RESUMO
The photophysical and nonlinear optical properties of water-soluble chromophore-functionalised tris-dipicolinate complexes [LnL3](3-) (Ln=Yb and Nd) are thoroughly studied, revealing that only the Yb(III) luminescence can be sensitized by a two-photon excitation process. The stability of the complex in water is strongly enhanced by embedding in dispersible organosilicate nanoparticles (NPs). Finally, the spectroscopic properties of [NBu4]3 [YbL3] are studied in solution and in the solid state. The high brightness of the NPs allows imaging them as single objects using a modified two-photon microscopy setup in a NIR-to-NIR configuration.
Assuntos
Complexos de Coordenação/efeitos da radiação , Microscopia Confocal/métodos , Nanopartículas/efeitos da radiação , Ácidos Picolínicos/efeitos da radiação , Itérbio/química , Complexos de Coordenação/síntese química , Complexos de Coordenação/química , Luz , Nanopartículas/química , Ácidos Picolínicos/síntese química , Ácidos Picolínicos/química , Espectroscopia de Luz Próxima ao InfravermelhoRESUMO
Quantum dot (QD) LEDs of high color purity, and low turn-on voltage and leakage current are prepared using a solvent free method. First, a monolayer of QDs is formed at the air/water interface, which is then transferred with a PDMS stamp onto the device. The method is applicable to large substrates and reduces materials consumption as compared to other deposition techniques.
