LIGHT-EMITTING ELEMENT, LIGHT-EMITTING DEVICE, ELECTRONIC DEVICE, AND LIGHTING DEVICE
First Claim
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1. A light-emitting device comprising:
- a first electrode;
a light-emitting layer over the first electrode, the light-emitting layer comprising a first organic compound, a second organometallic compound, and a third organometallic compound; and
a second electrode over the light-emitting layer,wherein a T1 level of the first organic compound is lower than a T1 level of the second organometallic compound and higher than a T1 level of the third organometallic compound,wherein an emission from the second organometallic compound exhibits a multicomponent decay curve, andwherein a lifetime of the emission is more than or equal to 5 μ
sec and less than or equal to 15 μ
sec where the lifetime is a time required for the emission to decrease in intensity to 1/100 of an initial value thereof.
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Abstract
Provided is a light-emitting element having a light-emitting layer which contains at least a host material and a plurality of guest materials, where the host material has a lower T1 level than that of at least one of the plurality of guest materials. The emission of the one of the plurality of guest materials exhibits a multicomponent decay curve, and the lifetime thereof is less than or equal to 15 pec, preferably less than or equal to 10 pec, more preferably less than or equal to 5 pec, where the lifetime is defined as a time for the emission to decrease in intensity to 1/100 of its initial intensity.
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Citations
18 Claims
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1. A light-emitting device comprising:
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a first electrode; a light-emitting layer over the first electrode, the light-emitting layer comprising a first organic compound, a second organometallic compound, and a third organometallic compound; and a second electrode over the light-emitting layer, wherein a T1 level of the first organic compound is lower than a T1 level of the second organometallic compound and higher than a T1 level of the third organometallic compound, wherein an emission from the second organometallic compound exhibits a multicomponent decay curve, and wherein a lifetime of the emission is more than or equal to 5 μ
sec and less than or equal to 15 μ
sec where the lifetime is a time required for the emission to decrease in intensity to 1/100 of an initial value thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A light-emitting device comprising:
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a first electrode; a light-emitting layer over the first electrode, the light-emitting layer comprising a first organic compound, a second organometallic compound, and a third organometallic compound; and a second electrode over the light-emitting layer, wherein a T1 level of the first organic compound is lower than a T1 level of the second organometallic compound and higher than a T1 level of the third organometallic compound, wherein an emission from the light-emitting layer exhibits a multicomponent decay curve, and wherein a lifetime of the emission is more than or equal to 5 μ
sec and less than or equal to 15 μ
sec where the lifetime is a time required for the emission to decrease in intensity to 1/100 of an initial value thereof. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification