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Electroluminescent device, and display device comprising the same

A technology for electroluminescent devices and light-emitting particles, which is applied in the fields of electric solid devices, electrical components, semiconductor devices, etc., can solve problems such as exciton quenching, and achieve the effect of reducing driving voltage and leakage current, and improving luminous efficiency.

Active Publication Date: 2019-07-12
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in order to improve quantum efficiency, excitons can be confined in the emission layer, but when the excitons are not confined in the emission layer due to various factors, it can cause problems such as exciton quenching

Method used

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  • Electroluminescent device, and display device comprising the same
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  • Electroluminescent device, and display device comprising the same

Examples

Experimental program
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Embodiment 1

[0146] An ITO layer was deposited on a glass substrate, and an organic material represented by Chemical Formula 1 was deposited thereon to provide a hole injection layer, and a bicarbazole-based compound (Samsung SDI Co., bicarbazole represented by Chemical Formula 9) was deposited thereon. azole compound) to provide a hole transport layer. The obtained hole transport layer had a thickness of about 52 nm.

[0147] Separately, red quantum dots (InP) and a hydrophilic surfactant were mixed, and mercaptohexanol was attached to the surface of the red quantum dots as a hydrophilic ligand. In this case, a thiol group (—SH) contained in mercaptohexanol is chemically bonded to the surface of the red quantum dot. Then, the red quantum dots attached with the hydrophilic ligand were dispersed in isopropyl alcohol (IPA) to prepare a composition for an emission layer.

[0148] The prepared composition for an emission layer was coated on the hole transport layer and dried under a nitrogen...

Embodiment 2

[0151] According to the same procedure as in Example 1, an electroluminescent device (ITO / Chemical Formula 1 / Chemical Formula 9 / Red QD / triaryltriazine-based compound: Liq(1: 1) / Liq / Al), except that methanol was used as the hydrophilic organic solvent instead of isopropanol, and the thickness of the hole transport layer altered by methanol during preparation of the emissive layer was about 48 nm.

Embodiment 3

[0153] According to the same procedure as in Example 1, an electroluminescent device (ITO / Chemical Formula 1 / Chemical Formula 9 / red QD / triaryltriazine-based compound: Liq(1: 1) / Liq / Al), except that ethanol was used as the hydrophilic organic solvent instead of isopropanol, and the thickness of the hole transport layer altered by ethanol during the preparation of the emissive layer was about 45 nm.

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Abstract

An electroluminescent device and a display device includes the same are disclosed. The electroluminescent device includes a first electrode; a hole transport layer disposed on the first electrode andincluding a first organic material having a conjugated structure; an emission layer disposed directly on the hole transport layer and including a plurality of light emitting particles; an electron transport layer disposed on the emission layer; and a second electrode disposed on the electron transport layer, wherein at least one of the light emitting particles includes a core and a hydrophilic ligand attached to a surface of the core, wherein the hole transport layer has a first thickness and a second thickness at any two point locations, and the first thickness and the second thickness satisfy Equation 1.Equation 1 is described in the detailed description.

Description

[0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2017-0175348 filed with the Korean Intellectual Property Office on December 19, 2017 and Korean Patent Application No. 10-2018 filed with the Korean Intellectual Property Office on November 22, 2018 - Priority and benefit of 0145252, the entire contents of which are incorporated herein by reference. technical field [0003] An electroluminescent device and a display device including the same are disclosed. Background technique [0004] Quantum dots are nanocrystalline semiconductor materials with diameters less than or equal to about 10 nm that exhibit quantum confinement effects. Quantum dots generate more intense light in a narrow wavelength region than commonly used phosphors. Quantum dots emit light when excited electrons transition from the conduction band to the valence band, and even in the same material, the wavelength changes depending on the particle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/00H10K50/125H10K50/15H10K50/00H10K85/633H10K85/654H10K85/6572H10K50/12H10K50/115H10K50/16
Inventor 丁大荣韩文奎金泰亨李相陈张银珠
Owner SAMSUNG ELECTRONICS CO LTD