Ultrahigh Aggregation Induced Emission Efficiency in Multitwist-Based Luminogens under High Pressure

2021 ◽  
pp. 136-141
Author(s):  
You Li ◽  
Bifa Cao ◽  
Bo Li ◽  
Yuliang Liu ◽  
Ying Shi ◽  
...  
Keyword(s):  
High Pressure ◽  
Aggregation Induced Emission ◽  
Emission Efficiency

scholarly journals Advances in the application of high pressure in carbon dots

2019 ◽  
Vol 3 (12) ◽  
pp. 2617-2626 ◽  
Author(s):  
Ting Geng ◽  
Cui Liu ◽  
Guanjun Xiao ◽  
Siyu Lu ◽  
Bo Zou
Keyword(s):  
High Pressure ◽  
Carbon Dots ◽  
High Pressure Phase ◽  
Aggregation Induced Emission ◽  
Emission Enhancement ◽  
Pressure Phase

The great accomplishments were achieved under high pressure, including piezochromic luminescence, capturing high pressure phase, and pressure-triggered aggregation-induced emission enhancement.

scholarly journals High-Performance Non-doped Blue OLEDs based on Efficiently Triplet-Triplet Upconversion and Aggregation-induced Emission

2021 ◽  
Author(s):  
Pengbo Han ◽  
Chengwei Lin ◽  
Kaojin Wang ◽  
Yanping Qiu ◽  
Haozhong Wu ◽  
...  
Keyword(s):  
High Performance ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Aggregation Induced Emission ◽  
Singlet Exciton ◽  
Emission Efficiency ◽  
Calculated Energy Level ◽  
High Emission ◽  
Film State ◽  
Triplet Excitons

Triplet-triplet upconversion (TTU), where two low-energy triplet excitons are converted to one higher energy singlet exciton, is excellent approach to break through the theoretical limit of the pure fluorescent organic light-emitting diodes (OLEDs) by 5%. To data, however, the reported emitters with high emission efficiency and efficiently TTU in film state are rare. Herein, we design the blue aggregation-induced emission luminogens (AIEgens) and investigate their upconversion efficiency. TPA-An-mPhCz can not only achieve high emission efficiency in the film state, but also show high upconversion efficiency of close to 50% even though the calculated energy level of the triplet excitons (T<sub>2</sub>) is lower than 2T<sub>1</sub>. A possible upconversion mechanism is proposed according to the transient electroluminescence spectra and theoretical calculation. This strategy may provide a new platform for the construction of highly efficient non-doped blue OLEDs based on TTU and AIEgens.

Oxidation-enhanced emission: exploring novel AIEgens from thieno[3,2-b]thiophene S,S-dioxide

2017 ◽  
Vol 5 (4) ◽  
pp. 960-968 ◽  
Author(s):  
Bin Chen Bin Chen ◽  
Han Zhang ◽  
Wenwen Luo ◽  
Han Nie ◽  
Rongrong Hu ◽  
...  
Keyword(s):  
Solid State ◽  
Aggregation Induced Emission ◽  
High Solid ◽  
Emission Efficiency

A novel aggregation-induced emission (AIE) system with high solid-state emission efficiency is established by oxidizing thieno[3,2-b]thiophene to thieno[3,2-b]thiophene S,S-dioxide.

scholarly journals High-Performance Non-doped Blue OLEDs based on Efficiently Triplet-Triplet Upconversion and Aggregation-induced Emission

2021 ◽  
Author(s):  
Pengbo Han ◽  
Chengwei Lin ◽  
Kaojin Wang ◽  
Yanping Qiu ◽  
Haozhong Wu ◽  
...  
Keyword(s):  
High Performance ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Aggregation Induced Emission ◽  
Singlet Exciton ◽  
Emission Efficiency ◽  
Calculated Energy Level ◽  
High Emission ◽  
Film State ◽  
Triplet Excitons

