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Polymer, display panel and display device

A technology for display panels and polymers, applied in the directions of luminescent materials, chemical instruments and methods, electric solid devices, etc., to achieve the effects of improving solubility, weakening charge transfer, and increasing energy levels

Active Publication Date: 2021-03-12
WUHAN TIANMA MICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are more and more reported carbazole polymer-based TADF materials, there are still few materials with high quantum efficiency.

Method used

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  • Polymer, display panel and display device
  • Polymer, display panel and display device
  • Polymer, display panel and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Synthesis of Polymer M1

[0103] The synthetic route of polymer M1 is shown below.

[0104]

[0105] The synthesis steps of polymer M1 are as follows:

[0106]

[0107] In a 200ml stuffy tank, sequentially add compound A (5.12, 20mmol), compound B (9.14g, 20mmol), anhydrous toluene 100ml and BBr 3 (10g, 40mmol), start stirring, heat up to 120°C and stir for 12h. After the reaction is over, slowly add 70ml of ice water to quench, then add dichloromethane (100ml×3) to extract the reaction solution, and then use saturated brine (100ml ×2) Washing, liquid separation, drying, filtration, spin-drying of the filtrate, and recrystallization using toluene / ethanol to obtain white solid C with a yield of 80%.

[0108] MALDI-TOF: 604.99

[0109] 1 H NMR(400MHz,C):δ7.81(s,3H),7.66(s,2H),7.36(s,3H),7.30(d,J=12.2Hz,2H),4.15(s,2H), 1.73(s,2H),1.29(d,J=27.9Hz,10H),0.89(s,3H).

[0110] 13 C NMR (100MHz, CDCl 3 ): δ167.29(s), 143.65(s), 140.34(s), 135.67(s), 134.81(s), 133.8...

Embodiment 2

[0122]The electroluminescent properties of the exemplary polymeric materials M1, M2, M3 and M4 described herein were simulated using Gaussian software.

[0123] figure 2 with image 3 The HOMO and LUMO energy level diagrams of exemplary polymer M1 of the present invention are shown. It can be clearly seen from the figure that the HOMO and LUMO of the polymer molecule are respectively arranged on the donor unit and the acceptor unit, which realizes the complete separation of HOMO and LUMO, which helps to reduce the energy difference between systems △E ST , so as to improve the inverse intersystem crossing ability.

[0124] Table 1 Parameters of four representative polymers

[0125]

Embodiment 3

[0127] Taking M1 as an example, it is used as a fluorescent dopant (guest material), and the classic polymer material PVK is used as the host material, and the doped device structure is designed:

[0128] ITO (100 nm) / PEDOT:PSS (60 nm) / PVK:M1 (40 nm, 5%) / TmPyPb (50 nm) / LiF (0.5 nm) / Al (100 nm).

[0129] Similarly, the design comparison device structure is as follows:

[0130] ITO (100 nm) / PEDOT:PSS (60 nm) / PVK:BCzVBi (40 nm, 5%) / TmPyPb (50 nm) / LiF (0.5 nm) / Al (100 nm).

[0131] Fabrication of OLED devices

[0132] The structure of the OLED device is as Image 6 As shown, the brief description of its production process is as follows: put the substrate 1 into a rotary washing and drying machine, first wash it with deionized water and flush it with nitrogen, and then treat it with ultraviolet light for 20 minutes to completely remove the residual oil on the surface and improve the anode 2 (the material is ITO) work function, using a combination of high and low speed, two-way s...

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Abstract

The invention belongs to the field of OLED technology and provides a polymer having a structure shown in formula (I), wherein R 1 and R 2 Respectively selected from C1-C20 alkyl, C3-C20 cycloalkyl, C1-C20 alkoxy, substituted or unsubstituted aryl or heteroaryl; L is selected from single bond, phenyl, naphthyl, pyridyl, Pyrimidinyl, pyrazinyl; R 3 selected from substituted or unsubstituted aryl and heteroaryl; R 4 Alkyl or alkoxy groups selected from C4-C20; n≥4. The polymer of the invention contains a diboracyclic carbazole structure and has TADF characteristics. When it is used in an organic light-emitting device, it can use triplet excitons that are forbidden by traditional fluorescent molecular transitions to emit light, thereby improving device efficiency. At the same time, the carbazole polymer-based TADF material itself has bipolar characteristics. As the host or guest material of the light-emitting layer, it can greatly improve the transport capacity of the two types of carriers and improve the carrier balance, improve the fluorescence quantum efficiency and reduce the device Voltage.

Description

technical field [0001] The present invention relates to the technical field of organic electroluminescent materials, in particular to a polymer with thermally activated delayed fluorescence (TADF) performance and a diboracyclocarbazole compound as a monomer, and a display panel comprising the polymer and display device. Background technique [0002] As a new type of luminescent material, polymer electroluminescent materials have incomparable advantages over other materials, such as light weight, flexibility, and the ability to form large-area thin films. Polymer light-emitting devices (PLEDs) using polymer electroluminescent materials have low driving voltage, high luminous efficiency, and can emit fluorescence of different colors. The response speed is fast (microsecond level), and the luminous intensity is proportional to the current. At present, the polymer electroluminescent polymer materials widely researched and commonly used mainly include the following categories: p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G61/12C09K11/06H01L51/50H01L51/54
CPCC09K11/06C08G61/124C08G2261/124C08G2261/3241C08G2261/411C09K2211/1491H10K85/151H10K50/121
Inventor 汪奎张正川
Owner WUHAN TIANMA MICRO ELECTRONICS CO LTD
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