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
ORGANIC COMPOUND, AND ORGANIC LIGHT EMITTING DIODE AND ORGANIC LIGHT EMITTING DISPLAY DEVICE INCLUDING THE SAME
申请人:LG DISPLAY CO., LTD.
公开号:US20210155566A1
公开(公告)日:2021-05-27
The present disclosure provides an organic compound of following formula and an organic light emitting diode and an OLED device including the organic compound.
BENZONITRILE DERIVATIVE AND MANUFACTURING METHOD THEREFOR, INK COMPOSITION, ORGANIC ELECTROLUMINESCENT ELEMENT MATERIAL, LIGHT-EMITTING MATERIAL, CHARGE TRANSPORT MATERIAL, LIGHT-EMITTING THIN FILM, AND ORGANIC ELECTROLUMINESCENT ELEMENT
申请人:Konica Minolta, Inc.
公开号:US20210340160A1
公开(公告)日:2021-11-04
This benzonitrile derivative has the structure represented by general formula (1). [In the formula, each of substituent groups D
1
-D
5
independently represents a carbazolyl group or an azacarbazolyl group, and at least one thereof represents an azacarbazolyl group. Each of D
1
-D
5
may independently further have a substituent group.]
An organic light-emitting device comprising: a first electrode; a second electrode facing the first electrode; and an emission layer between the first electrode and the second electrode, wherein the emission layer comprises a host and a thermally activated delayed fluorescence emitter, the host comprises a first material and a second material, the first material and the second material are different from each other, the second material has a dipole moment of about 5.5 debye or more, the second material does not comprise a group represented by *
=o
, and * indicates a binding site to a neighboring atom.