Light-emitting element, display device, electronic device, and lighting device
A technology of light-emitting devices and light-emitting elements, which is applied in the fields of products or compositions, processes, machines, and lighting devices. It can solve problems that have not been put into practical use and are difficult to develop compounds with high triplet excitation levels, and achieve high reliability and low power consumption. Reduced, the effect of low driving voltage
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Embodiment approach 1
[0074] In this embodiment, refer to Figure 1A to Figure 4B A light-emitting element according to one embodiment of the present invention will be described.
[0075]
[0076] First, the following will refer to Figure 1A to Figure 1C The structure of a light-emitting element according to one embodiment of the present invention will be described.
[0077] Figure 1A is a schematic cross-sectional view of a light emitting element 150 according to an embodiment of the present invention.
[0078] Light emitting element 150 includes a pair of electrodes (electrode 101 and electrode 102 ), and includes EL layer 100 provided between the pair of electrodes. The EL layer 100 includes at least a light emitting layer 130 .
[0079] in addition, Figure 1A The illustrated EL layer 100 includes functional layers such as a hole injection layer 111 , a hole transport layer 112 , an electron transport layer 118 , and an electron injection layer 119 in addition to the light emitting layer...
example 1
[0092] Figure 1C An example of correlation of energy levels in a light emitting layer of a light emitting element according to one embodiment of the present invention is shown. In this structural example, an example in which a phosphorescent compound is used for compound 131 is shown.
[0093] in addition, Figure 1C The energy level correlation of compound 131, compound 132, and compound 133 in the light emitting layer 130 is shown. Figure 1C The marks and symbols in are as follows.
[0094] Comp(131): Compound 131
[0095] Comp(132): Compound 132
[0096] · Guest(133): compound 133
[0097] ·T C1 : T1 energy level of compound 131
[0098] ·S C2 : S1 energy level of compound 132
[0099] ·T C2 : T1 energy level of compound 132
[0100] ·S G : S1 energy level of compound 133
[0101] ·T G : T1 energy level of compound 133
[0102] exist Figure 1C In , Compound 131 or Compound 132 forms an excited state by receiving holes and electrons. Here, since Compound ...
example 2
[0110] Figure 2B An example of energy level correlation in the light emitting layer 130 of the light emitting element 150 according to one embodiment of the present invention is shown. In this structural example, an example is shown in which compound 131 uses a phosphorescent compound, and compound 131 and compound 132 form an exciplex.
[0111] The combination of compound 131 and compound 132 may be any combination as long as it can form an exciplex, and one of them is preferably a compound having hole-transporting properties and the other is a compound having electron-transporting properties. In this case, a donor-acceptor type exciplex is formed more easily, and the exciplex can be efficiently formed. In addition, when the combination of Compound 131 and Compound 132 is a combination of a hole-transporting compound and an electron-transporting compound, the balance of carriers can be easily controlled by adjusting the mixing ratio. Specifically, the compound having hole-...
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Abstract
Description
Claims
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