scholarly journals Liquid crystalline copper(i) complexes with bright room temperature phosphorescence

2020 ◽  
Vol 8 (19) ◽  
pp. 6552-6557 ◽  
Author(s):  
Raquel Giménez ◽  
Olga Crespo ◽  
Beatriz Diosdado ◽  
Anabel Elduque
Keyword(s):  
Liquid Crystal ◽  
Quantum Yield ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Crystal State ◽  
Yield Values

Phosphorescence in the liquid crystal state with one of the highest quantum yield values, 42%, at room temperature is reported.

scholarly journals Thermochemically Stable Liquid-Crystalline Gold(I) Complexes Showing Enhanced Room Temperature Phosphorescence

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 227 ◽  
Author(s):  
Yuki Kuroda ◽  
Shin-ya Nakamura ◽  
Katam Srinivas ◽  
Arruri Sathyanarayana ◽  
Ganesan Prabusankar ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Rational Design ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Decomposition Temperature ◽  
Ambient Conditions ◽  
Room Temperature Phosphorescence ◽  
Light Emitting ◽  
Phosphorescence Quantum Yield ◽  
Thermochemical Stability

Gold(I) complexes are some of the most attractive materials for generating aggregation-induced emission (AIE), enabling the realization of novel light-emitting applications such as chemo-sensors, bio-sensors, cell imaging, and organic light-emitting diodes (OLEDs). In this study, we propose a rational design of luminescent gold complexes to achieve both high thermochemical stability and intense room temperature phosphorescence, which are desirable features in practical luminescent applications. Here, a series of gold(I) complexes with ligands of N-heterocyclic carbene (NHC) derivatives and/or acetylide were synthesized. Detailed characterization revealed that the incorporation of NHC ligands could increase the molecular thermochemical stability, as the decomposition temperature was increased to ~300 °C. We demonstrate that incorporation of both NHC and acetylide ligands enables us to generate gold(I) complexes exhibiting both high thermochemical stability and high room-temperature phosphorescence quantum yield (>40%) under ambient conditions. Furthermore, we modified the length of alkoxy chains at ligands, and succeeded in synthesizing a liquid crystalline gold(I) complex while maintaining the relatively high thermochemical stability and quantum yield.

Ultralong lifetime room temperature phosphorescence and dual-band waveguide behavior of phosphoramidic acid oligomers

2020 ◽  
Vol 8 (22) ◽  
pp. 7330-7335 ◽  
Author(s):  
Zheng-Fei Liu ◽  
Xue Chen ◽  
Wei Jun Jin
Keyword(s):  
Quantum Yield ◽  
Optical Waveguide ◽  
Room Temperature ◽  
Dual Band ◽  
High Quantum Yield ◽  
Room Temperature Phosphorescence ◽  
Phosphorescence Lifetime ◽  
High Quantum ◽  
New System

The phosphoramidic acid oligomer as an organic non-conjugated RTP system is proposed. The new system not only has ultralong phosphorescence lifetime up to 777 ms and high quantum yield, but also displays dual-band optical waveguide behavior.

scholarly journals Enhanced phosphorescence properties of a Pt-porphyrin derivative fixed on the surface of nano-porous glass

2018 ◽  
Vol 17 (5) ◽  
pp. 622-627 ◽  
Author(s):  
Toshiko Mizokuro ◽  
Aizitiaili Abulikemu ◽  
Yusuke Sakagami ◽  
Tetsuro Jin ◽  
Kenji Kamada
Keyword(s):  
Quantum Yield ◽  
Porous Glass ◽  
Room Temperature ◽  
Nanometer Scale ◽  
Room Temperature Phosphorescence ◽  
Porphyrin Derivative

Room-temperature phosphorescence of a Pt-porphyrin derivative was enhanced in quantum yield and lifetime by fixing it on the surface of nanometer-scale pores of porous glass.

Isophthalate-Based Room Temperature Phosphorescence: From Small Molecule to Side-Chain Jacketed Liquid Crystalline Polymer

2019 ◽  
Vol 52 (6) ◽  
pp. 2495-2503 ◽  
Author(s):  
Yan-Fang Zhang ◽  
Yue-Chao Wang ◽  
Xiao-Song Yu ◽  
Yang Zhao ◽  
Xiang-Kui Ren ◽  
...  
Keyword(s):  
Small Molecule ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Crystalline Polymer ◽  
Side Chain ◽  
Room Temperature Phosphorescence

Room-Temperature Luminescence Properties of p-Aminobenzoic Acid and 4-Phenylphenol Adsorbed on α-Cyclodextrin/NaCl Mixtures

