将不同数量的9 H-咔唑供体取代为2-(五氟苯基)-5-苯基-1,3,4-恶二唑会生成一系列具有相似的电化学带隙但光学性质不同的供体-受体化合物。咔唑在2位和4位上的每次取代都会导致第一个单重态激发态稳定在150–200 meV,这在荧光发射中很明显。第一三重态激发态对这些取代较不敏感,从而导致单态和三态态之间的能量分离减少,ΔE ST随咔唑含量的增加而增加。使用施主-受主化合物制得的OLED器件表现出最低的ΔE ST制备并显示出天蓝色发射,其外部量子效率在10 cd m -2时高达24.4%,在1000 cd m -2时高达9.2%。
Mild Copper‐Mediated Direct Oxidative Cross‐Coupling of 1,3,4‐Oxadiazoles with Polyfluoroarenes by Using Dioxygen as Oxidant
作者:Liang‐Hua Zou、Jakob Mottweiler、Daniel L. Priebbenow、Jun Wang、Jan Alexander Stubenrauch、Carsten Bolm
DOI:10.1002/chem.201204502
日期:2013.3.4
CH3CN and O2 do the trick! A copper‐mediateddirectoxidativecross‐coupling of 2‐(het)aryl‐1,3,4‐oxadiazoles with polyhaloarenes under mild reaction conditions has been developed (see scheme). The process provides a concise access to biaryl structures containing polyhaloarenes, which are of interest in the fields of pharmaceuticals and functional materials. Acetonitrile and oxygen play crucial roles
Manipulating peripheral non-conjugated substituents in carbazole/oxadiazole hybrid TADF emitters towards high-efficiency OLEDs
作者:Die Hu、Mengyuan Zhu、Changsheng Shi、Wenbo Yuan、Ning Sun、Bin Huang、Youtian Tao
DOI:10.1039/d1tc02778f
日期:——
The stepwise manipulation of peripheral substituents in TADF materials greatly increased both the PLQY and the device EQE, showing an over one order of magnitude increase in kRISC and a decrease in kTnr.