Achieving high singlet-oxygen generation by applying the heavy-atom effect to thermally activated delayed fluorescent materials

2021 ◽  
Author(s):  
Ya-Fang Xiao ◽  
Jia-Xiong Chen ◽  
Wen-Cheng Chen ◽  
Xiuli Zheng ◽  
Chen Cao ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Heavy Atom ◽  
Synergetic Effect ◽  
Heavy Atom Effect ◽  
Oxygen Generation ◽  
Thermally Activated ◽  
Singlet Oxygen Generation ◽  
Fluorescent Materials ◽  
Atom Effect

Applying the heavy-atom effect to TADF photosensitizers achieves ultra-high 1O2 generation (ФΔ = 0.91) by the synergetic effect of small ΔEST and considerable SOC.

Modulation of singlet oxygen generation and amphiphilic properties of trihydroxylated monohalogenated porphyrins

2015 ◽  
Vol 19 (10) ◽  
pp. 1081-1087 ◽  
Author(s):  
Derya Topkaya ◽  
Philippe Arnoux ◽  
Fabienne Dumoulin
Keyword(s):  
Singlet Oxygen ◽  
Biomedical Applications ◽  
Heavy Atom ◽  
Cell Uptake ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Halogen Atoms ◽  
Porphyrin Core ◽  
Halogen Free ◽  
Atom Effect

Two of the properties important for photodynamic therapy applications are systematically investigated on a trihydroxylated monohalogenated porphyrin core. Singlet oxygen generation can be increased thanks to the heavy atom effect, frequently provided by the introduction of halogen atoms on the photosensitizer. We compare the effect of the presence of the four halogen atoms with the analogous halogen-free porphyrin. Cell uptake is crucial as well for successful photodynamic outcome and is directly related to the amphiphilicity of the molecule. The five derivatives bearing H, F, Cl, Br or I atoms are compared in this regard. The presence of iodine atom induces a sharp difference in singlet oxygen generation compared to all the other derivatives investigated, but increases its lipophilicity, still in the limits suitable for biomedical applications.

Organic nanostructures of thermally activated delayed fluorescent emitters with enhanced intersystem crossing as novel metal-free photosensitizers

2016 ◽  
Vol 52 (79) ◽  
pp. 11744-11747 ◽  
Author(s):  
Jinfeng Zhang ◽  
Wencheng Chen ◽  
Rui Chen ◽  
Xiao-Ke Liu ◽  
Yuan Xiong ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Intersystem Crossing ◽  
Oxygen Generation ◽  
Metal Free ◽  
Thermally Activated ◽  
Singlet Oxygen Generation ◽  
Organic Nanostructures

We applied organic nanostructures based on TADF emitters for singlet oxygen generation.

scholarly journals Heavy Atom Free Singlet Oxygen Generation: Doubly Substituted Configurations Dominate S1 States of Bis-BODIPYs

2012 ◽  
Vol 77 (10) ◽  
pp. 4516-4527 ◽  
Author(s):  
Selin Duman ◽  
Yusuf Cakmak ◽  
Safacan Kolemen ◽  
Engin U. Akkaya ◽  
Yavuz Dede
Keyword(s):  
Singlet Oxygen ◽  
Heavy Atom ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation

A “Multi‐Heavy‐Atom” Approach toward Biphotonic Photosensitizers with Improved Singlet‐Oxygen Generation Properties

2019 ◽  
Vol 25 (38) ◽  
pp. 9026-9034 ◽  
Author(s):  
Margaux Galland ◽  
Tangui Le Bahers ◽  
Akos Banyasz ◽  
Noëlle Lascoux ◽  
Alain Duperray ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Heavy Atom ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation

scholarly journals Heavy-Atom Effect Promotes Multi-Resonance Thermally Activated Delayed Fluorescence

2021 ◽  
Author(s):  
Tao Hua ◽  
Lisi Zhan ◽  
Nengquan Li ◽  
Zhongyan Huang ◽  
Xiaosong Cao ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Heavy Atom Effect ◽  
Thermally Activated ◽  
Organic Light ◽  
Atom Effect

As one type of latest emitters with simultaneous high efficiency and color-purity, the development of multi-resonance thermally activated delayed fluorescence (MR-TADF) materials represents an important advancement for organic light-emitting diodes (OLEDs). We herein present a new strategy to improve the performance of MR-TADF emitters by fusing sulfur element into the B-N based framework, aiming to utilize the non-metal heavy-atom effect in accelerating the reverse intersystem crossing (RISC) process of the emitter. Two compounds, namely 2PTZBN and 2PXZBN, were developed in this work through rigidifying the DABNA-1 skeleton by sulfur or oxygen atoms. The theoretical calculations and photoluminescence studies revealed that the sulfur-incorporated 2PTZBN enabled considerable rate constant of RISC (<i>k</i><sub>RISC</sub>) up to 2.8 × 10<sup>5</sup> s<sup>-1</sup> in toluene due to larger spin-orbital coupling (SOC) values and smaller singlet-triplet energy splitting (Δ<i>E</i><sub>ST</sub>) compared with 2PXZBN. Consequently, organic light-emitting diodes based on 2PTZBN exhibited highly efficient green emission with maximum external quantum efficiency (EQE) of 25.5%.

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