In 2018,Li, Shu-Wei; Yu, Cheng-Hung; Ko, Chang-Lun; Chatterjee, Tanmay; Hung, Wen-Yi; Wong, Ken-Tsung published 《Cyanopyrimidine-Carbazole Hybrid Host Materials for High-Efficiency and Low-Efficiency Roll-Off TADF OLEDs》.ACS Applied Materials & Interfaces published the findings.Application of 3764-01-0 The information in the text is summarized as follows:
Two isomeric host materials (Sy and Asy) comprising carbazole (donor) and CN-substituted pyrimidine (acceptor) were synthesized, characterized, and utilized as host materials for green and blue thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs). Both mols. have high triplet energy and small energy difference between singlet and triplet states, leading to feasible TADF. The different linking topologies of carbazole and CN groups on the pyrimidine core provide distinct photophys. properties and mol. packing manners, which further influence the efficiency as they served as hosts in TADF OLEDs. As compared to Asy-based cases, the Sy-hosted TADF OLED device gave higher maximum external quantum efficiencies (EQE) of 24.0% (vs 22.5%) for green (4CzIPN as a dopant) and 20.4% (vs 15.0%) for blue (2CzTPN as a dopant) and low efficiency roll-off. The high horizontal dipole ratio (Θ ≈ 88%) for both emitters dispersed in Sy and Asy hosts accounts for the high device efficiency. A clear mol. structure-phys. property-device performance relationship has been established to highlight the importance of sym. structure in TADF host material design. After reading the article, we found that the author used 2,4,6-Trichloropyrimidine(cas: 3764-01-0Application of 3764-01-0)
2,4,6-Trichloropyrimidine(cas: 3764-01-0) is a member of organic chlorides. Almost all organochlorine compounds are synthesized. It is widely used as intermediates, solvents and pesticides of chemical synthetic products.Application of 3764-01-0
Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia