triplet state) via a combined photochemical and transient absorption spectroscopic study. We found that the energy order between 1CT (charge transfer singlet state) and 3LE dictates the accessibility of 3LE/3CT for EnT, which can be effectively engineered by varying solvent polarity and D-A character to depopulate 3LE and facilitate EnT from the chemically more tunable 3CT state for photosensitization
三重态-三重态能量转移 (EnT) 是光催化中的基本活化途径。在这项工作中,我们报告了基于 EnT 的光催化反应中咔唑 - 氰基苯供体 - 受体(DA)荧光团的三重激发态的机械起源,并证明了控制 3LE(局部激发三重态)可及性的关键因素和通过结合光化学和瞬态吸收光谱研究的 3CT(电荷转移三重态)。我们发现 1CT(电荷转移单线态)和 3LE 之间的能量顺序决定了 EnT 3LE/3CT 的可及性,这可以通过改变溶剂极性和 DA 特征来有效地设计,以减少 3LE 的数量并促进 EnT 从化学更可调的 3CT光敏状态。遵循上述设计原则,鉴定了一种具有强 DA 特性和弱氧化还原电位的新型 DA 荧光团,该荧光团对 Ni(II) 催化的羧酸和芳基卤化物的交叉偶联表现出高效率,具有广泛的底物范围和高选择性。我们的结果不仅为 DA 荧光团的 EnT 机制提供了关键的基本见解,而且还确立了其在 EnT
Photocatalytic Reductive Radical‐Polar Crossover for a Base‐Free Corey–Seebach Reaction
作者:Karsten Donabauer、Kathiravan Murugesan、Urša Rozman、Stefano Crespi、Burkhard König
DOI:10.1002/chem.202003000
日期:2020.10.9
abstraction of a hydrogen atom followed by radical reduction. The generated nucleophilic intermediate is then capable of adding to carbonyl electrophiles. The obtained dithiane can be easily converted to the valuable α‐hydroxy carbonyl in a subsequent step. The proposed reaction mechanism is supported by emission quenching, radical–radical homocoupling and deuterium labeling studies as well as by calculated
Unveiling the effect of TADF as an energy relay dye in fluorescence resonance energy transfer based solid-state dye-sensitized solar cells
作者:Seungyoon Seok、Burragoni Sravanthi Goud、Su Jeong Gwak、Ramesh Kumar Chitumalla、Jongchul Lim、Wonjong Lee、Chau Thi Thanh Thuy、Srimai Vuppala、Joonkyung Jang、Ganesh Koyyada、Jae Hong Kim
DOI:10.1016/j.molstruc.2021.131576
日期:2022.2
Herein, the effect of thermally activated delayed fluorescence (TADF) material (4CzBN) as an energy donor (energyrelaydye) has been studied using TVP208 as an energy acceptor in fluorescence resonance energy transfer (FRET) based solid state dye sensitized solarcell (SS-DSSC). The performances of the TVP208 dye sensitized SS-DSSCs were compared by systematically changing the concentrations (0.0, 0.05
Compound, composition, organic electroluminescent element and electronic device
申请人:IDEMITSU KOSAN CO., LTD
公开号:US11271164B2
公开(公告)日:2022-03-08
A compound is represented by a formula (2) below. In the formula (2), at least one pair of a pair of X1 and X2, a pair of X2 and X3, a pair of X3 and X4, a pair of X4 and X5, a pair of X7 and X8, a pair of X8 and X9, a pair of X10 and X11, a pair of X11 and X12, a pair of X12 and X13, and a pair of X16 and X1 are carbon atoms to be bonded to a structure represented by as formula (2a) or (2b) below,