High electron mobility triazine for lower driving voltage and higher efficiency organic light emitting devices

摘要

The triazine compound 4,4'-bis-[2-(4,6-diphenyl-l,3,5-triazinyl)]-1,1'-biphenyl (BTB) was developed for use as an electron transport material in organic light emitting devices (OLEDs). The material demonstrates an electron mobility of ～7.2 × 10~(-4) cm~2 V~(-1) s~(-1) at a field of 8.00 × 10~5 V cm~(-1), which is 10-fold greater than that of the widely used material tris(8-hydroxyquinoline) aluminum (AlQ_3). OLEDs with a BTB electron transport layer showed a ～1.7-2.5 V lower driving voltage and a significantly increased efficiency, compared to those with AlQ_3. These results suggest that BTB has a strong potential for use as an OLED electron transport layer material.