Electron injection composition for light emitting element, light emitting element, and light emitting device
A technology for light-emitting elements and electronic devices, which can be used in household components, electric solid-state devices, electrical components, etc., and can solve the problems of difficult to maintain amorphous state, easy crystallization, and shortening.
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[0035] figure 1 shows the element structure of the light-emitting element of the present invention, such as figure 1 As shown, its basic structure is that a layer 102 containing a luminescent substance is sandwiched between a pair of electrodes (first electrode 101 and second electrode 103), and the layer 102 containing a luminescent substance at least includes a luminescent layer 104 and The electron injection layer 105 composed of an electron injection component used in a light-emitting element may be appropriately combined with a hole injection layer, a hole transport layer, a hole blocking layer, an electron transport layer, etc. in addition to this structure. In addition, the case where the first electrode 101 formed on the substrate 100 functions as an anode and the second electrode 103 functions as a cathode will be described here.
[0036] In addition, in the present invention, an alkali metal, an alkaline earth metal, or a transition metal is doped into a benzoxazole...
Embodiment 1
[0077] This example will use figure 2 In a structure in which light generated by a layer containing a luminescent substance is emitted from both sides of a first electrode and a second electrode of a light-emitting element (hereinafter referred to as a double-sided emission structure), an electron injection layer is provided as a layer containing a luminescent substance. A part of the light-emitting element of the present invention.
[0078] First, the first electrode 201 of the light emitting element is formed on the substrate 200 . Note that the first electrode 201 functions as an anode in this embodiment. Using the transparent conductive film ITO as a material, the first electrode 201 was formed with a thickness of 110 nm by a sputtering method.
[0079]Next, a layer 202 containing a luminescent substance is formed on the first electrode (anode) 201 . Note that the layer 202 containing the luminescent substance in this embodiment is a laminated structure composed of a h...
Embodiment 2
[0099] This example will use image 3 The case where the light generated by the layer containing the luminescent substance is emitted from one side of the light-emitting element, especially the structure in which light is emitted from the side of the second electrode formed on the layer containing the luminescent substance (hereinafter referred to as top emission structure) will be described. .
[0100] Note that only the parts different from those of Embodiment 1 will be described here, and the description of the same structure as Embodiment 1 except for the first electrode will be omitted in this embodiment.
[0101] The first electrode 301 of this embodiment functions as an anode, and is an electrode that does not emit light generated by the layer 302 containing a luminescent substance. In other words, the first electrode can use nitrides or carbides belonging to Group 4, Group 5, or Group 6 of the periodic table of elements with a large work function and light-shielding p...
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Abstract
Description
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Application Information
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