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US07768195B2 Organic electroluminescent device with improved luminous efficiency 有权
具有改善发光效率的有机电致发光器件

Organic electroluminescent device with improved luminous efficiency
Abstract:
An organic electroluminescent device (20) including an anode (1), a first emitting layer (3), a carrier barrier layer (4), a second emitting layer (5), and a cathode (7) stacked in that order. The first emitting layer (3) is formed of a hole transporting material, and the second emitting layer (5) is formed of an electron transporting material. The affinity level of the carrier barrier layer (4) is smaller than the affinity level of the second emitting layer (5) in an amount of 0.2 eV or more, and the ionization potential (Ie1) of the carrier barrier layer (4) and the ionization potential (Ih1) of the first emitting layer (3) satisfy Ie1
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