Light-emitting element
A technology of light-emitting elements and light-emitting layers, applied in the field of organic EL elements), can solve the problems of only observing fluorescence but not phosphorescence, etc., and achieve the effect of high quantum efficiency and long life.
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[0087] (Embodiment 1)
[0088] This embodiment mode describes a light-emitting element according to one embodiment of the present invention.
[0089] The light-emitting element of the present embodiment includes a light-emitting layer including a guest material as a light-emitting substance, a first organic compound, and a second organic compound. Specifically, a phosphorescent compound is used as the guest material. In addition, in this specification, among the 1st organic compound and the 2nd organic compound, the material contained in the light-emitting layer with a large content is called a host material.
[0090] By adopting a structure in which the guest material is dispersed in the host material, crystallization of the light-emitting layer can be suppressed. In addition, by suppressing concentration quenching due to the high concentration of the guest material, the light-emitting efficiency of the light-emitting element can be improved.
[0091] In addition, in this ...
Example Embodiment
[0179] (Embodiment 2)
[0180] Referring to this embodiment 16A to 16C A light-emitting element according to one embodiment of the present invention will be described.
[0181] Figure 16A It is a figure which shows the light emitting element which has the EL layer 102 between the 1st electrode 103 and the 2nd electrode 108. Figure 16A The light-emitting element includes: a hole injection layer 701, a hole transport layer 702, a light emitting layer 703, an electron transport layer 704, an electron injection layer 705 stacked in order on the first electrode 103, and a second electrode 108.
[0182] The first electrode 103 is preferably formed using any metal, alloy, conductive compound, mixture thereof, or the like having a high work function (specifically, 4.0 eV or more). Specifically, for example, indium oxide-tin oxide (ITO: Indium Tin Oxide, indium tin oxide), indium oxide-tin oxide containing silicon or silicon oxide, indium oxide-zinc oxide (Indium Zinc Oxide: ind...
Example Embodiment
[0241] [Example 1]
[0242] In this embodiment, refer to Figure 1A and Figure 1B An example of a combination of the first organic compound, the second organic compound, and the phosphorescent compound that can be applied to the light-emitting element of one embodiment of the present invention will be described.
[0243] The phosphorescent compound used in this example is bis(3,5-dimethyl-2-phenylpyrazinate)(dipivaloylmethane)iridium(III) (abbreviation: [Ir(mppr-Me) 2 (dpm)]). The first organic compound used in this example was 2-[3-(dibenzothiophen-4-yl)phenyl]dibenzo[f,h]quinoxaline (abbreviation: 2mDBTPDBq-II). The second organic compound used in this example is 4,4'-bis(1-naphthyl)-4''-(9-phenyl-9H-carbazol-3-yl)triphenylamine (abbreviation: PCBNBB ). The chemical formulas of the materials used in this example are shown below.
[0244]
[0245]
[0246] Figure 1A and Figure 1B shows [Ir(mppr-Me) as a phosphorescent compound 2 (dpm)] in the dichloromethane so...
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