scholarly journals Converting the molecular luminescence to ultralong room-temperature phosphorescence via excited states modulation on sulfone-containing heteroaromatics

2021 ◽  
Author(s):  
Zetong Ma ◽  
Zhiqiang Yang ◽  
Lan Mu ◽  
Lisong Deng ◽  
Liangjian Chen ◽  
...  
Keyword(s):  
Excited State ◽  
Molecular Orbital ◽  
Excited States ◽  
Room Temperature ◽  
Relaxation Processes ◽  
Room Temperature Phosphorescence ◽  
Molecular Luminescence

Manipulating molecular orbital properties of excited state, and then the relevant relaxation processes, can greatly alter the emission behaviors of luminophores. Herein we reported a vivid example of this respect...

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%.

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 Heavy-Atom-Free Room-Temperature Phosphorescent Organic Light-Emitting Diodes Enabled by Excited States Engineering

2020 ◽  
Author(s):  
Heather Higginbotham ◽  
Masato Okazaki ◽  
Piotr de Silva ◽  
Satoshi Minakata ◽  
Youhei Takeda ◽  
...  
Keyword(s):  
Excited States ◽  
Room Temperature ◽  
Light Emitting Diodes ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Room Temperature Phosphorescence ◽  
Host Matrix ◽  
Light Emitting ◽  
Organic Light

Room temperature phosphorescence materials offer great opportunities for applications in optoelectronics, due to their unique photophysical characteristics. However, purely organic emitters that can realize distinct electrophosphorescence are rarely exploited. Herein a new approach for designing heavy-atom-free organic room temperature phosphorescence emitters for organic light-emitting diodes is presented. The subtle tuning of the energy diagrams of singlet and triplet excited states by appropriate choice of host matrix allows tailored emission properties and switching of emission channels between thermally activated delayed fluorescence and room temperature phosphorescence. Moreover, an efficient and heavy-atom-free room temperature phosphorescence organic light-emitting diodes using the developed emitter is realized.

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>

scholarly journals Heavy-Atom-Free Room-Temperature Phosphorescent Organic Light-Emitting Diodes Enabled by Excited States Engineering

2020 ◽  
Author(s):  
Heather Higginbotham ◽  
Masato Okazaki ◽  
Piotr de Silva ◽  
Satoshi Minakata ◽  
Youhei Takeda ◽  
...  
Keyword(s):  
Excited States ◽  
Room Temperature ◽  
Light Emitting Diodes ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Room Temperature Phosphorescence ◽  
Host Matrix ◽  
Light Emitting ◽  
Organic Light

Room temperature phosphorescence materials offer great opportunities for applications in optoelectronics, due to their unique photophysical characteristics. However, purely organic emitters that can realize distinct electrophosphorescence are rarely exploited. Herein a new approach for designing heavy-atom-free organic room temperature phosphorescence emitters for organic light-emitting diodes is presented. The subtle tuning of the energy diagrams of singlet and triplet excited states by appropriate choice of host matrix allows tailored emission properties and switching of emission channels between thermally activated delayed fluorescence and room temperature phosphorescence. Moreover, an efficient and heavy-atom-free room temperature phosphorescence organic light-emitting diodes using the developed emitter is realized.

Sign in / Sign up

Export Citation Format

Share Document