Tris-[3-(3-pyridyl)mesityl]borane (3TPYMB) with high triplet excited energy level was synthesized and investigated as an electron-transport material for organic light-emitting devices (OLEDs). Larger current density and higher luminance were observed for the OLED using 3TPYMB, compared with the OLED with a conventional electron-tran sport material, tris(8-quinolinolato)aluminum (Alq(3)).