Spirobifluorene derivative: a pure blue emitter (CIEy ≈ 0.08) with high efficiency and thermal stability
作者:Xing Xing、Lixin Xiao、Lingling Zheng、Shuangyuan Hu、Zhijian Chen、Bo Qu、Qihuang Gong
DOI:10.1039/c2jm32512h
日期:——
A spirobifluorene derivative containing phenanthrene moiety, 2,7-di(phenanthren-9-yl)-9,9â²-spirobifluorene (DPSF), has been synthesized. It shows absorption peaks at 254 nm, 310 nm, and 327 nm and a fluorescence peak at 383 nm in CHCl3 that shifts to 398 nm in the film state. The quantum yield is 0.79 calibrated with a standard of coumarin 102 (0.93). A pure blue emission at Commission Internationale de lâ²Ãclairage (CIE) (0.15, 0.08), has been achieved using DPSF as the emitter, poly(3,4-ethylene dioxythiophene)â:âpoly(styrene sulfonic acid) (PEDOTâ:âPSS) as the hole injecting layer, 4,4â²-bis[N-(1-naphthyl)-N-phenyl-amino] biphenyl (NPB) as the hole transporting layer, and 1,3,5-tris(N-phenylbenzimidazol-2-yl)-benzene (TPBI) mixing with 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PBD) (2â:â1) as the electron transporting material. The maximum current efficiency (CE) and power efficiency (PE) of the DPSF device are 3.24 cd Aâ1 and 2.54 lm Wâ1, corresponding to 5.41% of maximum external quantum efficiency (EQE). The spirobifluorene derivative show high thermal stabilities, 178 °C for the glass transition temperature (Tg) and 503 °C for the decomposition temperature (Td). The synthesized spirobifluorene derivative shows potential application as a highly efficient pure blue emitter for organic light emitting devices (OLED).
合成了一种含苯并蒽部分的螺二氟荧光素衍生物,名称为2,7-di(phenanthren-9-yl)-9,9′-spirobifluorene (DPSF)。该化合物在氯仿中显示出254 nm、310 nm和327 nm的吸收峰,并且在薄膜状态下荧光峰位移至398 nm。量子产率为0.79,以香豆素102(0.93)作为标准进行校准。使用DPSF作为发射体,聚(3,4-乙烯二氧噻吩):聚(苯乙烯磺酸)(PEDOT:PSS)作为注孔层,4,4′-双[ N-(1-萘基)-N-苯基氨基]联苯(NPB)作为孔传输层,以及与2-叔丁基苯基-5-二苯基-1,3,4-噁二唑(PBD)(2:1)混合的1,3,5-三(N-苯基苯并咪唑-2-基)-苯(TPBI)作为电子传输材料,已实现纯蓝色发光,CIE坐标为(0.15, 0.08)。DPSF器件的最大电流效率(CE)和功率效率(PE)分别为3.24 cd A⁻¹和2.54 lm W⁻¹,外部量子效率(EQE)达到最大5.41%。该螺二氟荧光素衍生物显示出较高的热稳定性,玻璃转变温度(Tg)为178 °C,分解温度(Td)为503 °C。合成的螺二氟荧光素衍生物展现出作为有机发光二极管(OLED)中高效纯蓝发射体的潜在应用。