摘要
利用简单合成法首次合成了3种新的咔唑-吡啶-查尔酮衍生物,结合SEM谱图、紫外吸收光谱和荧光光谱分析发现,样品中吡啶-查尔酮基团增多有利于聚集体形成且颗粒尺寸变小,可达到纳米级。3种样品均呈J-型堆积聚集。稳态/瞬态荧光测试结果表明,由于溶液态到聚集态,3个样品的荧光量子产率提高,辐射衰减寿命增大,导致化合物聚集体的辐射衰减速率增大,非辐射衰减速率降低。
We have synthesized three new chromophores containing carbazole as donor and o-pyridyl chalcone as acceptor and prepared micro/nano-particles.Based on SEM spectrum and UV absorption and fluorescence measurements,we have found that the more o-pyridyl chalcone and smaller particles in the aggregation that tends to the J-type aggregation.And the group of o-pyridyl chalcone has contribution to the aggregation-induced emission enhancement（AIEE）.Steady and time resolution of fluorescence measurements indicate that chromophores in aggregation state have expanded fluorescence lifetime,accompanying with high quantum yield,in comparison with those in solution state.Thus,the radiative decay constants（kf） of chromophores in aggregate become increasing and the same time the nonradiative decay constants（knf） of chromophores in aggregate become decreasing,which results in the obvious the aggregation-induced emission enhancement（AIEE）.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第9期1686-1689,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50973077)
苏州市科技发展资助项目(SYJG0931)
关键词
咔唑查尔酮衍生物
聚集诱导荧光增强
J-聚集
纳米粒子
carbazole-chalcone derivative
aggregation-induced emission enhancement
J-aggregation
nano-particles
time resolution
