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A red phosphorescent organic electroluminescent device

A red phosphorescence and luminescence technology, which is applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problem of low oxidation stability of the host material, improve the utilization rate of excitons, improve the efficiency and life, and reduce the triplet state -Effect of triplet annihilation

Active Publication Date: 2019-03-29
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

[0006] The technical problem to be solved by the present invention is that the red phosphorescent organic electroluminescent device has fewer types of host materials in the prior art, and the existing host materials have low oxidation stability

Method used

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  • A red phosphorescent organic electroluminescent device
  • A red phosphorescent organic electroluminescent device
  • A red phosphorescent organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Synthesis of compounds of structure shown in formula (1-1): under nitrogen range, 3,6-dibromo-9-fluorenone (5mmol), phenoxazine (18mmol), Pd 2 (dba) 3 (0.8mmol), NaOtBu (30mmol) and tBu 3 P·HBF 4 (0.8 mmol) was put into 100 mL of toluene and stirred overnight at a temperature of 105°C. The reaction was quenched by adding 10 mL of cold water to the mixture. After the mixture was cooled to room temperature, it was vacuum filtered, followed by purification by column chromatography to obtain the product with the structure shown in formula (1-1), and the product was dried in vacuum. Yield: 80%.

[0067] The molecular weight obtained by mass spectrometry: 542.58.

[0068] The relative molecular mass percentages of each element obtained by elemental analysis: C: 81.90%; H: 4.09%; N: 5.16%; O: 8.85%.

Embodiment 2

[0070] Synthetic compound of structure shown in formula (1-2): reactant phenoxazine is replaced by phenothiazine, through the same synthetic method as Synthetic Example 1, the compound of structure shown in formula (1-2) is obtained, productive rate 91% .

[0071] The molecular weight obtained by mass spectrometry: 574.71.

[0072] The relative molecular mass percentages of each element obtained by elemental analysis: C: 77.32%; H: 3.86%; N: 4.87%; O: 2.78%; S, 11.16%.

Embodiment 3

[0074] Synthetic compound of structure shown in formula (1-3): the reactant phenoxazine is replaced by 9,9-dimethylacridine, through the same synthetic method as in Synthesis Example 1, the structure shown in formula (1-3) is obtained Compound, yield 87%.

[0075] The molecular weight obtained by mass spectrometry: 594.74.

[0076] The relative molecular mass percentages of each element obtained by elemental analysis: C: 86.84%; H: 5.76%; N: 4.71%; O: 2.69%.

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Abstract

The invention discloses a red phosphorescent organic electroluminescence device, which comprises a light-emitting layer, and is characterized in that the material of the light-emitting layer includes a host material and a red phosphorescent dye doped in the host material, and the host material has the formula I. One of the compounds of formula II or formula III, formula III, wherein, in formula I and formula II, D is an electron-donating group; in formula III, R 1‑5 One of them is a cyano group, two are hydrogen groups, and the other two are the same or different electron-donating groups. In the red phosphorescent organic electroluminescent device of the present invention, the TADF material of D-A-D type fluorenone group, dibenzothiophene sulfone group or phthalonitrile group is used as the host material for red phosphorescence Light-emitting layer, such devices can improve the efficiency and lifetime of the device, and reduce the driving voltage of the device.

Description

technical field [0001] The invention belongs to the field of organic electroluminescent devices, in particular to a red phosphorescent organic electroluminescent device whose luminescent layer adopts a novel host material. Background technique [0002] Organic electroluminescent devices have attracted widespread attention due to their thin body, large area, full curing, and flexibility, and their great potential in solid-state lighting sources and liquid crystal backlights has become a research hotspot. [0003] As early as the 1950s, Bernanose.A et al. started research on organic electroluminescent devices (OLEDs). The material initially studied was an anthracene single wafer. Due to the problem of the large thickness of a single wafer, the required driving voltage is very high. Until 1987, Deng Qingyun (C.W.Tang) and Vanslyke of Eastman Kodak Company of the United States reported that the structure was: ITO / Diamine / Alq 3 / Mg:Ag organic small molecule electroluminescence...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/54
CPCH10K71/13
Inventor 段炼张云阁刘嵩赵菲
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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