Organic electroluminescent (EL) devices have been fabricated which have a MgF2layer doped withN, N’‐diphenyl‐N, N’‐bis(3‐methylphenyl)‐[1,1’‐biphenyl]‐4, 4’‐diamine (TPD) as the hole‐ transporting layer, and the emitting layer oftris‐(8‐hydroxyquinoline) aluminum (Alq). For the organic EL devices, bright green emission with 2600 cd/m2is observed at a voltage of 15 V. The luminous efficiency is about 0.3 lm/W at a current density of 100 mA/cm2. This high efficiency indicates that the diamine doped MgF2layer plays the role of hole transport and confinement of electrons in the emitting layer. It is also found that the thermal stability of the organic EL device is higher than that of the conventional organic EL device. ©1995 American Institute of Physics.