5525-40-6Relevant articles and documents
Strategy for achieving efficient electroluminescence with reduced efficiency roll-off: Enhancement of hot excitons spin mixing and restriction of internal conversion by twisted structure regulation using an anthracene derivative
Yu, Yue,Ma, Lin,Feng, Zhao,Liu, Boao,Zhou, Huixin,Qin, Hanlin,Li, Huan,Song, Jiangluqi,Zhou, Guijiang,Wu, Zhaoxin
, p. 5604 - 5614 (2019)
Phosphorescent and thermally activated delayed fluorescence (TADF) emitters have met a bottleneck due to the efficiency roll-off problem caused by the accumulation of the lowest triplet excited states with a relatively long lifetime. To achieve a high performance electroluminescence (EL) device with a simultaneously high radiative exciton ratio and a low efficiency roll-off in lighting applications at high luminance, we have demonstrated a novel strategy to construct an efficient hot exciton channel by effective spin mixing of the high-lying singlet and the triplet charge transfer (CT) excited states and restriction of the internal conversion (IC) from the high-lying triplet CT state to the lower triplet state. We selected luminous anthracene and electron-withdrawing triphenylphosphine oxide groups with a high triplet energy level to build four moderated D-A structure molecules which possess a high-lying CT hot exciton. Furthermore, the electronic coupling between the D and A unit can be precisely reduced by means of twisted structure regulation. In our series of novel synthesized materials, 9-[4-(diphenyl-phosphinoyl)-2-methyl-phenyl]-anthracene (An9-MePo) achieved optimization of the hot exciton radiation process and restriction of the IC. Both the maximum radiative exciton ratio of 74% and 72%, and the low efficiency roll-off of 10.6% and 15.9% at a luminance of 10000 cd m-2 were achieved in a practical lighting application by the An9-MePo based nondoped and doped EL devices, respectively. Our results provide a novel approach to the fabrication of an efficient hot exciton channel, proving the great potential of this EL molecule design strategy for practical lighting applications.
Superphenylphosphines: Nanographene-Based Ligands That Control Coordination Geometry and Drive Supramolecular Assembly
Smith, Jordan N.,Hook, James M.,Lucas, Nigel T.
, p. 1131 - 1141 (2018)
Tertiary phosphines remain widely utilized in synthesis, most notably as supporting ligands in metal complexes. A series of triarylphosphines bearing one to three hexa-peri-hexabenzocoronene (HBC) substituents has been prepared by an efficient divergent route. These "superphenylphosphines", P{HBC(t-Bu)5}nPh3-n (n = 1-3), form the palladium complexes PdCl2L2 and Pd2Cl4L2 where the isomer distribution in solution is dependent on the number of HBC substituents. The crystalline structures of five complexes all show intramolecular π-stacking between HBC-phosphines to form a supramolecular bidentate-like ligand that distorts the metal coordination geometry. When n = 2 or 3, the additional HBC substituents engage in intermolecular π-stacking to assemble the complexes into continuous ribbons or sheets. The phosphines adopt HBC's characteristics including strong optical absorption, green emission, and redox activity.
Aggregation-induced light emission material and preparation method thereof
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Paragraph 0016-0018, (2021/09/22)
The invention relates to the technical field of photoelectric display devices, in particular to an aggregation-induced light emission material and a preparation method thereof. The invention provides an aggregation-induced light emission material. The structural formula of the material is as shown in a formula (I). The preparation method of the aggregation-induced light emission material comprises the following step of: carrying out Suzuki coupling reaction on a compound as shown in a formula (II) and (4-bromophenyl) diphenyl phosphine oxide to prepare the compound as shown in the formula (I). With the aggregation-induced light emission material and the preparation method thereof of the invention adopted, the technical problems that an existing organic light-emitting material is poor in performance and easily generates an aggregation quenching light-emitting effect can be solved.
Asymmetrically substituted anthryl derivative as well as preparation and application thereof
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Paragraph 0060; 0067-0069, (2020/06/16)
The invention belongs to the technical field of organic electron transport materials, and discloses an asymmetrically substituted anthryl derivative as well as preparation and application thereof. Theasymmetrically substituted anthryl derivative is one of the following compounds (as shown in the specification). The invention also discloses a preparation method of the asymmetrically substituted anthryl derivative. An organic electron transport material comprises more than one of the asymmetric substituted anthryl derivatives. An n-type doped electron transport layer is obtained by carrying outn-type doping on the organic electron transport material. The organic electron transport material has the advantages of good solubility, high thermal decomposition temperature, high glass transitiontemperature and the like, and the electron transport layer formed through n-type doping is applied to electroluminescent devices, especially red phosphorescent devices, and has high stability.
