A novel fluorene-based gold(Ⅰ) complex with aggregate fluorescence change: a single-component white light-emitting luminophor

摘要

A new fluorene-based white tight-emitting gold(Ⅰ) complex with aggregate fluorescence change is reported. The novel luminogen emits direct white light in the solid state without involving complex doping/mixing procedures. The development of efficient luminescent organic materials has attracted widespread attention due to their potential practical applications in the fields of sensors, storage, photoelectronic devices and optical devices. However, the emission efficiency of most organic fluorescent materials tends to be weakened when aggregated in the condensed phase due to the aggregation-caused quenching (ACQ) effect. This ACQ phenomenon has seriously limited the high technology application of many conventional luminescent molecules. In 2001, Tang et al. found an unusual luminescence phenomenon in some propeller-shaped molecules. This phenomenon is widely known as aggregation-induced emission (AIE). Although these luminogens with AIE characteristics are weakly emissive or non-emissive in solution, they become intensely emissive upon aggregate formation. Hence, this new phenomenon is exactly the opposite of the ACQ effect In addition, oligomers and polymers based on fluorene are very valuable candidates for light emitting diodes, whereas the ACQ effect is the main obstacle in the efficient application of these materials with fluorene as skeletons. Therefore, the discovery of luminogens based on fluorene with highly emissive features in the aggregated state is significant White light-emitting devices have enormous potential in various lighting applications. For example, white organic light-emitting diodes (WOLEDs) have attracted widespread attention because they can be used for full-color flat-panel displays and solid-state lighting.