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.
Compound for organic luminescence, and application thereof
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, (2021/03/31)
The invention relates to a compound for organic luminescence, wherein the structure of the compound is shown as a formula (I), R1-R3 are independently selected from hydrogen, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group and a substituted or unsubstituted alkyl group respectively, L is selected from substituted or unsubstituted phenyl and substituted orunsubstituted heteroaryl, and Ar1 and Ar2 are respectively and independently selected from substituted or unsubstituted phenyl, naphthyl and anthryl. The compound for organic luminescence can be usedas an electron transport material, and has high stability, high charge transfer capability and high glass transition temperature.
Asymmetrically substituted anthryl derivative as well as preparation and application thereof
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, (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.