In 2022,Chen, Chia-Hsun; Lin, Shih-Chun; Lin, Bo-Yen; Li, Che-Yu; Kong, Yu-Cheng; Chen, Yi-Sheng; Fang, Shao-Cheng; Chiu, Ching-Huang; Lee, Jiun-Haw; Wong, Ken-Tsung; Lin, Chi-Feng; Hung, Wen-Yi; Chiu, Tien-Lung published an article in Chemical Engineering Journal (Amsterdam, Netherlands). The title of the article was 《New bipolar host materials for high power efficiency green thermally activated delayed fluorescence OLEDs》.SDS of cas: 3764-01-0 The author mentioned the following in the article:
Four bipolar mols., namely I, II, III, and IV, with carbazole (Cz) donor and a benzonitrile-substituted pyrimidine (Pym) or triazine (Trz) acceptor core were synthesized and characterized. The electron deficiency of heteroaryl cores together with the substitution pattern of benzonitrile were employed to tune the energy levels as well as the thermally activated delayed fluorescence (TADF) characteristics. The four mols. exhibited TADF behavior with inferior photoluminescent quantum yields (PLQYs) that limit their applications as emitters. These bipolar mols. were employed as TADF host materials for the benchmark TADF emitter 4CzIPN to achieve high-performing green TADF organic light-emitting diodes (OLEDs). Among the mols., I-hosted TADF-OLEDs achieved a maximum external quantum efficiency (EQEmax) of 31.5%, maximum power efficiency (PEmax) of 95.6 lm/W, and maximum current efficiency (CEmax) of 100.2 cd/A. Notably, II-hosted TADF-OLEDs also achieved a PEmax of 116.5 lm/W, turn-on voltage of 2.5 V, and impressive low efficiency roll-off performance (>89% of EQEmax at 5000 cd/m2), representing one of the highest efficiencies ever reported in 4CzIPN-doped devices. The high device efficiency can be ascribed to the balanced ambipolar carrier-transporting character of the host materials and high PLQY as well as the outstanding light outcoupling efficiency of the emitting layer.2,4,6-Trichloropyrimidine(cas: 3764-01-0SDS of cas: 3764-01-0) was used in this study.
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.SDS of cas: 3764-01-0
Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia