Fluorene-Based π-Conjugated Oligomers for Efficient Three-Photon Excited Photoluminescence and Lasing
作者:Xin Jiang Feng、Po Lam Wu、Hoi Lam Tam、King Fai Li、Man Shing Wong、Kok Wai Cheah
DOI:10.1002/chem.200901460
日期:2009.11.2
π‐conjugated oligomers that includes extended oligofluorenes and oligothienylfluorenes has been synthesized by means of the palladium‐catalyzed Suzuki cross‐coupling of 9,9‐dibutyl‐7‐(diphenylamino)‐2‐fluorenylboronic acid and the corresponding 1,2,4,‐triazole‐based aryl halide as a key step. It was demonstrated that efficient two‐ and three‐photon excited photoluminescence and lasing in the blue region
通过钯催化的Suzuki交联偶联反应9,合成了一系列新颖的二苯基氨基和1,2,4-三唑封端的芴基π共轭低聚物,包括扩展的低聚芴和低聚噻吩基芴。 9-二丁基-7-(二苯氨基)-2-芴基硼酸和相应的基于1,2,4,三唑的芳基卤化物是关键步骤。结果表明,通过在这些材料上泵浦近红外飞秒激光,可以在蓝色区域获得有效的两光子和三光子激发的光致发光和激光发射。尽管高荧光和延伸的低聚芴的吸收和发射最大值达到饱和极限,但在同源低聚系列中,对于最佳的三光子吸收横截面,仍存在有效的共轭长度。另一方面,在飞秒范围内已获得−77 cm 6 s 2,从而突显了该系列光子材料的潜力。无腔三光子上转换的蓝色激光光谱在半最大值处的优化全宽急剧缩小到大约6 nm,效率高达0.013%。