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Light-emitting device

A technology of light-emitting elements and light-emitting layers, applied in electrical components, light-emitting materials, electroluminescent light sources, etc., can solve the problems of lack, not bringing brightness and luminous efficiency, unable to achieve sufficient brightness and luminous efficiency, etc. Efficiency, the effect of expanding the recombination area

Inactive Publication Date: 2013-03-27
DAI NIPPON PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, as the literature figure 1 As shown, the light-emitting element proposed in this document has a light-emitting layer that is a monomolecular film of quantum dots, so there is a problem that excitons generated by recombination of charges injected from both electrodes do not reach the monomolecular film. The opportunity to emit light is consumed by EL, and cannot achieve sufficient brightness and luminous efficiency
Furthermore, in this document, an attempt was made to provide a hole blocking layer between the light-emitting layer and the electron transport layer to increase the recombination probability in the light-emitting layer, but it did not bring sufficient brightness and luminous efficiency.

Method used

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Examples

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Embodiment 1

[0087] On a glass substrate, first, a thin film (thickness: 150 nm) of indium tin oxide (ITO) was formed by a sputtering method to form an anode. The substrate on which the anode was formed was cleaned and subjected to UV ozone treatment. Then, in the air, a polyethylenedioxythiophene-polystyrenesulfonate (abbreviation: "PEDOT-PSS") coating solution was applied on the ITO film by spin coating, and dried to form a hollow film. Hole injection layer (thickness: 20 nm).

[0088] Next, N,N-diphenyl-N,N-di( 3-methylphenyl)-1,1-biphenyl-4,4-diamine (TPD) and quantum dots (manufactured by Evident Technologies, core: CdSe, shell: ZnS, emission wavelength: 520nm) mixed with toluene The mixed solution was spin-coated on the hole injection layer to form a hole transport layer and a light emitting layer (total thickness: 40 nm). The hole transport layer and light-emitting layer are separated from the quantum dots of TPD, and the light-emitting layer composed of quantum dots is formed as...

Embodiment 2

[0096] In Example 1, the hole-transporting layer and the light-emitting layer are formed simultaneously by applying a mixed solution of TPD and quantum dots with a mixing ratio of 9:5 on the hole-injecting layer, and then forming a 60nm-thick layer composed of BAlq2. The light-emitting element of Example 2 was produced in the same manner as in Example 1 except that the electron transport layer composed of BAlq2 was replaced with the electron transport layer.

Embodiment 3

[0098] In Example 2, the light-emitting element of Example 3 was produced in the same manner as in Example 2 except that the thickness of the electron transport layer composed of BAlq2 was changed to 40 nm.

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Abstract

The present invention provides a light emitting device that comprises a luminescent layer formed of a monomolecular film of quantum dots and has enhanced brightness and luminescence efficiency. A light emitting device 1 comprises at least an anode 3, a hole transport luminescent layer 5 formed of a material containing a hole transport material and quantum dots 11, an electron transport layer 7, and a cathode 4 provided in that order. The light emitting device 1 is constructed so that the hole mobility of the electron transport layer 7 is smaller than that of tris(8-quinolinolato)aluminum complex (Alq3), and, in the hole transport luminescent layer 5, excitons generated in the electron transport layer 7 migrate into the luminescent layer to emit light.

Description

[0001] References to related applications [0002] This application is a patent application claiming priority under Article 4 of the Paris Treaty based on Japanese Patent Application No. 2007-256371 (filed on September 28, 2007). Therefore, this application includes all matters disclosed in the patent application specification, drawings, and the like. technical field [0003] The present invention relates to a light-emitting element, and more specifically, to a light-emitting element including an EL light-emitting layer containing quantum dots. Background technique [0004] An organic electroluminescent element (hereinafter referred to as an organic EL element) is a light-emitting element having a laminated structure in which an organic light-emitting layer is sandwiched between an anode and a cathode, and utilizes holes injected from the anode and electrons injected from the cathode. A self-luminous device that emits light due to recombination in the light-emitting layer. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/14C09K11/06H01L51/50
CPCC09K11/623H01L51/5012C09K11/883H05B33/14C09K11/565H05B33/24H01L51/0081B82Y30/00B82Y20/00H10K85/324H10K50/11H10K50/115
Inventor 赤井智纪下河原匡哉
Owner DAI NIPPON PRINTING CO LTD
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