Triplet-triplet upconversion (TTU), where two low-energy triplet excitons are converted to one higher energy singlet exciton, is excellent approach to break through the theoretical limit of the pure fluorescent organic light-emitting diodes (OLEDs) by 5%. To data, however, the reported emitters with high emission efficiency and efficiently TTU in film state are rare. Herein, we design the blue aggregation-induced emission luminogens (AIEgens) and investigate their upconversion efficiency. TPA-An-mPhCz can not only achieve high emission efficiency in the film state, but also show high upconversion efficiency of close to 50% even though the calculated energy level of the triplet excitons (T<sub>2</sub>) is lower than 2T<sub>1</sub>. A possible upconversion mechanism is proposed according to the transient electroluminescence spectra and theoretical calculation. This strategy may provide a new platform for the construction of highly efficient non-doped blue OLEDs based on TTU and AIEgens.

Blue-shifted aggregation-induced enhancement of a Sn(iv) fluoride complex: the role of fluorine in luminescence enhancement

2020 ◽  
Vol 56 (67) ◽  
pp. 9648-9650
Author(s):  
Wooseok Ki ◽  
Kathleen Ngo ◽  
Phalguni Ghosh ◽  
Boris Averkiev ◽  
Gordan T. Reeves ◽  
...  
Keyword(s):  
Luminescence Enhancement ◽  
Aggregation Induced Emission ◽  
Fluoride Complex ◽  
Emission Efficiency ◽  
Emission Enhancement

A fluorinated Sn(iv) complex not only significantly enhances the emission efficiency, but also exhibits blue-shifted aggregation-induced emission enhancement (AIEE) properties.

High-pressure freezing of cells in suspension for low-voltage scanning electron microscopy (LVSEM)

1991 ◽  
Vol 49 ◽  
pp. 64-65
Author(s):  
Marek Malecki ◽  
James Pawley ◽  
Hans Ris
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Low Voltage ◽  
Culture Media ◽  
Cell Structure ◽  
Freeze Substitution ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Culture Media ◽  
Voltage Scanning

The ultrastructure of cells suspended in physiological fluids or cell culture media can only be studied if the living processes are stopped while the cells remain in suspension. Attachment of living cells to carrier surfaces to facilitate further processing for electron microscopy produces a rapid reorganization of cell structure eradicating most traces of the structures present when the cells were in suspension. The structure of cells in suspension can be immobilized by either chemical fixation or, much faster, by rapid freezing (cryo-immobilization). The fixation speed is particularly important in studies of cell surface reorganization over time. High pressure freezing provides conditions where specimens up to 500μm thick can be frozen in milliseconds without ice crystal damage. This volume is sufficient for cells to remain in suspension until frozen. However, special procedures are needed to assure that the unattached cells are not lost during subsequent processing for LVSEM or HVEM using freeze-substitution or freeze drying. We recently developed such a procedure.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

Cryosectioning plant roots prepared by high-pressure freezing

1987 ◽  
Vol 45 ◽  
pp. 662-663
Author(s):  
R.E. Crang ◽  
M. Mueller ◽  
K. Zierold
Keyword(s):  
High Pressure ◽  
Cell Walls ◽  
Plant Tissues ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Vitreous State ◽  
Radial Depth ◽  
Irregular Topography ◽  
Considerable Depth ◽  
Conventional Freezing

Obtaining frozen-hydrated sections of plant tissues for electron microscopy and microanalysis has been considered difficult, if not impossible, due primarily to the considerable depth of effective freezing in the tissues which would be required. The greatest depth of vitreous freezing is generally considered to be only 15-20 μm in animal specimens. Plant cells are often much larger in diameter and, if several cells are required to be intact, ice crystal damage can be expected to be so severe as to prevent successful cryoultramicrotomy. The very nature of cell walls, intercellular air spaces, irregular topography, and large vacuoles often make it impractical to use immersion, metal-mirror, or jet freezing techniques for botanical material.However, it has been proposed that high-pressure freezing (HPF) may offer an alternative to the more conventional freezing techniques, inasmuch as non-cryoprotected specimens may be frozen in a vitreous, or near-vitreous state, to a radial depth of at least 0.5 mm.

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