Room-temperature phosphorescence lifetimes and intensities of p-aminobenzoic acid adsorbed on sodium acetate-sodium chloride mixtures

1985 ◽  
Vol 57 (7) ◽  
pp. 1227-1230 ◽  
Author(s):  
V. P. Senthilnathan ◽  
Robert J. Hurtubise
Keyword(s):  
Sodium Chloride ◽  
Sodium Acetate ◽  
Room Temperature ◽  
Aminobenzoic Acid ◽  
Room Temperature Phosphorescence

Room-temperature phosphorescence of compounds adsorbed on sodium acetate

1977 ◽  
Vol 49 (14) ◽  
pp. 2164-2169 ◽  
Author(s):  
R. M. A. Von Wandruszka ◽  
R. J. Hurtubise
Keyword(s):  
Sodium Acetate ◽  
Room Temperature ◽  
Room Temperature Phosphorescence

Effects of a Heavy-Atom Salt on the Solid-Matrix Luminescence Properties of the (±)-Trans-7,8-Dihydroxy-Anti-9,10-Epoxy-7,8,9,10-Tetrahydrobenzo[a]Pyrene-DNA Adducts and Tetrol I-1 Adsorbed on Several Solid Matrices

1996 ◽  
Vol 50 (4) ◽  
pp. 476-482 ◽  
Author(s):  
Yu Chu ◽  
Robert J. Hurtubise
Keyword(s):  
Dna Adducts ◽  
Sodium Acetate ◽  
Room Temperature ◽  
Limit Of Detection ◽  
Heavy Atom ◽  
Luminescence Properties ◽  
Solid Matrix ◽  
Room Temperature Phosphorescence ◽  
Solid Matrices

The effects of a heavy-atom salt on the room-temperature solid-matrix luminescence properties of the (±)- trans-7,8-dihydroxy- anti-9,10-epoxy-7,8,9,10-tetrahydrobenzo[ a]pyrene-DNA adducts [(±)- anti-BPDE-DNA adducts] and benzo[ a]pyrene- r-7, t-8,9, c-10-tetrahydrotetrol (tetrol I-1) on several solid matrices were investigated. TlNO3 was found to be very effective in enhancing the room-temperature phosphorescence of the (±)- anti-BPDE-DNA adducts and tetrol I-1. However, the room-temperature fluorescence signals were quenched from the (±)- anti-BPDE-DNA adducts and tetrol I-1 on the solid matrices with the heavy-atom salt. It was found that 1% α-cyclodextrin/TlNO3, 10% trehalose/TlNO3, and 30% TlNO3/sodium acetate (NaOAc) yielded very strong RTP signals from the (±)- anti-BPDE-DNA adducts. The greatest enhancement of the RTP intensities from the (±)- anti-BPDE-DNA adducts was achieved with 30% TlNO3/NaOAc. In addition, a very low limit of detection (0.14 fmole/mg) for tetrol I-1 was acquired with 30% TlNO3/NaOAc. With its tremendous enhancement of RTP signals from the adducts and tetrol I-1 and the sub-femtomole limit of detection obtained for tetrol I-1, 30% TlNO3/NaOAc is ideal for the characterization and analysis of DNA adducts and their tetrol products.

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>

scholarly journals Tipping the Balance with the Aid of Stoichiometry: Room Temperature Phosphorescence versus Fluorescence in Organic Cocrystals

2015 ◽  
Vol 15 (4) ◽  
pp. 2039-2045 ◽  
Author(s):  
Simone d’Agostino ◽  
Fabrizia Grepioni ◽  
Dario Braga ◽  
Barbara Ventura
Keyword(s):  
Room Temperature ◽  
Room Temperature Phosphorescence
Sign in / Sign up

Export Citation Format

Share Document