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An electroluminescent device, an organic technology, applied in the direction of electric solid devices, electrical components, semiconductor devices, etc., can solve the problem of low light extraction efficiency, achieve high polarizability, high refractive index, and improve light extraction efficiency Effect
Active Publication Date: 2021-01-29
CHANGCHUN HYPERIONS TECH CO LTD
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[0005] In order to solve the problem of low light extraction efficiency caused by total reflection inside the above-mentioned OLED device, the present invention provides an organic electroluminescent device, which adds a covering layer with a high refractive index on the surface of the organic electroluminescent device, which can Effectively avoid total reflection of light at the interface and solve the problem of low light extraction efficiency. According to the present invention, an organic electroluminescent device with greatly improved light extraction efficiency can be obtained
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[0109] Compound Preparation and Characterization
[0110] Description of starting materials, reagents, and characterization equipment:
Embodiment 1
[0124] [Example 1] Synthesis of Compound 1
[0125]
[0126] Add raw material C-1 (33.0g, 140mmol), intermediate A-1 (71.4g, 284mmol), 550mL of toluene solvent into the round bottom flask, and then add Pd(dba) in sequence under nitrogen protection 2 (1.6g, 2.8mmol), tri-tert-butylphosphine (5.6mL of 1M solution in toluene, 5.6mmol), sodium tert-butoxide (40.3g, 420mmol), heated the reactant and stirred at 91°C for 5h. After the reaction, the reactant was cooled to room temperature, 500 mL of toluene was added for extraction, and the organic layer was extracted. Then the organic layer was concentrated, and after concentration, it was recrystallized with toluene:n-hexane (1:1) to obtain compound 1 of the present invention (65.5 g, 81.2%).
[0127] Mass Spectrum m / z: 576.1488 (Theoretical: 576.1546). Theoretical element content (%)C 34 h 20 N 6 o 4 : C, 70.83; H, 3.50; N, 14.58; O, 11.10. Measured element content (%): C, 70.85; H, 3.47; N, 14.56; O, 11.14. The above re...
Embodiment 2
[0131] [Example 2] Synthesis of compound 8
[0132] The raw material C-1 in Example 1 was replaced by an equimolar raw material C-2, and the compound 8 of the present invention (74.4 g, 81.4%) was obtained according to the synthesis method of Example 1.
[0133] Mass Spectrum m / z: 652.1745 (Theoretical: 652.1859). Theoretical element content (%)C 40 h 24 N 6 o 4 : C, 73.61; H, 3.71; N, 12.88; O, 9.81. Measured element content (%): C, 73.65; H, 3.68; N, 12.89; O, 9.79. The above results confirmed that the obtained product was the target product.
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Abstract
The invention provides an organic light-emitting device, and relates to the technical field of organic photoelectricity. The organic light-emitting device comprises a substrate, a first electrode, anorganic matter layer, a second electrode, a first covering layer and a second covering layer, the first covering layer and the second covering layer are located on the outer side of the second electrode, the first covering layer comprises a nitrogen-containing heterocyclic compound, and the second covering layer comprises an organic matter or an inorganic matter. The refractive index of the firstcovering layer material ranges from 1.8 to 2.2, the refractive index of the second covering layer material is larger than that of the first covering layer, and the refractive index meets the formula that n2-n1 is larger than or equal to 0.3. The compounds contained in the two covering layers have higher refractive indexes, so that the light extraction efficiency of the device can be effectively improved; and because the refractive index difference value of the two covering layer materials is large, the microcavity effect is enhanced, the light extraction efficiency can be effectively improved,and the light emitting efficiency of the device is improved. Meanwhile, the introduction of the covering layer can effectively isolate oxygen and moisture in the air, thereby prolonging the service life of the device.
Description
technical field [0001] The invention relates to the field of organic photoelectric technology, in particular to an organic electroluminescent device. Background technique [0002] Organic electroluminescent devices, also known as organic light-emitting diodes (OLED), refer to the phenomenon that organic light-emitting materials are excited by current under the action of an electric field to emit light. Compared with the traditional liquid crystal display, as a new generation of display technology, OLED has the advantages of self-illumination, wide viewing angle, low power consumption, high response rate, full color, etc. It has extremely high research and development value and broad application prospects. [0003] The OLED device structure generally includes a substrate, a first electrode, an organic layer, a second electrode, and a cover layer located on the outer surface of the first electrode or the second electrode. OLED devices can be divided into three types according...
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