We have designed and synthesized a series of organic wide bandgap materials, namely DCzSiCz, DDCzSi and DTCzSi, by incorporating carbazole/oligocarbazoles via a silicon-bridged linkage mode. All the materials show good thermal stability and excellent solution-processibility. Their HOMOs and LUMOs could be tuned to facilitate the efficient carriers injection by the incorporated carbazole/oligocarbazoles, while their singlet and triplet energy levels still maintain high levels, all above 3.44 eV and 2.87 eV, respectively. High efficient blue electrophosphorescent devices with low turn-on voltage are realized using DCzSiCz, DDCzSi and DTCzSi as hosts for FIrpic through solution-processable method. Among them, DCzSiCz-based device demonstrates the best performance, showing a maximum brightness of 6600 cd m−2 at 11 V and maximum luminous efficiency of 8.40 cd A−1 at 5 V.Graphical abstractA series of wide bandgap tetraphenyl silane materials by incorporating carbazole/oligocarbazoles via a silicon-bridged linkage mode are designed and synthesized. Their HOMOs and LUMOs could be tuned to facilitate the efficient carriers injection by the incorporated carbazole/oligocarbazoles, while their singlet and triplet energy levels still maintain high levels. Through solution-processable method, DCzSiCz/FIrpic-based device with the maximum luminous efficiency of 8.40 cd A−1 at 5 V is achieved.Highlights► A series of organic wide bandgap tetraphenyl silane materials are designed and synthesized. ► All these materials show excellent solution-processibility and good thermal stability. ► They are suitable as hosts for phosphorescent dye FIrpic. ► High performance solution-processed blue OLEDs are achieved.