A polymer containing in the backbone a 9-oxo-9-phosphafluorene-2,7-diyl skeleton or a combination of the skeleton with a vinylene skeleton or arylene skeleton. In particular, data routing is performed based on a CDMA code. A feature of the light-emitting device is that light emitted by the light-emitting device in a main radiant direction satisfies specific requirements. The method further includes maintaining the dielectric layer as a surface passivation layer in the photovoltaic cell. These mechanisms and methods for routing messages to a server can enable dynamic data migration within a system, increased efficiency, improved user experience, avoidance of data loss, etc.