Effects of external heavy atoms and other factors on the room-temperature phosphorescence and fluorescence of tryptophan and tyrosine

1979 ◽  
Vol 51 (11) ◽  
pp. 1609-1612 ◽  
Author(s):  
Martin L. Meyers ◽  
Paul G. Seybold
Keyword(s):  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Heavy Atoms

Enhanced room-temperature phosphorescence of triphenylphosphine derivatives without metal and heavy atoms in their crystal phase

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 51683-51686 ◽  
Author(s):  
Pengchong Xue ◽  
Panpan Wang ◽  
Peng Chen ◽  
Jipeng Ding ◽  
Ran Lu
Keyword(s):  
Room Temperature ◽  
Crystal Phase ◽  
Room Temperature Phosphorescence ◽  
Heavy Atoms

Two simple triphenylphosphine derivatives have weak phosphorescence in solution, but the emissions were enhanced by 6.5 and 27 times, respectively, in crystals.

scholarly journals Clustering and Halogen Effects Enabled Red/Near-Infrared Room Temperature Phosphorescence from Aliphatic Cyclic Imides

2021 ◽  
Author(s):  
Tianwen Zhu ◽  
Tianjia Yang ◽  
Qiang Zhang ◽  
Wang Zhang Yuan
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Electron Delocalization ◽  
Intersystem Crossing ◽  
Room Temperature Phosphorescence ◽  
Heavy Atoms ◽  
Cyclic Imides ◽  
Rational Construction ◽  
Molecular Clustering ◽  
The Way

<a>Pure organics with room temperature phosphorescence (RTP) are urgently demanded in advanced optoelectronic and bioelectronic applications. However, currently reported phosphors are mostly aromatics and restricted to blue to orange colors. It remains an enormous challenge to achieve red and near-infrared (NIR) RTP, particularly for those from nonaromatics. Here we demonstrate a series of cyclic imides derived from succinimide, which can emit red (665, 690 nm) and even NIR (745 nm) RTP with outstanding efficiencies of up to 9.2%, despite their rather limited molecular conjugations. Such unique emission should be ascribed to the presence of the imide unit and heavy atoms, effective molecular clustering, and the electron delocalization of halogens, which not only greatly facilitate intersystem crossing, but also afford significantly extended through-space conjugation and rigidified conformations.</a> These results pave the way to the rational construction of red and NIR nonconventional luminophores through synergistic clustering and halogen effects.

scholarly journals Clustering and Halogen Effects Enabled Red/Near-Infrared Room Temperature Phosphorescence from Aliphatic Cyclic Imides

2021 ◽  
Author(s):  
Tianwen Zhu ◽  
Tianjia Yang ◽  
Qiang Zhang ◽  
Wang Zhang Yuan
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Electron Delocalization ◽  
Intersystem Crossing ◽  
Room Temperature Phosphorescence ◽  
Heavy Atoms ◽  
Cyclic Imides ◽  
Rational Construction ◽  
Molecular Clustering ◽  
The Way

<a>Pure organics with room temperature phosphorescence (RTP) are urgently demanded in advanced optoelectronic and bioelectronic applications. However, currently reported phosphors are mostly aromatics and restricted to blue to orange colors. It remains an enormous challenge to achieve red and near-infrared (NIR) RTP, particularly for those from nonaromatics. Here we demonstrate a series of cyclic imides derived from succinimide, which can emit red (665, 690 nm) and even NIR (745 nm) RTP with outstanding efficiencies of up to 9.2%, despite their rather limited molecular conjugations. Such unique emission should be ascribed to the presence of the imide unit and heavy atoms, effective molecular clustering, and the electron delocalization of halogens, which not only greatly facilitate intersystem crossing, but also afford significantly extended through-space conjugation and rigidified conformations.</a> These results pave the way to the rational construction of red and NIR nonconventional luminophores through synergistic clustering and halogen effects.

Heavy-atom-free amorphous materials with facile preparation and efficient room-temperature phosphorescence emission

2019 ◽  
Vol 55 (37) ◽  
pp. 5355-5358 ◽  
Author(s):  
Changxing Zhao ◽  
Yanhuan Jin ◽  
Jie Wang ◽  
Xiaoming Cao ◽  
Xiang Ma ◽  
...  
Keyword(s):  
Small Molecules ◽  
Amorphous Materials ◽  
Room Temperature ◽  
Heavy Atom ◽  
Room Temperature Phosphorescence ◽  
Heavy Atoms ◽  
Phosphorescence Emission ◽  
Facile Preparation

Amorphous pure organic room-temperature phosphorescent small molecules without heavy atoms were designed and facilely preparedviamodification of heavy-atom-free luminophores onto β-cyclodextrin.

scholarly journals Clustering and Halogen Effects Enabled Red/Near-Infrared Room Temperature Phosphorescence from Aliphatic Cyclic Imides

2021 ◽  
Author(s):  
Tianwen Zhu ◽  
Tianjia Yang ◽  
Qiang Zhang ◽  
Wang Zhang Yuan
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Electron Delocalization ◽  
Intersystem Crossing ◽  
Room Temperature Phosphorescence ◽  
Heavy Atoms ◽  
Cyclic Imides ◽  
Rational Construction ◽  
Molecular Clustering ◽  
The Way

<a>Pure organics with room temperature phosphorescence (RTP) are urgently demanded in advanced optoelectronic and bioelectronic applications. However, currently reported phosphors are mostly aromatics and restricted to blue to orange colors. It remains an enormous challenge to achieve red and near-infrared (NIR) RTP, particularly for those from nonaromatics. Here we demonstrate a series of cyclic imides derived from succinimide, which can emit red (665, 690 nm) and even NIR (745 nm) RTP with outstanding efficiencies of up to 9.2%, despite their rather limited molecular conjugations. Such unique emission should be ascribed to the presence of the imide unit and heavy atoms, effective molecular clustering, and the electron delocalization of halogens, which not only greatly facilitate intersystem crossing, but also afford significantly extended through-space conjugation and rigidified conformations.</a> These results pave the way to the rational construction of red and NIR nonconventional luminophores through synergistic clustering and halogen effects.

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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