GeV centers in a single microcrystalline diamond

2018 ◽  
Vol 190 ◽  
pp. 04012
Author(s):  
Natalia A. Lozing ◽  
Maxim G. Gladush ◽  
Ivan Yu. Eremchev ◽  
Eugeniy A. Ekimov ◽  
Andrey V. Naumov
Keyword(s):  
Continuous Wave ◽  
Incident Light ◽  
Theoretical Explanation ◽  
Dielectric Medium ◽  
Continuous Wave Laser ◽  
Enhanced Fluorescence ◽  
Colour Centres ◽  
Transient Regimes ◽  
Generalized System ◽  
Bright Luminescence

We propose a theoretical explanation of spontaneous transitions between dim and bright fluorescence intensity states observed experimentally in a microcrystal of diamond with germanium-vacancy colour centres driven by a continuous wave laser. We use a generalized system of optical Maxwell-Bloch equations derived for an emitter in an ensemble of motionless similar particles embedded in a dielectric medium, which is transparent for the incident light. A numerical analysis of transient regimes and several models of slow damping of the bright luminescence mode are reported.

BRIGHT LUMINESCENCE OF FIRE RETARDANT ALUMINUM HYDROXIDE-SILICA SPHERE COMPOSITE

2018 ◽  
Vol 25 (06) ◽  
pp. 1850113
Author(s):  
HA-SUNG KONG ◽  
BYOUNG-JU KIM ◽  
KWANG-SUN KANG
Keyword(s):  
Aluminum Hydroxide ◽  
Color Change ◽  
Fire Retardant ◽  
Excitation Wavelength ◽  
Silica Spheres ◽  
Fire Retardancy ◽  
Characteristic Absorption ◽  
Excess Amount ◽  
Mg Addition ◽  
Bright Luminescence

Bright luminescence was achieved with excess amount of aluminum hydroxide with silica spheres. Various amounts of aluminum hydroxide were attached to silica spheres to improve the performance of fire retardancy. Although silica spheres attached with 60[Formula: see text]wt.% of AlCl3 (AlOH-A) showed no color change and luminescent chromophores, silica spheres attached with 80[Formula: see text]wt.% of (AlOH-B) and 100% of (AlOH-C) of AlCl3 changed the color and produced luminescent chromophores. The solution colors became intense yellow and brown for AlOH-B and AlOH-C, respectively, after 15 days. The FTIR spectra showed the characteristic absorption peaks of Al–OH and Si–O–Al. The concentration dependent photoluminescence (PL) intensities were continuously increased until 242[Formula: see text]mg addition of the colored solution and then slightly decreased thereafter for both AlOH-B and AlOH-C. The PL peaks shifted toward red by increasing the excitation wavelength for both AlOH-B and AlOH-C. Large Stoke shifts, such as 73 and 68[Formula: see text]nm for AlOH-B and AlOH-C, respectively, were observed.

scholarly journals Eu(ii) luminescence in the perovskite host lattices KMgH3, NaMgH3 and mixed crystals LiBaxSr1−xH3

2014 ◽  
Vol 2 (24) ◽  
pp. 4799-4804 ◽  
Author(s):  
N. Kunkel ◽  
A. Meijerink ◽  
M. Springborg ◽  
H. Kohlmann
Keyword(s):  
Red Shift ◽  
Mixed Crystals ◽  
Emission Energy ◽  
Host Lattices ◽  
Bright Luminescence

Bright luminescence is observed for the perovskite KMgH3:Eu2+ and a wide red shift in the emission energies of Eu(ii) in NaMgH3. In LiBaxSr1−xH3:Eu2+ the emission energy depends on the value of x.

