Spirobifluorene modified electron transport materials for high efficiency in phosphorescent organic light-emitting diodes

Abstract

Spirobifluorene modified materials, 2,7-bis(4,6-diphenyl-1,3,5-triazin-2-yl)-9,9'-spirobi[fluorene] (SBFTrz) , 2,7-bis(4-phenylbenzo[4,5]thieno[3,2-d]pyrimidin-2-yl)-9,9'-spirobi[fluorene] (SBFBTP) and 2,7-bis(4-phenylbenzofuro[3,2-d]pyrimidin-2-yl)-9,9'-spirobi[fluorene] (SBFBFP) , which have good electron transport and thermal properties were developed as the electron transport layers (ETL). The common...

P‐210: Photolithography Patterning of Organic Light‐Emitting Diodes Using Solvent Resistant Electron Transport Materials

“…For this reason, we used '2,7-bis(4,6diphenyl-1,3,5-triazin-2-yl)-9,9′-spirobi[fluorene] (SBFTrz)' as an ETL, which is a chemically durable organic materials with excellent resistance to fluorinated solvents. [4]. We evaluated the stability of the device with the deposited ETL and identified the factors contributing to the degradation of device electroluminescence (EL) properties and efficiency during photolithography patterning process.…”

Green production of 9-aryl-fluoren-9-ols achieved through process intensification of the Grignard reaction using continuous flow at room temperature

“…The synthesis of 9-aryl-fluoren-9-ols is typically achieved through the Grignard reaction. [15][16][17] However, the presence of solvents, moisture, temperature, and other factors in the Grignard reaction system increases the likelihood of production safety incidents due to improper control. In addition, batch reactions for the synthesis of 9-aryl-fluoren-9-ols (Fig.…”

“…9–14 However, mass production of SBF in reaction kettles has encountered issues such as discontinuity, long reaction times, high reaction temperatures, and scaling effects. 15–17 Significantly, recent advances in end-to-end continuous flow synthesis are rapidly expanding and of considerable industrial and social significance, 25,26 so we attempted to synthesize SBF in continuous flows. To our delight, we successfully achieved the end-to-end synthesis of SBF by connecting the Grignard reaction and the Friedel–Crafts reaction in series through continuous flow techniques (Scheme 2).…”

Research progress on spirofluorene-based closed-loop compounds

“…并赋予螺环分子优异 的化学和物理性质, 其中刚性结构和螺共轭效应能够 抑制聚集态形成 [3] , 并促进电子转移过渡态形成 [4] , 大 大提高了材料的溶解性、稳定性以及发光性能 [5,6] . 这 些特性使螺环芳烃及其衍生物常被作为发光材料、基 准空穴传输材料 [7] 及有机半导体材料 [8] 应用于有机电 致发光器件(OLED) [9] 、有机光伏器件(OPV)和有机场 效应晶体管(OFET) [10] 等领域.…”