An organic electroluminescent device includes an anode; a hole-transporting
layer disposed over the anode; a light-emitting layer disposed over the
hole-transporting layer for producing blue light in response to
hole-electron recombination, wherein the light emitting layer includes at
least one host material and at least one dopant material; a
non-hole-blocking buffer layer formed in contact with the light-emitting
layer, wherein the non-hole-blocking buffer layer has substantially the
same ionization potential and the same electron affinity as those of one
of the host materials in the light-emitting layer; an
electron-transporting layer disposed over the non-hole-blocking buffer
layer; and a cathode disposed over the electron-transporting layer.
