Waterborne polyurethanes prepared from benzophenone derivatives with delayed fluorescence and room-temperature phosphorescence

2018 ◽  
Vol 9 (11) ◽  
pp. 1303-1308 ◽  
Author(s):  
Tao Wang ◽  
Cao Zhou ◽  
Xingyuan Zhang ◽  
Dong Xu
Keyword(s):  
Charge Transfer ◽  
Room Temperature ◽  
Delayed Fluorescence ◽  
Triplet States ◽  
Room Temperature Phosphorescence ◽  
Waterborne Polyurethanes ◽  
Singlet And Triplet States

Charge-transfer states serve as a bridge between singlet and triplet states and polymerization can further promote communication between them.

Design of Thermally Activated Delayed Fluorescence Emitters for Organic Solid-State Microlasers

2021 ◽  
Author(s):  
Hongbing Fu ◽  
Shuai Li ◽  
Xue Jin ◽  
Zhenyi Yu ◽  
Xiaoxiao Xiao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Energy Gap ◽  
Delayed Fluorescence ◽  
Triplet States ◽  
Small Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Organic Solid ◽  
Singlet And Triplet States

Small energy gap between charge transfer (CT) singlet and triplet states enables thermally activated delayed fluorescence (TADF). Nevertheless, the small oscillator strength associated with CT states and their long exciton...

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%.

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