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.

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 Ultralong purely organic aqueous phosphorescence supramolecular polymer for targeted tumor cell imaging

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Wei-Lei Zhou ◽  
Yong Chen ◽  
Qilin Yu ◽  
Haoyang Zhang ◽  
Zhi-Xue Liu ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Quantum Yield ◽  
Tumor Targeting ◽  
Room Temperature ◽  
Cell Imaging ◽  
Linear Array ◽  
Water Soluble ◽  
Supramolecular Polymer ◽  
Room Temperature Phosphorescence ◽  
Multiple Hydrogen Bonds

Abstract Purely organic room-temperature phosphorescence has attracted attention for bioimaging but can be quenched in aqueous systems. Here we report a water-soluble ultralong organic room-temperature phosphorescent supramolecular polymer by combining cucurbit[n]uril (CB[7], CB[8]) and hyaluronic acid (HA) as a tumor-targeting ligand conjugated to a 4-(4-bromophenyl)pyridin-1-ium bromide (BrBP) phosphor. The result shows that CB[7] mediated pseudorotaxane polymer CB[7]/HA–BrBP changes from small spherical aggregates to a linear array, whereas complexation with CB[8] results in biaxial pseudorotaxane polymer CB[8]/HA–BrBP which transforms to relatively large aggregates. Owing to the more stable 1:2 inclusion complex between CB[8] and BrBP and the multiple hydrogen bonds, this supramolecular polymer has ultralong purely organic RTP lifetime in water up to 4.33 ms with a quantum yield of 7.58%. Benefiting from the targeting property of HA, this supramolecular polymer is successfully applied for cancer cell targeted phosphorescence imaging of mitochondria.

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.

Donor-Acceptor Based Solvent-free Organic Liquid Hybrids with Exciplex Emission and Room Temperature Phosphorescence

2022 ◽  
Author(s):  
Vivek Chandrakant Wakchaure ◽  
Sairam D. Veer ◽  
Aakash D. Nidhankar ◽  
Goudappagouda Patil ◽  
Rashmi Nayak ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Room Temperature ◽  
Organic Liquid ◽  
Solvent Free ◽  
Organic Liquids ◽  
High Quantum Yield ◽  
Room Temperature Phosphorescence ◽  
Recent Developments ◽  
Exciplex Emission ◽  
Donor Acceptor

Solvent-free organic liquids have been known for their excellent luminescent features. Hence, the recent developments in this area have marked them as potential emitters with high quantum yield and enhanced...

Enhanced phosphorescence of Pd(II) and Pt(II) complexes adsorbed onto Laponite for optical sensing of triplet molecular dioxygen in water

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sathish Chatnahalli Gangadharappa ◽  
Iván Maisuls ◽  
Matias Ezequiel Gutierrez Suburu ◽  
Cristian A. Strassert
Keyword(s):  
Quantum Yield ◽  
Molecular Species ◽  
Coordination Compounds ◽  
Room Temperature ◽  
Optical Sensing ◽  
Room Temperature Phosphorescence ◽  
Photoexcited State

Abstract Two isoleptic complexes involving Pd(II) and Pt(II) centres with a tetradentate luminophoric ligand were adsorbed onto Laponite (LAP), yielding H2O-dispersible nanohybrids with remarkable photoexcited state properties. The adsorption promoted rigidification of the coordination compounds and suppression of roto-vibrational deactivation pathways, thus enhancing the performance of the molecular species. Interestingly, room temperature phosphorescence was achieved in the case of the Pd(II)-containing nanohybrid along with a marked 3O2 sensitivity, whereas the photoluminescence of the Pt(II)-based material showed only a mild dependence on the presence of 3O2 while reaching up to 37% quantum yield.

DNA Inspirited Rational Construction of Nonconventional Luminophores with Efficient and Color-Tunable Afterglow

2020 ◽  
Author(s):  
Yunzhong Wang ◽  
Saixing Tang ◽  
Yating Wen ◽  
Shuyuan Zheng ◽  
Bing Yang ◽  
...  
Keyword(s):  
Rational Design ◽  
Room Temperature ◽  
Double Helix ◽  
Mechanical Grinding ◽  
Room Temperature Phosphorescence ◽  
Color Tunable ◽  
Potential Applications ◽  
Rational Construction ◽  
Double Helix Structure ◽  
Made In

<div>Persistent room-temperature phosphorescence (p-RTP) from pure organics is attractive </div><div>due to its fundamental importance and potential applications in molecular imaging, </div><div>sensing, encryption, anticounterfeiting, etc.1-4 Recently, efforts have been also made in </div><div>obtaining color-tunable p-RTP in aromatic phosphors5 and nonconjugated polymers6,7. </div><div>The origin of color-tunable p-RTP and the rational design of such luminogens, </div><div>particularly those with explicit structure and molecular packing, remain challenging. </div><div>Noteworthily, nonconventional luminophores without significant conjugations generally </div><div>possess excitation-dependent photoluminescence (PL) because of the coexistence of </div><div>diverse clustered chromophores6,8, which strongly implicates the possibility to achieve </div><div>color-tunable p-RTP from their molecular crystals assisted by effective intermolecular </div><div>interactions. Here, inspirited by the highly stable double-helix structure and multiple </div><div>hydrogen bonds in DNA, we reported a series of nonconventional luminophores based on </div><div>hydantoin (HA), which demonstrate excitation-dependent PL and color-tunable p-RTP </div><div>from sky-blue to yellowish-green, accompanying unprecedentedly high PL and p-RTP </div><div>efficiencies of up to 87.5% and 21.8%, respectively. Meanwhile, the p-RTP emissions are </div><div>resistant to vigorous mechanical grinding, with lifetimes of up to 1.74 s. Such robust, </div><div>color-tunable and highly efficient p-RTP render the luminophores promising for varying </div><div>applications. These findings provide mechanism insights into the origin of color-tunable </div><div>p-RTP, and surely advance the exploitation of efficient nonconventional luminophores.</div>

Clustering-Triggered Efficient Room Temperature Phosphorescence from Nonconventional Luminophores

2019 ◽  
Author(s):  
Shuyuan Zheng ◽  
Taiping Hu ◽  
Xin Bin ◽  
Yunzhong Wang ◽  
Yuanping Yi ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Efficiency ◽  
Spin Orbit Coupling ◽  
Design Rationale ◽  
Emission Mechanism ◽  
Room Temperature Phosphorescence ◽  
Electronic Interactions ◽  
Energy Gaps ◽  
Theoretical Results

Pure organic room temperature phosphorescence (RTP) and luminescence from nonconventional luminophores have gained increasing attention. However, it remains challenging to achieve efficient RTP from unorthodox luminophores, on account of the unsophisticated understanding of the emission mechanism. Here we propose a strategy to realize efficient RTP in nonconventional luminophores through incorporation of lone pairs together with clustering and effective electronic interactions. The former promotes spin-orbit coupling and boost the consequent intersystem crossing, whereas the latter narrows energy gaps and stabilizes the triplets, thus synergistically affording remarkable RTP. Experimental and theoretical results of urea and its derivatives verify the design rationale. Remarkably, RTP from thiourea solids with unprecedentedly high efficiency of up to 24.5% is obtained. Further control experiments testify the crucial role of through-space delocalization on the emission. These results would spur the future fabrication of nonconventional phosphors, and moreover should advance understanding of the underlying emission mechanism.<br>

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