The Optical Stability of Beryllium Complexes

1954 ◽  
Vol 76 (21) ◽  
pp. 5352-5353 ◽  
Author(s):  
Daryle H. Busch ◽  
John C. Bailar
Keyword(s):  
Optical Stability ◽  
Beryllium Complexes

Effect of Techniques for Polishing Molybdenum Mirrors on their Optical Stability under Cleaning D2–N2 Plasma

2020 ◽  
Vol 14 (5) ◽  
pp. 1003-1015
Author(s):  
A. E. Gorodetsky ◽  
A. V. Markin ◽  
V. L. Bukhovets ◽  
V. L. Voytitsky ◽  
T. V. Rybkina ◽  
...  
Keyword(s):  
Optical Stability ◽  
N2 Plasma

scholarly journals Encapsulated Passivation of Perovskite Quantum Dot (CsPbBr3) Using a Hot-Melt Adhesive (EVA-TPR) for Enhanced Optical Stability and Efficiency

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 419
Author(s):  
Saradh Prasad ◽  
Mamduh J. Aljaafreh ◽  
Mohamad S. AlSalhi ◽  
Abeer Alshammari
Keyword(s):  
Quantum Dots ◽  
Band Gap ◽  
Surface Defects ◽  
Optoelectronic Devices ◽  
Ethylene Vinyl Acetate ◽  
Light Emitting ◽  
Optical Stability ◽  
Perovskite Quantum Dots ◽  
Polymer Light Emitting Diodes ◽  
Hot Melt

The notable photophysical characteristics of perovskite quantum dots (PQDs) (CsPbBr3) are suitable for optoelectronic devices. However, the performance of PQDs is unstable because of their surface defects. One way to address the instability is to passivate PQDs using different organic (polymers, oligomers, and dendrimers) or inorganic (ZnS, PbS) materials. In this study, we performed steady-state spectroscopic investigations to measure the photoluminescence (PL), absorption (A), transmission (T), and reflectance (R) of perovskite quantum dots (CsPbBr3) and ethylene vinyl acetate/terpene phenol (1%) (EVA-TPR (1%), or EVA) copolymer/perovskite composites in thin films with a thickness of 352 ± 5 nm. EVA is highly transparent because of its large band gap; furthermore, it is inexpensive and easy to process. However, the compatibility between PQDs and EVA should be established; therefore, a series of analyses was performed to compute parameters, such as the band gap, the coefficients of absorbance and extinction, the index of refractivity, and the dielectric constant (real and imaginary parts), from the data obtained from the above investigation. Finally, the optical conductivities of the films were studied. All these analyses showed that the EVA/PQDs were more efficient and stable both physically and optically. Hence, EVA/PQDs could become copolymer/perovskite active materials suitable for optoelectronic devices, such as solar cells and perovskite/polymer light-emitting diodes (PPLEDs).

Design, Synthesis and Use of Phthalocyanines as a New Class of Visible-Light Photoinitiators for Free-Radical and Cationic Polymerizations

2021 ◽  
Author(s):  
Davy-Louis Versace ◽  
Louise Breloy ◽  
Yusuf Yagci ◽  
Ismail Yilmaz ◽  
Ozgur Yavuz
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Design Synthesis ◽  
New Class ◽  
Optical Stability ◽  
Cationic Polymerizations

Phthalocyanines (Pcs) are interesting molecules offering a fascinating chemistry world which received tremendous interest in the last decade. Their certain features such as high thermal, chemical, and optical stability as...

Nonlinear Optical Stability of Polyphenylsulfone (PPSU)‐Containing Anthraquinones with High Transmittance

2021 ◽  
pp. 2100112
Author(s):  
Zengduo Cui ◽  
Jiale Ding ◽  
Xuanbo Zhu ◽  
Bolong Li ◽  
Haibo Zhang ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Optical Stability

Schiff base equilibria. II. Beryllium complexes of N-n-butylsalicylideneimine and the hydrolysis of the Be2+ ion

1965 ◽  
Vol 18 (5) ◽  
pp. 651 ◽  
Author(s):  
RW Green ◽  
PW Alexander
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Complex Formation ◽  
Distribution Coefficient ◽  
Dilute Aqueous Solution ◽  
The Stability ◽  
Ph Range ◽  
Hydrolysis Of ◽  
Beryllium Complexes ◽  
Equilibria In Aqueous Solution

