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Organic electroluminescent device

An electroluminescent and organic technology, applied in the field of organic electroluminescent devices, can solve the problems of inability to meet production requirements, low efficiency, and unstable performance of phosphorescent devices.

Active Publication Date: 2017-06-27
KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the theoretical maximum internal quantum efficiency of fluorescent materials is only 25%, and the efficiency is extremely low; although the theoretical maximum internal quantum efficiency of phosphorescent materials can reach 100%, the performance of phosphorescent devices is unstable, and deep blue is extremely difficult to achieve. In addition, phosphorescent materials The heavy metals such as Ir and Pt used are expensive, resulting in high cost of phosphorescent materials; thermally activated sensitized fluorescent materials have the advantages of fluorescent materials and phosphorescent materials, but the disadvantage is that thermally activated sensitized fluorescent devices have efficiency roll-off phenomenon, and The main material TADF has a single type, which cannot meet the production needs
[0006] Doping types commonly used in phosphorescent OLED light-emitting layers: The commonly used doping types are conventional hosts (such as CBP) and phosphorescent dyes, but because the excitons are the triplet state of the host and are transferred to the phosphorescent triplet state through the short-range Dexter, this leads to The doping concentration of the phosphorescent material is relatively high (>10wt%), because the high doping concentration can reduce the distance between the host and the guest, and promote the complete transfer of energy. The materials are all precious metal materials, and the higher phosphorescent doping concentration increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131]

[0132] Synthesize the compound shown in formula (1-1): TTM (1.81 mmol), 2,3,6,7-tetracarbazolylcarbazole (9.0 mmol), anhydrous Cs 2 CO 3 (2.9 mmol), and a mixture of DMF (20 mL) was stirred at 160°C for 2.5 hours. The reacted mixture was cooled to room temperature, the product was filtered with 1M concentrated hydrochloric acid, and purified by suction filtration, and then the crude product was purified by column chromatography (petroleum ether: dichloromethane = 5:1 v / v) to obtain formula (1-1) , yield 40%.

[0133] The molecular weight obtained by mass spectrometry: 1402.96.

[0134] The relative molecular mass percentage of each element obtained by elemental analysis: C: 71.06; H: 3.74; Cl: 20.22; N: 4.99.

Embodiment 2

[0136] Synthesis of compounds of the structure shown in formula (1-2): The reactant 2,3,6,7-tetracarbazolylcarbazole is replaced by (3,6-di-tert-butyl)-2,3,6,7-tetra Carbazole-carbazole, through the same synthesis method as in Example 1, the compound with the structure shown in formula (1-2) was obtained with a yield of 39%.

[0137] The molecular weight obtained by mass spectrometry: 1835.77.

[0138] The relative molecular mass percentage of each element obtained by elemental analysis: C: 74.59; H: 6.15; Cl: 15.45; N: 3.81.

Embodiment 3

[0140] Synthesis of compounds of the structure shown in formula (1-3): The reactant 2,3,6,7-tetracarbazolylcarbazole is replaced by (3,6-dimethyl ether)-2,3,6,7-tetra Carbazole-carbazole, through the same synthesis method as in Example 1, the compound with the structure shown in formula (1-3) was obtained with a yield of 35%.

[0141] The molecular weight obtained by mass spectrometry: 1626.22.

[0142] The relative molecular mass percentage of each element obtained by elemental analysis: C: 66.43; H: 3.96; Cl: 17.43; N: 4.30; O: 7.87.

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Abstract

The invention discloses an organic electroluminescent device. The device comprises a light emitting layer. The light emitting layer comprises a main body material and light emitting dye doped in the main body material. The main body material is a thermal activation delayed fluorescence material. The light emitting dye is the organic free radical light emitting material. According to the invention, the delayed fluorescence material is used for replacing the traditional fluorescence main body material, and the organic free radical light emitting materials serves as the objective material, so excellent energy transmission can be achieved; driving voltage of the device is reduced; and light emitting efficiency of the device is improved.

Description

technical field [0001] The invention belongs to the technical field of flat panel display, and in particular relates to an organic electroluminescence device. Background technique [0002] The light-emitting layer of an organic electroluminescent device is generally composed of a host material doped with a dye. The traditional double-host light-emitting layer is: a double-host doped fluorescent or phosphorescent dye. The host material of this double-host light-emitting layer does not have a thermally delayed fluorescence effect. The dye also has no thermally delayed fluorescence properties. [0003] Under electro-excitation conditions, organic electroluminescent devices will produce 25% singlet states and 75% triplet states. Traditional fluorescent materials can only utilize 25% of the singlet excitons due to spin prohibition, so the external quantum efficiency is only limited to within 5%. Almost all triplet excitons can only be lost as heat. To improve the efficiency of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/654H10K50/121
Inventor 段炼宾正杨刘嵩赵菲
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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