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Organic electroluminescent compound, a plurality of host materials and organic electroluminescent device comprising the same
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A technology of host materials and compounds, applied in the field of organic electroluminescent compounds, can solve problems such as unsatisfactory, undisclosed specific combinations, etc., and achieve the effects of excellent life characteristics, high power efficiency, and high luminous efficiency
Pending Publication Date: 2022-01-18
ROHM & HAAS ELECTRONICS MATERIALS LLC
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[0004] Korean Patent Application Publication No. 2015-0116776 discloses various host materials comprising compounds in which a nitrogen-containing heteroaryl group is bonded to a carbazole-based moiety and biscarbazole derivatives, but does not disclose the Specific compounds or specific combinations of host materials
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example 1
[0134] Example 1: Preparation of Compound H1-11
[0135]
[0136]Compound 2-1 (8.4g, 24.0mmol), compound 1-2 (10.8g, 26.8mmol), DMAP (4-dimethylaminopyridine) (1.5g, 12.0mmol), CsF (cesium fluoride) ( 9.1 g, 59.9 mmol) and 250 mL of NMP (1-methyl-2-pyrrolidone) were added to the flask, dissolved, and then stirred under reflux for 2 hours. After the reaction is complete, use H 2 O crystallized the mixture, and then separated by column chromatography to obtain compound H1-11 (15.0 g, yield: 86%).
[0137] compound MW M.P. H1-11 732.91 298.5℃
example 2
[0138] Example 2: Preparation of Compound H1-90
[0139]
[0140] 1.) Synthesis of compound 1-1
[0141] 3-Chloro-4-fluorophenylboronic acid (20g, 114mmol), 2-chloro-4,6-diphenyl-1,3,5-triazine (30.7g, 114mmol), tetrakis(triphenylphosphine ) palladium (0) (6.6 g, 5.73 mmol), 2M potassiumcarbonate (39 g, 286 mmol), 570 mL of toluene, 140 mL of ethanol and 140 mL of distilled water were added to the flask, dissolved, and then stirred under reflux for 2 hours. After the reaction was completed, the reaction was quenched with water and the organic layer was extracted with ethyl acetate. After removing remaining moisture with magnesiumsulfate, the residue was dried and separated by column chromatography to obtain Compound 1-1 (32 g, yield: 80%).
[0151] Device Example 3: Production of Green Emitting OLEDs According to the Disclosure
[0152] An OLED was produced in the same manner as in Device Example 1 except that Compound H2-22 was used as the second host of the light emitting layer.
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Abstract
The present disclosure relates to an organic electroluminescent compound represented by formula 1, a plurality of host materials comprising at least one first host compound and at least one second host compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound represented by formula 1, or a specific combination of compounds wherein the first host compound is represented by formula 1, and the second host compound is represented by formula 2, it is possible to provide an organic electroluminescent device having improved driving voltage, luminous efficiency, power efficiency, and / or lifespan characteristics.
Description
technical field [0001] The present disclosure relates to organic electroluminescent compounds, various host materials, and organic electroluminescent devices comprising the same. Background technique [0002] Small-molecule green organic electroluminescent devices (OLEDs) were first developed by Tang et al. at Eastman Kodak in 1987 by using a TPD / ALq3 bilayer consisting of an emissive layer and a charge transport layer. Since then, the development of OLEDs has been rapidly affected and OLEDs have been commercialized. Currently, OLEDs mainly use phosphorescent materials having excellent luminous efficiency in panel realization. OLEDs with high luminous efficiency and / or long lifetime are required for long-time use and high-resolution displays. [0003] In order to enhance luminous efficiency, driving voltage, and / or lifetime, various materials or concepts for organic layers of organic electroluminescent devices have been proposed. However, they are not satisfactory in prac...
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