Breaking Kasha’s Rule as a Mechanism for Solution-Phase Room-Temperature Phosphorescence from High-Lying Triplet Excited State

2020 ◽  
Vol 11 (19) ◽  
pp. 8246-8251
Author(s):  
Changfu Feng ◽  
Shuai Li ◽  
Liyuan Fu ◽  
Xiaoxiao Xiao ◽  
Zhenzhen Xu ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Solution Phase ◽  
Triplet Excited State ◽  
Room Temperature Phosphorescence

scholarly journals Ultra long‐lived triplet excited state in water at room temperature: Insights on the molecular design of tridecafullerenes

2021 ◽  
Author(s):  
Javier Ramos-Soriano ◽  
Alfonso Pérez-Sánchez ◽  
Sergio Ramírez-Barroso ◽  
Beatriz M. Illescas ◽  
Khalid Azmani ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Molecular Design ◽  
Triplet Excited State

scholarly journals Regioisomeric Effect on the Excited-State Fate Leading to Room-Temperature Phosphorescence or Thermally Activated Delayed Fluorescence in a Dibenzophenazine-Cored Donor–Acceptor–Donor System

2021 ◽  
Author(s):  
Takumi Hosono ◽  
Nicolas Oliveira Decarli ◽  
Paola Zimmermann Crocomo ◽  
Tsuyoshi Goya ◽  
Leonardo Evaristo de Sousa ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Delayed Fluorescence ◽  
Quantum Yields ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
Emission Behavior

Exploring design principle for switching thermally activated dealyed fluorescecne (TADF) and room temperature phosphorescence (RTP) is a fundamentally imporant research in developing triplet-mediated photofunctional organic materials. Herein systematic studies on the regioisomeric and substituents effects in a twisted donor–acceptor–donor (D–A–D) scaffold (A = dibenzo[a,j]phenazine; D = dihydrophenazasiline) on the fate of the excited state have been performed. The study revealed that the regiosiomerism clearly affects the emission behavior of the D–A–D compounds. Distinct difference in TADF, dual TADF & RTP, and dual RTP were observed, depending on the host used. Furthermore, OLED organic light-emitting diodes (OLEDs) fabricated with the developed emitters achieved high external quantum yields for RTP-based OLEDS up to 7.4%.

scholarly journals Near-Infrared-Excitable Organic Ultralong Phosphorescence through Multiphoton Absorption

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Ye Tao ◽  
Lele Tang ◽  
Qi Wei ◽  
Jibiao Jin ◽  
Wenbo Hu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Emission Feature ◽  
Multiphoton Absorption ◽  
Triplet Excited State ◽  
Room Temperature Phosphorescence ◽  
Two Photon ◽  
Nir Light ◽  
Phosphorescence Quantum Yield ◽  
Novel Applications

Organic ultralong room-temperature phosphorescence (OURTP) with a long-lived triplet excited state up to several seconds has triggered widespread research interests, but most OURTP materials are excited by only ultraviolet (UV) or blue light owing to their unique stabilized triplet- and solid-state emission feature. Here, we demonstrate that near-infrared- (NIR-) excitable OURTP molecules can be rationally designed by implanting intra/intermolecular charge transfer (CT) characteristics into H-aggregation to stimulate the efficient nonlinear multiphoton absorption (MPA). The resultant upconverted MPA-OURTP show ultralong lifetimes over 0.42 s and a phosphorescence quantum yield of ~37% under both UV and NIR light irradiation. Empowered by the extraordinary MPA-OURTP, novel applications including two-photon bioimaging, visual laser power detection and excitation, and lifetime multiplexing encryption devices were successfully realized. These discoveries illustrate not only a delicate design map for the construction of NIR-excitable OURTP materials but also insightful guidance for exploring OURTP-based nonlinear optoelectronic properties and applications.

Elucidating the Excited State of Mechanoluminescence in Organic Luminogens with Room-Temperature Phosphorescence

2017 ◽  
Vol 129 (48) ◽  
pp. 15501-15505 ◽  
Author(s):  
Jie Yang ◽  
Xuming Gao ◽  
Zongliang Xie ◽  
Yanbin Gong ◽  
Manman Fang ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Room Temperature Phosphorescence

scholarly journals Ultra long‐lived triplet excited state in water at room temperature: Insights on the molecular design of tridecafullerenes

2021 ◽  
Author(s):  
Javier Ramos-Soriano ◽  
Alfonso Pérez-Sánchez ◽  
Sergio Ramírez-Barroso ◽  
Beatriz M. Illescas ◽  
Khalid Azmani ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Molecular Design ◽  
Triplet Excited State

scholarly journals Persistent Organic Room-Temperature Phosphorescence in Cyclohexane-Trans-1,2-Bisphthalimide Derivatives: The Dramatic Impact of Heterochiral vs. Homochiral Interactions

2020 ◽  
Author(s):  
Ludovic Favereau ◽  
Cassandre Quinton ◽  
Cyril Poriel ◽  
Thierry Roisnel ◽  
Denis Jacquemin ◽  
...  
Keyword(s):  
Excited States ◽  
Intermolecular Interactions ◽  
Room Temperature ◽  
Triplet Excited State ◽  
Room Temperature Phosphorescence ◽  
Significant Interest ◽  
New Strategy ◽  
Triplet Excited States ◽  
The Impact ◽  
Triplet Excitons

Persistent metal-free Room-Temperature Phosphorescence (RTP) materials attract significant interest owing to the production of long-lived triplet excited states. Although several organic designs show RTP, the impact of intermolecular interactions on the triplet excitons stabilization and migrations remains hardly understood because obtaining different ordered intermolecular interactions while conserving identical molecular electronic properties is very challenging. We propose here a new strategy to circumvent this problem by taking advantage of the distinct molecular packing that can be found between enantiomer and racemic forms of a chiral molecule. Structural, photophysical and chiroptical investigations of chiral cyclohexane bisphthalimide derivatives showed that heterochiral and homochiral dimer interactions play a crucial role on the triplet excited state stabilization, resulting in higher RTP efficiency for enantiopure systems than for racemic one. This study paves the way to the use of molecular chirality to rationalize supramolecular properties arising from subtle intermolecular interactions.<br>

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