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Luminescent polymer containing boron/sulfur (selenium, tellurium) hybrid condensed ring unit and electroluminescent device thereof

A technology of polymer compounds and condensed rings, which is applied in the fields of electrical solid device, semiconductor/solid state device manufacturing, electrical components, etc. The effect of peak width, relaxation reduction, and high device efficiency

Active Publication Date: 2021-01-15
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this D-A structure shows a large Stokes shift due to the vibrational relaxation of its excited state, and the luminescence spectrum is wide, and the half-maximum width (FWHM) is generally 70-100nm, resulting in low color purity. In practical applications It is often necessary to use a filter or construct an optical microcavity to improve the color purity, but this will lead to a decrease in the external quantum efficiency of the device or a complicated device structure.

Method used

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  • Luminescent polymer containing boron/sulfur (selenium, tellurium) hybrid condensed ring unit and electroluminescent device thereof
  • Luminescent polymer containing boron/sulfur (selenium, tellurium) hybrid condensed ring unit and electroluminescent device thereof
  • Luminescent polymer containing boron/sulfur (selenium, tellurium) hybrid condensed ring unit and electroluminescent device thereof

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preparation example Construction

[0155]The present invention also provides a method for preparing a light-emitting polymer compound containing boron / sulfur (selenium, tellurium) hybrid fused ring units as described above, comprising the following steps:

[0156] (i) under an inert atmosphere, the monomer of structure shown in formula (Z) is mixed with initiator A and solvent A1, reacts under protective gas atmosphere, then cools, settles in solvent A2, filters, obtains formula ( Ⅰ) The polymer shown.

[0157] The reaction time is preferably 40-120°C; more preferably 50-110°C; the reaction time is preferably 8-72 hours; more preferably 10-60 hours; the cooling is preferably cooling to room temperature. The present invention does not limit the specific operation of the sedimentation and filtration, as long as those skilled in the art are familiar with it.

[0158] Or under an inert atmosphere, mix the monomer with the structure shown in formula (Z) with initiator B, catalyst B, ligand B and solvent B1, react u...

Embodiment 1

[0194] The reaction formula is as follows:

[0195]

[0196] Under argon atmosphere, weigh M in a 10mL Schlenk bottle 2 -1 and azobisisobutyronitrile (AIBN), add 2.5mL tetrahydrofuran (THF) into the bottle, raise the temperature to 65°C, stir and react under argon protection for 48 hours, then cool to room temperature, pour the reaction solution into acetone The precipitated solid was filtered and vacuum-dried to obtain the desired polymer.

[0197] Statistics and characterization were performed on the polymer compound prepared in Example 1 of the present invention.

[0198] For PSS-TB: Feeding is M 2 -1 (0.91mmol) and AIBN (0.018mmol), the yield is 51%, the number average molecular weight of the polymer is 13,600g / mol, the weight average molecular weight is 26,100g / mol, and the degree of dispersion (PDI) is 1.92.

Embodiment 2

[0200] The reaction formula is as follows:

[0201]

[0202] Under argon atmosphere, weigh M in a 10mL Schlenk bottle 2 -2 and ethyl α-bromoisobutyrate, take 2.5mL N,N-dimethylformamide (DMF) into the bottle, stir to make it fully dissolved, add N,N,N',N,'N "-Pentamethyldiethylenetriamine (PMDETA). The reaction system was frozen in liquid nitrogen for 7 minutes, vacuumized for 4 minutes, and then filled with nitrogen, and then the reaction system was placed in a water bath at 25 ° C. The system was thawed and then put into liquid nitrogen to freeze, and the above operation was repeated three times. Weighed cuprous bromide and added it to the reaction system and reacted at 60°C for 4 hours. After the reaction was completed, the reaction was quenched with liquid nitrogen, and the copper salt was removed by column separation. After the solution was concentrated, it was poured into acetone, and the precipitated solid was filtered and vacuum-dried to obtain the desired polymer....

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Abstract

The invention provides a luminescent polymer compound containing a boron / sulfur (selenium, tellurium) hybrid condensed ring unit. The luminescent polymer compound has a structure shown in a formula (I), a formula (II) or a formula (III). A boron / sulfur (selenium, tellurium) hybrid fused ring unit is adopted as a light emitting unit, HOMO and LUMO separation is achieved through the resonance effectbetween boron atoms and sulfur (selenium, tellurium) atoms, and small delta EST and TADF effects are achieved. The boron / sulfur (selenium, tellurium) hybrid fused ring unit has a rigid skeleton structure, and the relaxation degree of an excited state structure can be reduced so that a relatively narrow half-peak width is realized. In addition, a hole transport unit and / or an electron transport unit can be introduced into the side chain of the polymer so that the polymer has good carrier transport capability, and high device efficiency is realized. When the polymer is used as a light-emittinglayer of a solution processing device, narrow electroluminescent half-peak width and high external quantum efficiency of the device can be realized without an optical filter and a micro-cavity structure.

Description

technical field [0001] The invention relates to the field of organic light-emitting materials, in particular to a light-emitting polymer compound containing boron / sulfur (selenium, tellurium) hybrid condensed ring units, a preparation method thereof and an organic electroluminescent device. Background technique [0002] Organic light-emitting devices (OLEDs) are usually composed of a cathode, an anode, and an organic layer inserted between the cathode and the anode, that is, the device is composed of a transparent ITO anode, a hole injection layer (TIL), a hole transport layer (HTL), Light emitting layer (EL), hole blocking layer (HBL), electron transport layer (ETL), electron injection layer (EIL) and cathode are formed, and 1~2 organic layers can be omitted as required. The mechanism of action is to form a voltage between the two electrodes, one side injects electrons from the cathode, and the other side injects holes from the anode, the electrons and holes recombine in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F112/14C08F212/08C08F212/14C09K11/06H01L51/54H01L51/50
CPCC08F112/30C08F212/08C08F212/26C09K11/06C09K2211/1491C09K2211/1466C09K2211/1483C09K2211/1475C09K2211/145C09K2211/1458C09K2211/1433C09K2211/1416H10K85/141H10K85/151H10K50/11C08F212/30
Inventor 王利祥邵世洋陈凡赵磊王淑萌王兴东吕剑虹
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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