Light-Emitting Element, Light-Emitting Device, Display Device, Electronic Device, and Lighting Device
a technology of light-emitting devices and light-emitting elements, which is applied in the direction of semiconductor devices for light sources, lighting and heating apparatus, organic chemistry, etc., can solve the problems of reducing efficiency and preventing efficient light emission by certain substances, and achieve the effect of reducing efficiency and preventing efficient light emission
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embodiment 1
[0047]As a method for converting a triplet excited state into light emission, there are a method utilizing phosphorescence, which is direct emission from a triplet excited state, and a method utilizing delayed fluorescence, which is light emitted from a singlet excited state after a triplet excited state is turned into a singlet excited state via reverse intersystem crossing.
[0048]A structure of a light-emitting element that uses a phosphorescent material and emits light with extremely high efficiency has been reported, which actually proves advantages of the utilization of a triplet excited state for light emission. However, central metals of phosphorescent materials are mostly rare metals, and there are concerns about cost and supply in mass production.
[0049]Some degree of success in a light-emitting element using a delayed fluorescent material has been achieved in recent years. However, a substance emitting delayed fluorescence with relatively high efficiency has an extremely rar...
embodiment 2
[0083]In this embodiment, a detailed example of the structure of the light-emitting element described in Embodiment 1 will be described below with reference to FIGS. 1A and 1B.
[0084]In FIG. 1A, the light-emitting element includes a first electrode 101, a second electrode 102, and a layer 103 containing an organic compound and provided between the first electrode 101 and the second electrode 102. Note that in this embodiment, the first electrode 101 functions as an anode, and the second electrode 102 functions as a cathode. In other words, when a voltage is applied between the first electrode 101 and the second electrode 102 so that the potential of the first electrode 101 is higher than that of the second electrode 102, light emission can be obtained. The layer 103 containing an organic compound includes at least a light-emitting layer 113. A hole-injection layer 111, a hole-transport layer 112, an electron-transport layer 114, and an electron-injection layer 115 which are illustrat...
embodiment 3
[0119]In this embodiment, a light-emitting device including the light-emitting element described in Embodiment 1 or Embodiment 2 is described.
[0120]In this embodiment, a light-emitting device manufactured using the light-emitting element described in Embodiment 1 or Embodiment 2 is described with reference to FIGS. 2A and 2B. Note that FIG. 2A is a top view illustrating the light-emitting device and FIG. 2B is a cross-sectional view of FIG. 2A taken along lines A-B and C-D. This light-emitting device includes a driver circuit portion (source line driver circuit) 601, a pixel portion 602, and a driver circuit portion (gate line driver circuit) 603, which control light emission of the light-emitting element and are denoted by dotted lines. Moreover, a reference numeral 604 denotes a sealing substrate; 605, a sealing material; and 607, a space surrounded by the sealing material 605.
[0121]Note that a lead wiring 608 is a wiring for transmitting signals to be input to the source line dri...
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Abstract
Description
Claims
Application Information
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