An ultralong room-temperature phosphorescent material based on the combination of small singlet–triplet splitting energy and H-aggregation

2020 ◽  
Vol 56 (31) ◽  
pp. 4296-4299
Author(s):  
Liang Zhang ◽  
Meng Li ◽  
Qing-Yu Gao ◽  
Chuan-Feng Chen
Keyword(s):  
Room Temperature ◽  
Triplet Splitting ◽  
Splitting Energy ◽  
Phosphorescent Material

Compound AI-N-Cz exhibited ultralong RTP with a lifetime of 775 ms due to the combination of small ΔEST and H-aggregation.

Invoking ultralong room temperature phosphorescence of purely organic compounds through H-aggregation engineering

2019 ◽  
Vol 6 (6) ◽  
pp. 1259-1264 ◽  
Author(s):  
Jie Yuan ◽  
Shuang Wang ◽  
Yu Ji ◽  
Runfeng Chen ◽  
Qi Zhu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Organic Compounds ◽  
Room Temperature ◽  
Reversed Phase ◽  
Room Temperature Phosphorescence ◽  
Dark State ◽  
Thermally Activated ◽  
Splitting Energy ◽  
Allowed State

Splitting energy (Δε)-controlled thermally activated reversed phase transformation from the low-lying dark state to the high-lying transition-allowed state of H-aggregation plays a key role in the organic ultralong room-temperature phosphorescence.

A Bipolar and Small Singlet-Triplet Splitting Energy Host with Triplet Energy Lower Than a Blue Phosphor for Phosphorescent OLEDs in Panchromatic Range

2016 ◽  
Vol 34 (8) ◽  
pp. 763-770 ◽  
Author(s):  
Chuanjun Wang ◽  
Gaowen Liu ◽  
Shaojie Liu ◽  
Xunlu Zhang ◽  
Changjin Ou ◽  
...  
Keyword(s):  
Triplet Energy ◽  
Blue Phosphor ◽  
Triplet Splitting ◽  
Splitting Energy

scholarly journals Efficient full-colour organic light-emitting diodes based on donor–acceptor electroluminescent materials with a reduced singlet–triplet splitting energy gap

RSC Advances ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 2948-2966 ◽  
Author(s):  
Jayaraman Jayabharathi ◽  
Ramaiyan Ramya ◽  
Venugopal Thanikachalam ◽  
Palanivel Jeeva ◽  
Elayaperumal Sarojpurani
Keyword(s):  
Light Emitting Diodes ◽  
Energy Gap ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Triplet Splitting ◽  
Donor Acceptor ◽  
Splitting Energy ◽  
Cie Coordinates

The Cz-DEPVI device showed high efficiencies of L: 13955 cd m−2, ηex: 4.90%, ηc: 6.0 cd A−1, ηp: 5.4 lm W−1 and CIE coordinates of (0.15, 0.06) at 2.8 V.

Visible Light-Emitting Hydrogenated Nanocrystalline Silicon-on-Insulator Films: Formation and Properties

2011 ◽  
Vol 178-179 ◽  
pp. 453-458
Author(s):  
Ida E. Tyschenko ◽  
Vladimir A. Volodin
Keyword(s):  
Room Temperature ◽  
Nanocrystalline Silicon ◽  
Silicon On Insulator ◽  
Raman Shift ◽  
High Dose ◽  
Nanocrystalline Phase ◽  
Light Emitting ◽  
Si Nanocrystals ◽  
Phonon Peak ◽  
Splitting Energy

Hydrogenated Si nanocrystals were performed by high-dose (51017 cm-2) low-energy (24 keV) H+ ion implantation of silicon-on-insulator (SOI) layers. The formation of the nanocrystalline phase was observed in the as-implanted samples and in those annealed at the temperature of 200-400o C. Both the Raman shift and the broadening of the phonon peak corresponded to Si nanocrystals with the diameters ranging from ~2 to ~3 nm. The room-temperature photoluminescence (PL) peaked at 1.58 - 1.64 eV was observed at room temperature. The PL peak energy corresponded to the energy of quantum confined exciton in the Si nanocrystals with the diameters mentioned above. The PL intensity had the bell-shaped dependence on the measurement temperature and had its maximum near 150 K. The estimated thermal activation energy of the PL was about 12.1 meV and was in good accordance with the singlet-triplet splitting energy of the exciton states.

