An organic electroluminescent device is disclosed, comprising a substrate having
thereon a light-emitting layer sandwiched by an anode and a cathode, wherein the
light-emitting layer comprises at least:
- (1) a host material having electron-transporting or hole-transporting property,
- (2) Compound A capable of phosphorescence emission at room temperature, and
- (3) Compound B capable of phosphorescence emission or fluorescence emission
at room temperature and having the maximum light emission wavelength longer than
the maximum light emission wavelength of Compound A,
and the maximum light emission wavelength of said device is attributable to said
(3). The light emission attributable to (3) is intensified by (2) to elevate the
light emission efficiency and by selecting a fluorescent compound as (3), the device
can be prevented from aging deterioration of the luminance.
