HETEROSPIRO-COMPOUNDS AND THEIR USE AS ELECTROLUMINESCENT MATERIALS

摘要

Hetero-spiro compounds of the formula (I),whereΨis an element of the 4th main group of the Periodic Table with the exception of carbon, preferably Sn, Ge or Si, particularly preferably Ge or Si, andK1 and K2 are, independently of one another, conjugated systems, for use in electroluminescence devices. The compounds of the formula (I) have a good solubility in customary organic solvents, improved film-forming properties and a significantly reduced tendency to crystallize.