Achieving visible-light-excited organic room-temperature phosphorescence by manipulating p–π conjugation

2021 ◽  
Author(s):  
Qingyang Xu ◽  
Liangwei Ma ◽  
Siyu Sun ◽  
Xiang Ma
Keyword(s):  
Molecular Structure ◽  
Visible Light ◽  
Room Temperature ◽  
Heterocyclic Ring ◽  
Room Temperature Phosphorescence

Achieving visible-light-excited room-temperature phosphorescence by changing the sizes of the heterocyclic ring to manipulate p–π conjugation in the molecular structure.

Cyanophenylcarbazole isomers exhibiting different UV and visible light excitable room temperature phosphorescence

2019 ◽  
Vol 7 (31) ◽  
pp. 9671-9677 ◽  
Author(s):  
Yanhui Wang ◽  
Zhenzhen Zhang ◽  
Linxi Liu ◽  
Shou Yuan ◽  
Jie Ma ◽  
...  
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Light Excitation

Five cyanophenylcarbazole isomers have RTP activity under 365 nm UV and 400–460 nm visible light excitation but exhibit different RTP intensities and lifetimes.

Bromine‐Substituted Fluorene: Molecular Structure, Br–Br Interactions, Room‐Temperature Phosphorescence, and Tricolor Triboluminescence

2018 ◽  
Vol 130 (51) ◽  
pp. 17063-17068 ◽  
Author(s):  
Jiaqiang Wang ◽  
Can Wang ◽  
Yanbin Gong ◽  
Qiuyan Liao ◽  
Mengmeng Han ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Room Temperature ◽  
Room Temperature Phosphorescence

Bromine‐Substituted Fluorene: Molecular Structure, Br–Br Interactions, Room‐Temperature Phosphorescence, and Tricolor Triboluminescence

2018 ◽  
Vol 57 (51) ◽  
pp. 16821-16826 ◽  
Author(s):  
Jiaqiang Wang ◽  
Can Wang ◽  
Yanbin Gong ◽  
Qiuyan Liao ◽  
Mengmeng Han ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Room Temperature ◽  
Room Temperature Phosphorescence

scholarly journals Modulating Room-Temperature Phosphorescence-To-Phosphorescence Mechanochromism by Halogen Exchange

2022 ◽  
Vol 9 ◽  
Author(s):  
Yoshika Takewaki ◽  
Takuji Ogawa ◽  
Yosuke Tani
Keyword(s):  
Molecular Structure ◽  
Room Temperature ◽  
Molecular Conformation ◽  
Crystal Packing ◽  
Heavy Atom ◽  
Controlling Factors ◽  
Room Temperature Phosphorescence ◽  
Halogen Exchange ◽  
Stimulus Responsive ◽  
Amorphous States

Modulating the stimulus-responsiveness of a luminescent crystal is challenging owing to the complex interdependent nature of its controlling factors, such as molecular structure, molecular conformation, crystal packing, optical properties, and amorphization behavior. Herein, we demonstrate a halogen-exchange approach that disentangles this problem, thereby realizing the modulation of room-temperature phosphorescence-to-phosphorescence mechanochromism. Replacing the bromine atoms in a brominated thienyl diketone with chlorine atoms afforded isostructural crystals; i.e., molecules with different halogen atoms exhibited the same molecular conformation and crystal packing. Consequently, amorphization behavior toward mechanical stimulation was also the same, and the phosphorescence of amorphous states originated from the same conformer of each diketone. In contrast, the phosphorescence properties of each conformer were modulated differently, which is ascribable to heavy atom effects, resulting in the modulation of the mechanochromism. Thus, halogen exchange is a promising approach for modulating the stimulus-responsive photofunctions of crystals involving spin-forbidden processes.

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>

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