Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device
A technology of light-emitting elements and light-emitting layers, which is applied to electrical components, circuits, and electric solid-state devices. It can solve the problems of quantum dot emission spectrum peak width and narrowness, and achieve the effects of low power consumption, high reliability, and long service life.
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Embodiment approach 1
[0051] A current-excited light-emitting element (hereinafter, also referred to as a QLED element) using quantum dots as a light-emitting substance has the same characteristics as an organic EL element (hereinafter, also referred to as an OLED element) using an organic compound as a light-emitting substance: It is made thin and light; it is easy to manufacture a surface light source; it can form micro pixels; and it can be bent. Moreover, the color purity, service life, efficiency, and easy selectivity of light-emitting wavelengths of QLED elements are equal to or superior to OLED elements, so the research and development of QLED elements is increasingly strengthened.
[0052] Like the OLED element, the QLED element includes an EL layer including a light-emitting layer including quantum dots as a light-emitting substance between an anode and a cathode. Light emission can be obtained by passing a current through the EL layer. The EL layer may include other layers such as a hole...
Embodiment approach 2
[0127] In this embodiment mode, a light-emitting device using the light-emitting element described in Embodiment Mode 1 will be described.
[0128] In this embodiment mode, a light-emitting device manufactured using the light-emitting element shown in Embodiment Mode 1 will be described with reference to FIGS. 2A and 2B . Note that FIG. 2A is a plan view showing the light emitting device, and FIG. 2B is a cross-sectional view cut along lines A-B and C-D in FIG. 2A . This light-emitting device includes a driver circuit unit (source line driver circuit) 601 , a pixel unit 602 , and a driver circuit unit (gate line driver circuit) 603 indicated by dotted lines as a unit for controlling light emission of the light-emitting element. In addition, reference numeral 604 is a sealing substrate, reference numeral 605 is a sealant, and the inside surrounded by the sealant 605 is a space 607 .
[0129] Note that the lead wiring 608 is a wiring for transmitting signals input to the source...
Embodiment approach 3
[0175] In this embodiment, refer to Figure 6A and Figure 6B An example in which the light-emitting element described in Embodiment Mode 1 is used as a lighting device will be described. Figure 6B is the top view of the lighting device, Figure 6A is along Figure 6B The cross-sectional view of the e–f cut in .
[0176] In the lighting device of this embodiment, the first electrode 401 is formed on the light-transmitting substrate 400 serving as a support. The first electrode 401 corresponds to the anode 101 in the first embodiment. When light is extracted from the first electrode 401 side, the first electrode 401 is formed using a material having light transmittance.
[0177] A pad 412 for supplying a voltage to the second electrode 404 is formed on the substrate 400 .
[0178] An EL layer 403 is formed on the first electrode 401 . The EL layer 403 corresponds to the structure of the EL layer 103 in the first embodiment. In addition, for each configuration, the desc...
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