Organic electroluminescence device
AssigneeIdemitsu Kosan Co., Ltd.
InventorsToshinari Ogiwara, Chishio Hosokawa
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Abstract
An organic EL device includes a pair of electrodes and an organic compound layer between pair of electrodes. The organic compound layer includes an emitting layer including a first material and a second material. The second material is a fluorescent material. Singlet energy EgS(H) of the first material and singlet energy EgS(D) of the second material satisfy a relationship of the following formula (1). The first material satisfies a relationship of the following formula (2) in terms of a difference ΔST(H) between the singlet energy EgS(H) and an energy gap Eg77K(H) at 77K. EgS(H)>EgS(D) (1) ΔST(H)=EgS(H)−Eg77K(H)<0.3 (eV) (2)
Claims6
An organic electroluminescence device comprising a pair of electrodes and an organic compound layer between the pair of electrodes, the organic compound layer comprising an emitting layer comprising a first material and a second material, wherein
- the second material is a fluorescent material,
- singlet energy EgS(H) of the first material and singlet energy EgS(D) of the second material satisfy a relationship of a formula (1) below, and
- the first material satisfies a relationship of a formula (2) below in terms of a difference ΔST(H) between the singlet energy EgS(H) and an energy gap Eg77K(H) at 77K
- EgS(H)>EgS(D) (1)
- ΔST(H)=EgS(H)−Eg77K(H)<0.3 (eV). (2)
Dependencies are inferred from the claim text.