| 摘要 |
The present invention relates to luminescent compounds of lanthanide/Yb doped bismuth silicate that present a crystalline structure and are characterized by non-linear optical properties, particularly photon up-conversion following IR or NIR excitation. Furthermore, the present invention describes several synthesis routes for producing said compounds in different form (e.g. particles, core-shell particles, bulk crystal), dimension (e.g. nanoscale or microscale) and crystalline structure, which result in tunable optical properties in view of a specific application. Particularly, there are disclosed Er/ Yb, Ho/Yb, Tm/Yb doped bismuth silicate nanoparticles that emit up-conversion light of the three basic colors (RGB). As said compounds are non-cytotoxic and present attractive optical properties, they find a wide range of applications, both industrial (e.g. lighting, solar energy, anti-counterfeiting) and biomedical (e.g. drug delivery, bio-imaging, nanomedicine). |
