Efficient circularly polarized photoluminescence and electroluminescence of chiral spiro-skeleton based thermally activated delayed fluorescence molecules was written by Zhang, Yi-Pin;Song, Shi-Quan;Mao, Meng-Xi;Li, Cheng-Hui;Zheng, You-Xuan;Zuo, Jing-Lin. And the article was included in Science China: Chemistry in 2022.SDS of cas: 105598-27-4 This article mentions the following:
Chiral thermally activated delayed fluorescence (TADF) mols. showing circularly polarized luminescence (CPL) have great potential in 3D displays. However, the relationships among CPL property, device performance and mol. structure are still not clear. In this article, we develop a strategy to promote dissymmetry factors without sacrifice in device performance and study the impact of mol. structures towards CPL property. Three novel TADF enantiomers are synthesized and studied. (R/S)-SCN with diminutive cyano group as an acceptor shows dissymmetry factor |gPL| ∼ 1.4×10-3 and noticeable organic light-emitting diode (OLED) performances with a maximum external quantum efficiency (EQEmax) of 23.0%. For (R/S)-SPHCN, the prolonged electron withdrawing group benzonitrile enhances |gPL| up to 3.6×10-3 with decreased device EQEmax of 15.4%. By further replacing benzonitrile with (trifluoromethyl)pyridine, the enantiomers of (R/S)-SCFPY show similar |gPL| factors of 3.5×10-3 and device EQEmax up to 23.3%, which represents the highest efficiency among sprio-type TADF materials based OLEDs. Furthermore, the OLEDs also show obvious circularly polarized electroluminescence with gEL factors of -1.4/1.8×10-3, -3.6/3.6 x10-3 and -3.7/3.6×10-3, resp. These results indecate by delicate functional group engineering, high g factor can be achieved while maintaining decent device performances. Besides, (R/S)-SCFPY represents an impressive TADF emitter, which shows promoted g factor and recorded high device EQEmax among similar mols. In the experiment, the researchers used many compounds, for example, Dipyrazino[2,3-f:2′,3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (cas: 105598-27-4SDS of cas: 105598-27-4).
Dipyrazino[2,3-f:2′,3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (cas: 105598-27-4) belongs to quinoxaline derivatives. Quinoxalines have received a significant amount of attention due to their potential use in fighting various pathophysiological conditions like epilepsy, Parkinson’s, and Alzheimer’s diseases. Quinoxalines are used as dyes, pharmaceuticals, and antibiotics such as echinomycin, levomycin exhibiting antitumoral properties. Quinoxalines establish also the basis of anthelmintics and receptor antagonists.SDS of cas: 105598-27-4
Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider