6,6-Diphenylfulvene is primarily used in organic synthesis and materials science. It serves as a key intermediate in the preparation of various organic compounds, particularly in the development of conjugated polymers and organic semiconductors. Its unique structure allows it to participate in Diels-Alder reactions, making it valuable for constructing complex molecular frameworks. Additionally, it is explored in the field of optoelectronics for its potential in creating light-emitting diodes (LEDs) and photovoltaic devices due to its electronic properties. Researchers also investigate its use in fluorescent dyes and sensors, leveraging its ability to exhibit distinct photophysical behavior.