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Hepatocyte Alterations in Guinea Pigs FED Polychlorinated Biphenyls (PCBs), Dibenzodioxins (PCDD), AND DIBENZOFURANS (PCDF)

1982 ◽  
Vol 40 ◽  
pp. 56-57
Author(s):  
J. N. Turner ◽  
D. N. Collins
Keyword(s):  
Guinea Pigs ◽  
Room Temperature ◽  
Dose Group ◽  
Methyl Cellulose ◽  
Uranyl Acetate ◽  
Target Organ ◽  
Office Building ◽  
Lead Citrate ◽  
Control Groups ◽  
Cooling Fluid

A fire involving an electric service transformer and its cooling fluid, a mixture of PCBs and chlorinated benzenes, contaminated an office building with a fine soot. Chemical analysis showed PCDDs and PCDFs including the highly toxic tetra isomers. Guinea pigs were chosen as an experimental animal to test the soot's toxicity because of their sensitivity to these compounds, and the liver was examined because it is a target organ. The soot was suspended in 0.75% methyl cellulose and administered in a single dose by gavage at levels of 1,10,100, and 500mgm soot/kgm body weight. Each dose group was composed of 6 males and 6 females. Control groups included 12 (6 male, 6 female) animals fed activated carbon in methyl cellulose, 6 males fed methyl cellulose, and 16 males and 10 females untreated. The guinea pigs were sacrificed at 42 days by suffocation in CO2. Liver samples were immediately immersed and minced in 2% gluteraldehyde in cacadylate buffer at pH 7.4 and 4°C. After overnight fixation, samples were postfixed in 1% OsO4 in cacodylate for 1 hr at room temperature, embedded in epon, sectioned and stained with uranyl acetate and lead citrate.

Domain Formation in Synthetic Quartz

1971 ◽  
Vol 29 ◽  
pp. 156-157
Author(s):  
Joseph J. Comer
Keyword(s):  
Electron Beam ◽  
Room Temperature ◽  
Domain Formation ◽  
Synthetic Quartz ◽  
Transmission Electron ◽  
Black Spots ◽  
Diffraction Mode ◽  
Domain Boundaries ◽  
Kikuchi Lines ◽  
Straight Lines

Domains visible by transmission electron microscopy, believed to be Dauphiné inversion twins, were found in some specimens of synthetic quartz heated to 680°C and cooled to room temperature. With the electron beam close to parallel to the [0001] direction the domain boundaries appeared as straight lines normal to <100> and <410> or <510> directions. In the selected area diffraction mode, a shift of the Kikuchi lines was observed when the electron beam was made to traverse the specimen across a boundary. This shift indicates a change in orientation which accounts for the visibility of the domain by diffraction contrast when the specimen is tilted. Upon exposure to a 100 KV electron beam with a flux of 5x 1018 electrons/cm2sec the boundaries are rapidly decorated by radiation damage centers appearing as black spots. Similar crystallographio boundaries were sometimes found in unannealed (0001) quartz damaged by electrons.

A Liquid Nitrogen Cooled Stage for STEM

1974 ◽  
Vol 32 ◽  
pp. 444-445
Author(s):  
Louis T. Germinario
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Liquid Nitrogen ◽  
Room Temperature ◽  
Objective Lens ◽  
Thermal Drift ◽  
Specimen Holder ◽  
Resolution Capability ◽  
Focal Position

A liquid nitrogen stage has been developed for the JEOL JEM-100B electron microscope equipped with a scanning attachment. The design is a modification of the standard JEM-100B SEM specimen holder with specimen cooling to any temperatures In the range ~ 55°K to room temperature. Since the specimen plane is maintained at the ‘high resolution’ focal position of the objective lens and ‘bumping’ and thermal drift la minimized by supercooling the liquid nitrogen, the high resolution capability of the microscope is maintained (Fig.4).

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