High-molecular compound containing space charge transfer polymer sensitizer and resonance structure fused ring unit and organic electroluminescent device

A polymer compound and resonance structure technology, applied in electrical components, electrical solid-state devices, semiconductor devices, etc., can solve the problems of reduced fluorescence quantum yield, red shift of luminescent spectrum emission, and large degree of electron cloud delocalization

CN113698523AActive Publication Date: 2021-11-26CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-11-26

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Abstract

The invention provides a high-molecular compound containing a space charge transfer polymer sensitizer and a resonance structure fused ring unit. The high-molecular luminescent material has a structure as shown in a formula (I) and / or a formula (II). Compared with the prior art, the high-molecular compound has the following specific advantages: 1, a donor and an acceptor of a space charge transfer polymer are connected by adopting a non-conjugated structure, the overlapping degree of electron clouds is relatively small, a TADF effect is generated, and triplet excitons can cross to a singlet state in an anti-intersystem manner, and then energy can be transferred to a resonance fused ring unit MR for luminescence through a transfer process to realize utilization of triplet excitons; 2, due to the rigid framework of the resonance fused ring unit MR, non-radiative transition is inhibited, and the photoluminescence quantum efficiency is high; 3, the rigid structure can inhibit molecular excited state vibration relaxation, the recombination energy is small, and the characteristics of narrow spectrum emission and high color purity are acheived.
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Description

technical field

[0001] The invention belongs to the technical field of organic luminescent materials, and in particular relates to a polymer compound containing a space charge transfer polymer sensitizer and a resonance structure condensed ring unit and an organic electroluminescence device. Background technique

[0002] Polymeric light-emitting materials are the basis for the fabrication of low-cost and large-area organic light-emitting diodes (OLEDs) based on solution processing. According to different luminescent mechanisms, polymer luminescent materials can be divided into three types: fluorescent polymers, phosphorescent polymers and thermally activated delayed fluorescence (TADF) polymers. Among them, fluorescent polymers are limited by the spin statistics theory, and the fluorescent unit can only use singlet excitons accounting for 25% of the total number of excitons, so its luminous efficiency is low. Due to the spin-orbit coupling effect of heavy metals, phosphores...

Examples

preparation example Construction

[0089]The present invention also provides a method for preparing the polymer compound containing the space charge transfer polymer sensitizer and the resonance structure condensed ring unit, comprising: in a protective atmosphere, the monomer described in formula (III), the formula The monomer shown in (IV) reacts with the monomer shown in the formula (V) and / or the monomer shown in the formula (VI) through an initiator in the first solvent to obtain a polymer compound; The mol ratio of the monomer shown in (III), the monomer shown in formula (IV) and the monomer shown in formula (V) and / or the monomer shown in formula (VI) is (1-x-y): x:y;

[0090]

[0091] Among them, x, y, Both Sp and Sp are the same as above, and will not be repeated here.

[0092] In a protective atmosphere, the monomer shown in the formula (III), the monomer shown in the formula (IV) and the monomer shown in the formula (V) and / or the monomer shown in the formula (VI) in the first The reaction is ...

Embodiment 1

[0110]

[0111] Under argon atmosphere, add 0.948mmol MD1, 0.050mmol MA1, 0.002mmol MF1 and 0.020mmol AIBN to a 25mL Schlenk bottle, add 10mL tetrahydrofuran (THF) into the bottle, raise the temperature to 50°C, and stir the reaction under argon protection After 48 hours, it was cooled to room temperature, the reaction liquid was poured into acetone, and the precipitated solid was filtered, vacuum-dried, dissolved in dichloromethane, settled in methanol, and vacuum-dried again to obtain the desired polymer compound.

[0112] The polymer compound obtained in Example 1 has a number average molecular weight of 35,700 g / mol and a degree of dispersion (PDI) of 1.78.

Embodiment 2

[0114]

[0115] Under argon atmosphere, add 0.948mmol MD2, 0.050mmol MA2, 0.002mmol MF2 and 0.020mmol AIBN to a 25mL Schlenk bottle, add 10mL tetrahydrofuran (THF) into the bottle, raise the temperature to 50°C, and stir the reaction under argon protection After 48 hours, it was cooled to room temperature, the reaction liquid was poured into acetone, and the precipitated solid was filtered, vacuum-dried, dissolved in dichloromethane, settled in methanol, and vacuum-dried again to obtain the desired polymer compound.

[0116] The polymer compound obtained in Example 2 has a number average molecular weight of 23,500 g / mol and a degree of dispersion (PDI) of 2.01.