Synthesis of Mn2+ Doped CdS Nanocrystals Embedded in a Sol-Gel Silica Matrix: Characterization of the Luminescence Activator

1996 ◽  
Vol 452 ◽  
Author(s):  
G. Counio ◽  
S. Esnouf ◽  
T. Gacoin ◽  
P. Barboux ◽  
A. Hofstaetter ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Sol Gel ◽  
Silica Matrix ◽  
Silica Xerogels ◽  
Cds Nanocrystals ◽  
Bright Luminescence

AbstractMn2+-doped CdS nanocrystals (1.2 to 2.4 nm in diameter) embedded in organic-inorganic silica xerogels have been synthesized. Extensive studies (EXAFS, ESR and ENDOR) allow us to localize the ions responsible for the bright luminescence observed in such materials (quantum yield of 7%). The average number of Mn2+ per nanocrystal is in the 0.2–0.8 range, and the emission arises from an energy transfer from surface trapped carriers to Mn2+ ions.

Bright luminescence in lanthanide coordination polymers with tetrafluoroterephthalate as a bridging ligand

2015 ◽  
Vol 44 (13) ◽  
pp. 6249-6259 ◽  
Author(s):  
Miriam Sobieray ◽  
Jens Gode ◽  
Christiane Seidel ◽  
Marieke Poß ◽  
Claus Feldmann ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Visible Region ◽  
Green Emission ◽  
Quantum Yields ◽  
Lanthanide Coordination Polymers ◽  
Bridging Ligand ◽  
Bright Luminescence

Ten lanthanide coordination polymers with tetrafluoroterephthalate as the linker were synthesized. Europium and terbium compounds exhibit intense red and green emission in the visible region with quantum yields up to 67%.

scholarly journals New aspects in bis and tris(dipyrrinato)metal complexes: bright luminescence, self-assembled nanoarchitectures, and materials applications

2015 ◽  
Vol 3 (30) ◽  
pp. 15357-15371 ◽  
Author(s):  
Ryota Sakamoto ◽  
Toshiki Iwashima ◽  
Mizuho Tsuchiya ◽  
Ryojun Toyoda ◽  
Ryota Matsuoka ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Recent Progress ◽  
Self Assembled ◽  
Bright Luminescence

This review summarizes recent progress in bis and tris(dipyrrinato)metal complexes, focusing on luminescence intensification, supramolecules and nanostructures, and materials applications.

scholarly journals Cinnamal Sensing and Luminescence Color Tuning in a Series of Rare-Earth Metal−Organic Frameworks with Trans-1,4-cyclohexanedicarboxylate

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5145
Author(s):  
Pavel A. Demakov ◽  
Alena A. Vasileva ◽  
Sergey S. Volynkin ◽  
Alexey A. Ryadun ◽  
Denis G. Samsonenko ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Earth Metal ◽  
Quantum Yields ◽  
Accessible Volume ◽  
Emission Color ◽  
Metal Organic ◽  
Cyclohexanedicarboxylic Acid ◽  
Bright Luminescence ◽  
Luminescence Color ◽  
Tunable Emission

Three isostructural metal–organic frameworks ([Ln2(phen)2(NO3)2(chdc)2]·2DMF (Ln3+ = Y3+ for 1, Eu3+ for 2 or Tb3+ for 3; phen = 1,10-phenanthroline; H2chdc = trans-1,4-cyclohexanedicarboxylic acid) were synthesized and characterized. The compounds are based on a binuclear block {M2(phen)2(NO3)2(OOCR)4} assembled into a two-dime nsional square-grid network containing tetragonal channels with 26% total solvent-accessible volume. Yttrium (1)-, europium (2)- and terbium (3)-based structures emit in the blue, red and green regions, respectively, representing the basic colors of the standard RGB matrix. A doping of Eu3+ and/or Tb3+ centers into the Y3+-based phase led to mixed-metal compositions with tunable emission color and high quantum yields (QY) up to 84%. The bright luminescence of a suspension of microcrystalline 3 in DMF (QY = 78%) is effectively quenched by diluted cinnamaldehyde (cinnamal) solutions at millimolar concentrations, suggesting a convenient and analytically viable sensing method for this important chemical.

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