The Schiff base, N-n-butylsalicylideneimine, extracts more than 99.8% beryllium into toluene from dilute aqueous solution. The distribution of beryllium has been studied in the pH range 5-13 and is discussed in terms of the several complex equilibria in aqueous solution. The stability constants of the complexes formed between beryllium and the Schiff base are log β1 11.1 and log β2 20.4, and the distribution coefficient of the bis complex is 550. Over most of the pH range, hydrolysis of the Be2+ ion competes with complex formation and provides a means of measuring the hydrolysis constants. They are for the reactions: Be(H2O)42+ ↔ 2H+ + Be(H2O)2(OH)2, log*β2 - 13.65; Be(H2O)42+ ↔ 3H+ + Be(H2O)(OH)3-, log*β3 -24.11.

An optically stable and tunable quantum dot nanocrystal-embedded cholesteric liquid crystal composite laser

2014 ◽  
Vol 2 (22) ◽  
pp. 4388-4394 ◽  
Author(s):  
Lin-Jer Chen ◽  
Jia-De Lin ◽  
Chia-Rong Lee
Keyword(s):  
Liquid Crystal ◽  
Quantum Dot ◽  
Cholesteric Liquid Crystal ◽  
Azobenzene Moiety ◽  
Optical Stability ◽  
Composite Laser ◽  
Crystal Composite

This work demonstrates the first quantum-dot-embedded cholesteric liquid crystal composite laser with an added chiral-azobenzene moiety which possesses optical stability and reversible tunability.

Optical Stability of Axially Chiral Push-Pull-Substituted Buta-1,3-dienes: Effect of a Single Methyl Group on the C60 Surface

2010 ◽  
Vol 49 (20) ◽  
pp. 3532-3535 ◽  
Author(s):  
Michio Yamada ◽  
Pablo Rivera-Fuentes ◽  
W. Bernd Schweizer ◽  
François Diederich
Keyword(s):  
Methyl Group ◽  
Axially Chiral ◽  
Optical Stability

Optical stability of thick‐shell CdSe@ZnS/ZnS quantum dots dissolved in n‐octane in wide range of mass concentration: photoluminescence decay study

2021 ◽  
Author(s):  
Adrian Adamski ◽  
Grzegorz Zatryb ◽  
Maciej Chrzanowski ◽  
Anna Lesiak ◽  
Artur Podhorodecki
Keyword(s):  
Quantum Dots ◽  
Mass Concentration ◽  
Thick Shell ◽  
Decay Study ◽  
Photoluminescence Decay ◽  
Wide Range ◽  
Optical Stability

scholarly journals Perylene Diimide-Based Fluorescent and Colorimetric Sensors for Environmental Detection

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 917 ◽  
Author(s):  
Shuai Chen ◽  
Zexu Xue ◽  
Nan Gao ◽  
Xiaomei Yang ◽  
Ling Zang
Keyword(s):  
Optical Sensors ◽  
Molecular Design ◽  
Environmental Pollutants ◽  
Comprehensive Overview ◽  
Strong Electron ◽  
Environmental Detection ◽  
Optical Stability ◽  
Sensitivity And Selectivity ◽  
Benzene Homologues ◽  
Multi Mode

Perylene tetracarboxylic diimide (PDI) and its derivatives exhibit excellent thermal, chemical and optical stability, strong electron affinity, strong visible-light absorption and unique fluorescence on/off features. The combination of these features makes PDIs ideal molecular frameworks for development in a broad range of sensors for detecting environmental pollutants such as heavy metal ions (e.g., Cu2+, Cd2+, Hg2+, Pd2+, etc.), inorganic anions (e.g., F−, ClO4−, PO4−, etc.), as well as poisonous organic compounds such as nitriles, amines, nitroaromatics, benzene homologues, etc. In this review, we provide a comprehensive overview of the recent advance in research and development of PDI-based fluorescent sensors, as well as related colorimetric and multi-mode sensor systems, for environmental detection in aqueous, organic or mixed solutions. The molecular design of PDIs and structural optimization of the sensor system (regarding both sensitivity and selectivity) in response to varying analytes are discussed in detail. At the end, a perspective summary is provided covering both the key challenges and potential solutions for the future development of PDI-based optical sensors.

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