The invention provides an organic light-emitting device, and relates to the technical field of organic photoelectricity. The organic light-emitting device comprises a substrate, a first
electrode, anorganic matter layer, a second
electrode, a first covering layer and a second covering layer, the first covering layer and the second covering layer are located on the outer side of the second
electrode, the first covering layer comprises a
nitrogen-containing
heterocyclic compound, and the second covering layer comprises an
organic matter or an inorganic matter. The
refractive index of the firstcovering layer material ranges from 1.8 to 2.2, the
refractive index of the second covering layer material is larger than that of the first covering layer, and the
refractive index meets the formula that n2-n1 is larger than or equal to 0.3. The compounds contained in the two covering
layers have higher refractive indexes, so that the light extraction efficiency of the device can be effectively improved; and because the refractive index difference value of the two covering layer materials is large, the microcavity effect is enhanced, the light extraction efficiency can be effectively improved,and the light emitting efficiency of the device is improved. Meanwhile, the introduction of the covering layer can effectively isolate
oxygen and
moisture in the air, thereby prolonging the service life of the device.