High-performance non-doped near ultraviolet OLEDs with the EQE ∼ 6% and CIEy ∼ 0.03 from high-lying reverse intersystem crossing was written by Peng, Ling;Lv, Jichen;Xiao, Shu;Huo, Yumiao;Liu, Yuchao;Ma, Dongge;Ying, Shian;Yan, Shouke. And the article was included in Chemical Engineering Journal (Amsterdam, Netherlands) in 2022.Synthetic Route of C18N12 This article mentions the following:
Developing high-performance organic fluorophors with short-wavelength emission is both significant and challenging subject in the application of organic light-emitting diodes (OLEDs). A coupling hardness with distortion design concept is proposed to construct an efficient near UV (NUV) fluorophor mP2MPC with 1,4-dimethyl-2,5-diphenylbenzene as a rotatable bridge via the meta-positions linking rigid and bulky phenanthroimidazole and carbazole groups. The nondoped OLED with it as emitter not only exhibits an emission peak at 395 nm with the Commission Internationale de l’ećlairage coordinates of (0.163, 0.028), but also realizes a high forward-viewing external quantum efficiency of 6.09% due to the high-lying reverse intersystem crossing. The value still keeps ≤5.56% at 1000 cd m-2, showing a small efficiency roll-off. This is 1 of the highest efficiencies among the nondoped devices with the electroluminescence peak <400 nm. The green and red phosphorescent OLEDs with mP2MPC as host can also show excellent electroluminescence performance with the forward-viewing external quantum efficiencies over 21.5%, illustrating that mP2MPC should be a prospective material for OLEDs. 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: 105598-27-4Synthetic Route of C18N12).
Dipyrazino[2,3-f:2′,3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (cas: 105598-27-4) belongs to quinoxaline derivatives. Condensed heterocycles of quinoxalines have become attractive targets in synthetic and medicinal chemistry due to their significant biological activities. Modifying quinoxaline structure it is possible to obtain a wide variety of biomedical applications, namely antimicrobial activities and chronic and metabolic diseases treatment.Synthetic Route of C18N12
Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider