Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device
First Claim
1. A light-emitting device comprising:
- a light-emitting layer,wherein emission time-dependence of emission intensity of the light-emitting device is represented by a multicomponent decay curve, andwherein an emission time of a slowest component of the multicomponent decay curve is less than or equal to 15 μ
sec where the emission time is a time required for the emission intensity to become 1/100.
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Accused Products
Abstract
A light-emitting element of the present invention can have sufficiently high emission efficiency with a structure including a host material being able to remain chemically stable even if a phosphorescent compound having higher emission energy is used as a guest material. The relation between the relative emission intensity and the emission time of light emission obtained from the host material and the guest material contained in a light-emitting layer is represented by a multicomponent decay curve. The relative emission intensity of the slowest component of the multicomponent decay curve becomes 1/100 for a short time within a range where the slowest component is not interfered with by quenching of the host material (the emission time of the slowest component is preferably less than or equal to 15 μsec); thus, sufficiently high emission efficiency can be obtained.
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Citations
16 Claims
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1. A light-emitting device comprising:
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a light-emitting layer, wherein emission time-dependence of emission intensity of the light-emitting device is represented by a multicomponent decay curve, and wherein an emission time of a slowest component of the multicomponent decay curve is less than or equal to 15 μ
sec where the emission time is a time required for the emission intensity to become 1/100. - View Dependent Claims (2, 3, 4)
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5. A light-emitting device comprising:
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a light-emitting layer comprising at least a first organic compound and a second organic compound, wherein the first organic compound and the second organic compound are selected so that emission time-dependence of emission intensity of the light-emitting device is represented by a multicomponent decay curve, and wherein an emission time of a slowest component of the multicomponent decay curve is less than or equal to 15 μ
sec where the emission time is a time required for the emission intensity to become 1/100. - View Dependent Claims (6, 7, 8, 9)
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10. A light-emitting device comprising:
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a light-emitting layer comprising a guest material and a host material, wherein a T1 level of the guest material is equal to or lower than a T1 level of the host material, wherein the guest material and the host material are selected so that emission time-dependence of emission intensity of the light-emitting device is represented by a multicomponent decay curve, and wherein an emission time of a slowest component of the multicomponent decay curve is less than or equal to 15 μ
sec where the emission time is a time required for the emission intensity to become 1/100. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification