Provided are organic compounds including a structure wherein two 6-membered aromatic rings are connected with a direct bond and further linked by a linker selected from the group consisting of O, S, Se; NR, BR, BRR′, PR, CR, C═O, C═NR, C═CRR′, C═S, CRR′, SO, SO2, P(O)R, SiRR′, and GeRR′ so to form a 5-membered ring including the linker. Also provided are formulations comprising these organic compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these organic compounds.