Used as a key intermediate in organic synthesis, particularly in the preparation of conjugated organic materials for optoelectronic devices. It serves as a building block in the formation of naphthalene-based polymers and small molecules used in organic semiconductors, OLEDs, and field-effect transistors. The iodine atoms enable further functionalization through cross-coupling reactions like Suzuki or Heck couplings, allowing precise extension of π-conjugated systems. Its rigid aromatic structure contributes to thermal stability and favorable charge transport properties in thin-film devices. Also employed in the synthesis of fluorescent dyes and probes where halogenated naphthalene cores enhance photophysical characteristics.