949910-86-5Relevant articles and documents
Calix[4]resorcinarene compound as well as preparation method and application thereof
-
Paragraph 0090; 0106-0109, (2019/04/02)
The invention discloses a Calix[4]resorcinarene compound as well as a preparation method and application thereof, and further provides a starlike light-emitting material taking Calix[4]resorcinarene (CRA) as a core and application of the light-emitting material in an organic light-emitting diode. The synthesis method for the compound is simple, the reaction conditions are mild, and the yield is high; and particularly, the core CRA (Calix[4]resorcinarene) has eight high-reactive sites, the eight high-reactive sites can be connected to eight functional groups in a hung mode, and the corresponding functional compound has relatively good film-forming property and solubility and relatively high thermal stability. The compound is applied to the organic light-emitting diode as a light-emitting layer material, so that the excellent device performance can be achieved.
Red-Emitting Thermally Activated Delayed Fluorescence Polymers with Poly(fluorene- co-3,3′-dimethyl diphenyl ether) as the Backbone
Yang, Yun,Zhao, Lei,Wang, Shumeng,Ding, Junqiao,Wang, Lixiang
, (2018/12/14)
A series of red-emitting thermally activated delayed fluorescence (TADF) polymers have been designed and synthesized based on poly(fluorene-co-3,3′-dimethyl diphenyl ether) (PFDMPE) as the backbone. Compared with polyfluorene (PF, 2.16 eV), the introduction of 3,3′-dimethyl diphenyl ether into the main chain of PFDMPE leads to the increased triplet energy of 2.58 eV, which is higher enough than the tethered red TADF guest (2.13 eV) to prevent the unwanted triplet energy back-transfer. Meanwhile, there is a good overlap between the absorption spectrum of the red guest and the photoluminescence (PL) spectrum of the polymeric host, ensuring the efficient energy transfer from host to guest. Consequently, the resultant polymers PFDMPE-R01 to PFDMPE-R10 in solid states show obvious red TADF properties with delayed fluorescence lifetimes of 126-191 μs and PL quantum yields of 0.18-0.55. Among them, PFDMPE-R05 obtains the best device performance, revealing a bright red electroluminescence peaked at 606 nm and a promising current efficiency of 10.3 cd/A (EQE = 5.6%). The results compete well with those of red phosphorescent polymers and indicate that PFDMPE other than PF is a suitable polymeric host for the construction of efficient red TADF polymers.
Highly efficient red electroluminescent polymers with dopant/host system and molecular dispersion feature: Polyfluorene as the host and 2,1,3-benzothiadiazole derivatives as the red dopant
Liu, Jun,Chen, Lei,Shao, Shiyang,Xie, Zhiyuan,Cheng, Yanxiang,Geng, Yanhou,Wang, Lixiang,Jing, Xiabin,Wang, Fosong
, p. 319 - 327 (2008/12/22)
By selecting polyfluorene as the polymer host, choosing 2,1,3-benzothiadiazole derivative moieties as the red dopant units and covalently attaching 0.3 mol% of the dopant units to the side chain of the polymer host, we developed a novel series of red electroluminescent polymers of dopant/host system with molecular dispersion feature. Their EL spectra exhibited predominant red emission from the dopant units because of the energy transfer and charge trapping from the polymer backbone to the dopant units. The emission wavelength of the polymers could be tuned by modifying the chemical structures of the dopant units. Single-layer devices (device configuration: ITO/PEDOT: PSS/polymer/Ca/Al) of these polymers emitted red light with a peak at 615 nm, a luminous efficiency of 5.04 cd A-1 and an external quantum efficiency of 3.47%, or emitted deep-red light with a peak at 650 nm, a luminous efficiency of 1.70 cd A-1 and an external quantum efficiency of 2.75%. Their high EL efficiencies were due to the energy transfer and charge trapping from the host to the dopant units as well as the molecular dispersion of the dopant units in the host. Increase of the dopant unit content led to increased turn-on voltages and decreased EL efficiencies of the resulting devices. The Royal Society of Chemistry.
