An organic light emitting element includes a pair of electrodes at least one of which has visible light transmittance; and an organic EL layer provided between the pair of electrodes. The organic EL layer includes at least an organic light emitting layer that emits light when a voltage is applied between the pair of electrodes. The organic light emitting layer includes an electron transport host material; and at least first and second guest materials. Each of the first and second guest materials has an emission peak in a blue to blue-green color region. The electron transport host material has an ionization potential (IPH) and an electron affinity (AFH), and the first guest material has an ionization potential (IPG1) and an electron affinity (AFG1) that satisfy Expression (1): IPHâ‰¦IPG1 and AFH<AFG1 (1). The organic light emitting element has significantly improved efficiency without any influence on driving voltage.

Claims

6 · 1 independent · depth 3

6 granted claims

›1.independentAn organic light emitting element, comprising:na pair of electrodes at least one of which has visible light transmittance; andan organic EL layer prov…+5

›2.↳ 1The organic light emitting element according to claim 1, wherein the electron transport host material has a first optical band gap (EGH), wherein the …d2+2

›5.↳ 1The organic light emitting element according to claim 1, wherein the second guest material has a third ionization potential (IPG2), a third electron a…d2

›6.↳ 1The organic light emitting element according to claim 1, wherein the first guest material has a concentration that is less than 0.5 mass % with respec…d2

Classifications

3 codes

IPC · International Patent Classification

Section H — Electricity

H01L35/24

USPC · US Patent Classification

257/40257/E51.001

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Pendency

3.9 y

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Examiner

Anthony Ho

art unit 2815 · TC 2800

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Citations: 11 back · 0 forward

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20110291082 A1	1 Dec 2011

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