Organic electroluminescent element

A kind of electroluminescent element, electroluminescent technology

Inactive Publication Date: 2014-02-05
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a monoamine-based material that is effective as a hole-transporting material can be used, the durability against charges is weak in the structure of the monoamine-based material, and the host material has a structure in which carbazoles are not directly connected, so The ionization potential is large, and holes accumulate at the interface between the hole transport material and the host material, which adversely affects the device performance

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0386] The following examples illustrate the present invention in detail, and the present invention is not limited by them.

Synthetic example 1

[0388] (Synthesis of Intermediate 1)

[0389] [chemical formula 84]

[0390]

[0391] Under argon flow, 2-nitro-1,4-dibromobenzene (11.2g, 40mmol), phenylboronic acid (4.9g, 40mmol), and tetrakis(triphenylphosphine)palladium (1.39g, 1.2mmol) were added in sequence , toluene (120 mL), 2M aqueous sodium carbonate solution (60 mL) and heated to reflux for 8 hours.

[0392] After cooling the reaction solution to room temperature, the organic layer was separated, and the organic solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel chromatography to obtain Intermediate 1 (6.6 g, yield 59%). It was identified as intermediate 1 by FD-MS (field desorption mass spectrometry) analysis.

[0393] (Synthesis of Intermediate 2)

[0394] [chemical formula 85]

[0395]

[0396] Under argon flow, Intermediate 1 (6.6g, 23.7mmol), triphenylphosphine (15.6g, 59.3mmol), o-dichlorobenzene (24mL) were sequentially added and heated at 180°C for 8...

Embodiment 1

[0418] (Production of organic EL elements)

[0419] A 25 mm x 75 mm x 1.1 mm glass substrate with an ITO transparent electrode (manufactured by Geomatics) was subjected to ultrasonic cleaning in isopropanol for 5 minutes, and then to UV (ultraviolet) ozone cleaning for 30 minutes.

[0420] Assemble the washed glass substrate with transparent electrode lines on the substrate holder of the vacuum evaporation device, and first vapor-deposit the following electron-accepting Compound (A), A film with a film thickness of 5 nm was formed. On this film A, the following aromatic amine derivative (X1) was vapor-deposited as a first hole transport material to form a first hole transport layer with a film thickness of 120 nm. After forming the first hole transport layer, the following carbazole derivative (H1) was vapor-deposited as a second hole transport material to form a second hole transport layer with a film thickness of 47 nm.

[0421]Compound (B1) as a host for phosphorescence a...

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Abstract

An organic electroluminescent element which is characterized by comprising, between a positive electrode and a negative electrode facing each other, a first organic thin film layer and a second organic thin film layer in this order from the positive electrode side. The organic electroluminescent element is also characterized in that: the first organic thin film layer contains a specific aromatic heterocyclic derivative (A); the second organic thin film layer contains a specific aromatic heterocyclic derivative (B); and the aromatic heterocyclic derivative (A) and the aromatic heterocyclic derivative (B) are different from each other. Consequently, this organic electroluminescent element can be driven at low voltage and has long service life.

Description

technical field [0001] The present invention relates to organic electroluminescent elements. In particular, it relates to an organic electroluminescent device using a compound of the same system having a specific nitrogen-containing aromatic heterocyclic linkage structure. Background technique [0002] When a voltage is applied to an organic electroluminescent element (hereinafter referred to as an organic EL element), holes are injected from the anode and electrons are injected from the cathode into the light emitting layer. Then, in the light-emitting layer, the injected holes recombine with electrons to form excitons. At this time, singlet excitons and triplet excitons are generated at a ratio of 25%:75% by the statistical rule of electron spin. When classified according to the principle of light emission, the fluorescent type uses light emission using singlet excitons, so the internal quantum efficiency of organic EL elements is limited to 25%. On the other hand, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50C09K11/06
CPCH01L51/0072H01L51/5056H01L51/5016H10K85/6572H10K50/11H10K2101/10H10K50/15C09K11/06H10K50/00H10K85/624
Inventor 加藤朋希薮内伸浩佐土贵康
Owner IDEMITSU KOSAN CO LTD
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