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TSPO1, diphenyl[4-(triphenylsilyl)phenyl]phosphine oxide, has a structure of triphenylsilane connecting triphenyl?phosphine oxide. Comparing with UGH-2, TSPO1 has?large permanent dipole moment due to the polar phosphine oxide group and its asymmetric?structure.

TSPO1 is a phosphine oxide-based blocking and host material with triplet energy excitons. It is mainly used in the formation of a blocking layer that enhances the performance of organic electronic devices like organic light-emitting diodes (OLEDs), and delayed fluorescent devices.

TSPO1 is an electon transfer layer (ETL) or hole blocking layer (HBL) in OLED devices.