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AssigneeIdemitsu Kosan Co., Ltd.
InventorsSatomi Tasaki, Kazuki Nishimura, Ryoji Maeda, Yuichiro Kawamura, Yuki Nakano
Estimating the term…
An organic EL device includes a first emitting layer and a second emitting layer, in which the first emitting layer contains a first host material, the second emitting layer contains a second host material, the first and the second host material are mutually different, the first emitting layer and the second emitting layer at least contains a compound that emits fluorescence having a main peak wavelength of 500 nm or less, respectively, the compound contained in the first emitting layer and that emits fluorescence having a main peak wavelength of 500 nm or less is the same as or different from the compound contained in the second emitting layer, and a triplet energy T1(H1) of the first host material and a triplet energy T1(H2) of the second host material satisfy a numerical formula (Numerical Formula 1), T1(H1)>T1(H2) (Numerical Formula 1).
An organic electroluminescence device comprising:
Dependencies are inferred from the claim text.