Provided are compounds of Formula R1R2R3M-L-M′; wherein M is Si or Ge; L is selected from the group consisting of a direct bond, or selected from the group consisting of O, S, Se, BR, BRR′, PR, CR, NR, C═O, C═S, C═NR, C═CRR′, CRR′, SO, SO2, SiRR′, GeRR′, and P(O)R; when L is a direct bond, M′ is SiR4R5R6 or GeR4R5R6; and when L is not a direct bond, M′ is SiR4R5R6, GeR4R5R6, or one or more hydrocarbon groups provided that at least one of the one or more hydrocarbon groups is a carbocyclic group. Also provided are formulations comprising these compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these compounds.