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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.

Active Publication Date: 2013-05-01
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, in compounds that emit fluorescence (hereinafter, referred to as fluorescent compounds), phosphorescence cannot usually be observed at room temperature, and only fluorescence can be observed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0088] This embodiment mode describes a light-emitting element according to one embodiment of the present invention.

[0089] The light-emitting element of this embodiment includes a light-emitting layer having a guest material as a light-emitting substance, a first organic compound, and a second organic compound. Specifically, a phosphorescent compound is used as a guest material. In addition, in this specification, among the first organic compound and the second organic compound, a material contained in a large amount in the light-emitting layer is referred to as a host material.

[0090] By employing 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 a high concentration of the guest material, the luminous efficiency of the light-emitting element can be improved.

[0091] In addition, in the present embodiment, each triplet exci...

Embodiment approach 2

[0180] In this embodiment refer to Figure 16A to Figure 16C A light-emitting element of one embodiment of the present invention will be described.

[0181] Figure 16A It is a diagram showing a light emitting element having an EL layer 102 between a first electrode 103 and a second 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 sequence on a first electrode 103, and a second layer disposed thereon. electrode 108 .

[0182] The first electrode 103 is preferably formed using any metal, alloy, conductive compound, mixture thereof, or the like that has a high work function (more specifically, 4.0 eV or higher). 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 Oxid...

Embodiment 1

[0242] In this example, 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 device of one embodiment of the present invention will be described.

[0243] The phosphorescent compound used in this example is bis(3,5-dimethyl-2-phenylpyrazinium)(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 ). Chemical formulas of materials used in this example are shown below.

[0244]

[0245]

[0246] Figure 1A and Figure 1B [Ir(mppr-Me) as a phosphorescent compound is shown 2 (dpm)] of the ultraviolet-visible absorption spectrum (hereinaf...

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PUM

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Abstract

The present invention addresses the problem of providing a display system of a hydraulic shovel and a control method therefor, the display system enabling excavation work to be performed accurately. A display system of a hydraulic shovel comprises a calculation unit and a display unit. On the basis of the position of the edge of a bucket (8) and positional information relating to a design surface (45), the calculation unit calculates the distance between a position closest to the design surface (45) among positions (C1-C5) in the width direction of the edge and the design surface (45). The display unit displays a guide screen. The guide screen includes an image indicating the positional relationship between the design surface (45) and the edge of the bucket (8), and information indicating the distance between the closest position and the design surface (45).

Description

technical field [0001] The present invention relates to a light-emitting device utilizing the phenomenon of organic electroluminescence (EL: Electroluminescence) (hereinafter, such a light-emitting device is also referred to as an organic EL device). Background technique [0002] Research and development of organic EL elements are actively carried out. The basic structure of an organic EL element is a structure in which a layer containing a light-emitting organic compound (hereinafter also referred to as a light-emitting layer) is interposed between a pair of electrodes. Organic EL elements are attracting attention as next-generation flat panel display elements because of their characteristics such as thinness and weight reduction, high-speed response to input signals, and low DC voltage drive. In addition, displays using such light-emitting elements are also characterized by excellent contrast and image quality as well as wide viewing angles. Furthermore, since the organi...

Claims

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Application Information

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IPC IPC(8): H01L51/50C07F15/00C09K11/06C07D209/86C07D239/26C07D241/12C07D333/76C07D409/10C07D471/04
CPCH01L51/0072H01L2251/5384H01L51/0059H01L2251/552C07D209/86C07D239/26C07D241/12C07D333/76C07D409/10C07D471/04C07F15/00C09K11/06C07F15/0033H10K85/00H10K85/631H10K85/6576H10K85/342H10K85/6572H10K50/11H10K2101/10H10K50/00H10K2101/90H10K2101/30C09K11/025H10K50/13H10K85/633H10K85/636H10K85/615H10K85/624H10K85/626H10K2101/27C09K2211/1007C09K2211/1074C09K2211/185
Inventor 下垣智子濑尾哲史大泽信晴井上英子铃木邦彦
Owner SEMICON ENERGY LAB CO LTD
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