A-D-A type nano-corner lattice with thermal activation delayed fluorescence properties and preparation method and application thereof

A technology of A-D-A and thermal activation delay, applied in chemical instruments and methods, organic chemistry, luminescent materials, etc., can solve the problems of short working life of devices, unsatisfactory requirements, poor chemical stability, etc., and achieve electronic energy level adjustable, large Rigidity, low cost effect

Inactive Publication Date: 2019-08-02
NANJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

At present, in the research and development of blue light TADF materials, there are the following shortcomings: 1. Poor stability, including thermal, electrochemical and spectral stability; 2. Short working life of the device
For example: J.Y.Lee et al [S.Y.Lee, T.Yasuda, Y.S.Yang, Q.Zhang and C.Adachi.Angew.Chem., Int.Ed., 2014, 126, 6520.] reported in 2014 that the day EQE for blue OLED max =37%, but its Tg is only 155°C, and its chemical stability is poor; L.Duan et al. 145.] reported in 2016 that after the introduction of tert-butyl, the stability of the molecule increased, and the initial brightness was 500cd / m 2 Device lifetime T 50 =770h, but this cannot meet the needs of the current blue OLED

Method used

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  • A-D-A type nano-corner lattice with thermal activation delayed fluorescence properties and preparation method and application thereof
  • A-D-A type nano-corner lattice with thermal activation delayed fluorescence properties and preparation method and application thereof
  • A-D-A type nano-corner lattice with thermal activation delayed fluorescence properties and preparation method and application thereof

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preparation example Construction

[0054] The present invention also discloses a preparation method of A-D-A type nano cutaway lattice with thermally activated delayed fluorescence properties, the method comprises the following steps:

[0055] S1: to Ar 1 The group is borated, and the brominated fluorenone compound is prepared into a fluorenyl tertiary alcohol by using the Grignard reaction;

[0056] S2: Using the SuZuKi reaction, the borated Ar 1 The compound is coupled with the fluorenyl tertiary alcohol obtained in the S1 step to prepare a compound with Ar 1 The tertiary alcohol compound of the electron donor, as a ring-closing precursor;

[0057] S3: the ring-closing precursor Ar obtained in the step S2 1 For tertiary alcohol compounds, the Friedel-Crafts ring closure reaction is carried out under the environment of normal temperature and organic acid to prepare nano-corner-cut lattices;

[0058] S4: The nano-cornered lattice obtained in the step S3 is subjected to an aromatic nucleophilic reaction with...

Embodiment 6

[0088] All spin-coating and annealing processes were performed in air atmosphere. Before spin coating, the ITO substrates were cleaned as follows: in each detergent, ultrapure H 2 Ultrasound in O (twice), acetone, ethanol for 10 minutes; UV-O 3 Irradiate for more than 15 minutes. PEDOT:PSS was dissolved in ultrapure H at a ratio of 1:1 wt%. 2 O, and spin-coated on a clean ITO substrate at 4000 rpm for 30 s and annealed at 150 °C for 10 min. in N 2 After cooling for 5 minutes under ambient conditions, on the PEDOT:PSS layer, spin-coat a 10 mg / mL DTrz-Cz-Grid toluene solution at a speed of 2200 rpm to form a light-emitting layer. The spin-coating time is 30 seconds, and annealed at 100°C for 10 minutes. , and use N 2 After flow cooling for 5 minutes, use vapor deposition equipment (SE-4260, ALS Technology, Japan) to form TmPyPb (50nm), LiF (1nm) and Al (120nm) on the upper layer of the light-emitting layer by vacuum deposition, and the pressure of vapor deposition 4 Pa, it ...

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Abstract

The invention discloses an A-D-A type nano-corner lattice with thermal activation delayed fluorescence properties and a preparation method and the application of the A-D-A type nano-corner lattice with the thermal activation delayed fluorescence properties. The nano-corner lattice is based on fluorene or diazafluorene and has a rigid geometric structure. A-D-A type nano-corner lattice molecules exhibit cyclic characteristics and unique and excellent TADF characteristics; the A-D-A type nano-corner lattice is cheap in raw materials, easy in preparation, mild in reaction conditions and unique inperformances and high in thermal and electrochemical stability and spectral stability; the materials are novel in structure and excellent in performances and can be synthesized by an aromatic nucleophilic substitution reaction, the synthesis method is simple and the yield is high; an organic electroluminescent device can be prepared by a solution processing method and taken as a light-emitting layer material, so that the A-D-A type nano-corner lattice has the advantages of high luminous efficiency, low efficiency roll-off and capability of effectively reducing the turn-on voltage and the like. The A-D-A type nano-corner lattice disclosed by the invention is expected to become a new generation of new practical organic molecular optoelectronic materials, and has a very good application prospect in the fields of the organic electroluminescent device and the like.

Description

technical field [0001] The invention relates to an A-D-A type nano cutaway lattice with heat-activated delayed fluorescence properties and a preparation method and application thereof, which can be used in the technical field of organic semiconductor materials. Background technique [0002] In the past three decades, significant progress has been made in the development of organic light-emitting diodes (OLEDs), which have a wide range of applications, such as lighting, flat panel displays, and flexible devices. The light-emitting properties of organic light-emitting materials, which can be easily tuned by molecular structure design, have attracted great interest and offer a wide range of advanced applications in the fields of electroluminescence, organic laser, sensors and bioimaging. The light-emitting properties include the color of light emission, strength and longevity. [0003] Organic luminescence is the radiative inactivation of excitons from an excited state to a gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D487/08C09K11/06H01L51/50H01L51/54
CPCC07D487/08C09K11/06C09K2211/1007C09K2211/1029C09K2211/1059H10K85/654H10K85/6572H10K50/115H10K50/00
Inventor 解令海谢松林俞志涛冯全友谭克升郑孝军张宏梅黄维
Owner NANJING UNIV OF POSTS & TELECOMM
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