1988 ◽  
Vol 42 (4) ◽  
pp. 619-624 ◽  
Author(s):  
J. M. Bello ◽  
R. J. Hurtubise
Keyword(s):  
Quantum Yield ◽  
Solid Surface ◽  
Rate Constants ◽  
Room Temperature ◽  
Aminobenzoic Acid ◽  
Phosphorescence Lifetime ◽  
Phosphorescence Quantum Yield ◽  
Sample Preparation Procedure ◽  
Nonradiative Transitions ◽  
Yield Values

The solid-surface fluorescence and phosphorescence quantum yield values and phosphorescence lifetime values were obtained for p-aminobenzoic acid (PABA) and 4-phenylphenol adsorbed on α-cyclodextrin/NaCl mixtures. From the luminescence quantum yield and phosphorescence lifetime data, the triplet formation efficiency values, the phosphorescence rate constants, and the rate constants for radiationless transition from the triplet state were determined for PABA and 4-phenylphenol on α-cyclodextrin/NaCl mixtures. In addition, the percentages of radiative and nonradiative transitions were calculated for the two compounds. The various luminescence parameters obtained in this work provided important insights into the analyte/α-cyclodextrin substrate interactions responsible for the observed solid-surface room-temperature fluorescence (RTF) and phosphorescence (RTP). Furthermore, the RTF and RTP intensities of PABA and 4-phenylphenol were obtained from several α-cyclodextrin/NaCl mixtures. These data showed the importance of the initial wet chemistry in the sample preparation procedure.

Cholesteric liquid crystal glass platinum acetylides

2014 ◽  
Vol 1698 ◽  
Author(s):  
Thomas M. Cooper ◽  
Aaron R. Burke ◽  
Douglas M. Krein ◽  
Ronald F. Ziolo ◽  
Eduardo Arias ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Materials ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Cholesteric Liquid Crystal ◽  
Isotropic Phase ◽  
Crystal Glass ◽  
Cholesteric Phase ◽  
Long Time ◽  
Cholesteric Liquid Crystalline

ABSTRACTTo prepare cholesteric liquid crystalline nonlinear optical materials with ability to be vitrified on cooling and form long time stability cholesteric glasses at room temperature, a series of platinum acetylide complexes modified with cholesterol has been synthesized. The materials synthesized have the formula trans-Pt(PR3)(cholesterol (3 or 4)-ethynyl benzoate)(1-ethynyl-4-X-benzene), where R = Et, Bu or Oct and X = H, F, OCH3 and CN. A cholesteric liquid crystal phase was observed in the complexes R = Et, and X = F, OCH3 and CN but not in any of the other complexes. When X = CN, a cholesteric glass was observed at room temperature which remained stable up to 130 °C, then converted to a mixed crystalline/cholesteric phase and completely melted to an isotropic phase at 230 °C. When X = F or OCH3 the complexes were crystalline at room temperature with conversion to the cholesteric phase upon heating to 190 and 230 °C, respectively. In the series X = CN, OCH3 and F, the cholesteric pitch was determined to be 1.7, 3.4 and 9.0 µ, respectively.

Investigation of Polymer Stabilized Liquid Crystal Formation Using Fluorinated and Aliphatic Monoacrylates

2001 ◽  
Vol 709 ◽  
Author(s):  
Demetrius McCormick ◽  
C. Allan Guymon
Keyword(s):  
Liquid Crystal ◽  
Chemical Structure ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
Smectic Phase ◽  
Crystal Formation ◽  
Polymerization Mechanism ◽  
Smectic Liquid Crystal ◽  
Before And After ◽  
Polymer Stabilized

ABSTRACTThis study focuses on the photo-polymerization of a fluorinated monoacrylate monomer and aliphatic analog within a room temperature smectic liquid crystal (LC) in an effort to understand how factors such as LC order, monomer segregation, and monomer chemical structure affects the polymerization mechanism in polymer stabilized liquid crystalline systems (PSLC). Specifically, a fluorinated monoacrylate exhibits significantly enhanced polymerization rates when compared to an aliphatic monoacrylate. Moreover, this rate enhancement is particularly pronounced in the smectic phase of the LC, where the fluorinated monoacrylate displays a polymerization rate in the smectic phase that is over three times faster than the aliphatic monoacrylate in the smectic phase. Also the fluorinated monoacrylate exhibits enhanced segregation between the smectic layers of the LC both before and after polymerization, whereas the aliphatic monoacrylate phase separates during polymerization. The results of this study demonstrate how changes in the monomer chemical structure (i.e. fluorination) can significantly impact the polymerization mechanism and segregation in polymer stabilized systems. This study also offers the potential to further the understanding of tailoring these unique systems for display applications.

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