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Undoped red organic electroluminescent material and preparation method and applications thereof

A reaction and compound technology, applied in the field of organic electroluminescence, can solve problems such as energy matching, phase separation and carrier transport imbalance, increase of non-radiative inactivation process, weakening of fluorescence quantum efficiency, etc. Transport ability, reduced dipole-dipole interaction, effects of cheap raw materials

Inactive Publication Date: 2010-03-03
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with high-performance blue and green luminescent materials, the progress of red electroluminescent materials is obviously lagging behind.
The main reasons are: (1) The energy gap of the red light-emitting material is small, and the non-radiative inactivation of the excited state molecules is relatively easy, thus causing the weakening of the fluorescence quantum efficiency; (2) In the red light material system, the strong π- π interaction or dipole-dipole interaction will lead to strong intermolecular interaction, which will increase the non-radiative inactivation process and reduce the quantum efficiency, that is, the concentration quenching effect
(3) In order to avoid the phenomenon of concentration quenching, doping technology is often used in the preparation of devices, but it brings other problems, such as energy matching between host and guest materials, phase separation and carrier transport imbalance, etc.

Method used

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  • Undoped red organic electroluminescent material and preparation method and applications thereof
  • Undoped red organic electroluminescent material and preparation method and applications thereof
  • Undoped red organic electroluminescent material and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 Preparation and properties of undoped red organic electroluminescent material TP3

[0050] 1. Preparation of 2,4,6-trimethyl-1,3,5-s-triazine (Compound 1)

[0051] Mix 24.6g of acetonitrile (0.6mol) and 27.6g of absolute ethanol (0.2mol) in the three-necked flask, pass hydrogen chloride gas at room temperature until 0.6mol of hydrogen chloride is absorbed, that is, the reaction solution has a weight gain of 14.3g. Stir at room temperature for 16 hours. After completion of the reaction, the crude product was filtered off and dried. After drying, it was added to a vigorously stirred mixture of 50 mL of dichloromethane, 125 mL of water and potassium carbonate (0.6 mol). The organic layer was separated after stirring for 10 minutes. The aqueous solution was extracted twice with 50 mL of dichloromethane (25 mL each). The organic phases were combined and placed in the refrigerator to dry over anhydrous potassium carbonate overnight. Most of the solvent was remo...

Embodiment 2

[0071] Example 2 Preparation of single-layer undoped red electroluminescent device

[0072] This embodiment prepares the undoped red electroluminescent device according to the following method:

[0073] a) Cleaning ITO (indium tin oxide) glass: ultrasonically clean the ITO glass with deionized water, acetone, and ethanol for 15 minutes each, and then treat in a plasma cleaner for 2 minutes;

[0074] b) Spin-coating PEDOT:PSS as a hole injection layer on anodic ITO glass at 4000 rpm, annealed at 200 °C for 5 min in air, and then annealed at 200 °C for 15 min in nitrogen. The thickness is 28nm;

[0075] c) spin-coating the light-emitting layer TP3 on the PEDOT:PSS layer, the concentration of TP3 is 12 mg / mL, the rotation speed is 2000 rpm, and the thickness is 80 nm;

[0076] d) Vacuum evaporation of LiF on the light-emitting layer TP3, rate Thickness 0.5nm;

[0077] e) Cathode Al was vacuum-evaporated on top of LiF with a thickness of 120 nm.

[0078] The structure of the...

Embodiment 3

[0079] Example 3 Preparation of double-layer undoped red electroluminescent device

[0080] This embodiment prepares the undoped red electroluminescent device according to the following method:

[0081] a) Cleaning the ITO glass: ultrasonically clean the ITO glass with deionized water, acetone and ethanol for 15 minutes each, and then treat it in a plasma cleaner for 2 minutes;

[0082] b) Spin-coating PEDOT:PSS as a hole injection layer on anodic ITO glass at 4000 rpm, annealed at 200 °C for 5 min in air, and then annealed at 200 °C for 15 min in nitrogen. The thickness is 28nm;

[0083] c) Spin-coat the light-emitting layer TP3 on the PEDOT:PSS layer, the concentration of TP3 is 9 mg / mL, the rotation speed is 2000 rpm, and the thickness is 40 nm. ;

[0084] d) Vacuum evaporation of electron transport layer Alq on the light-emitting layer TP3 3 (8-hydroxyquinoline aluminum), rate Thickness 30nm;

[0085] e) Alq in the electron transport layer 3 LiF was deposited on to...

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Abstract

The invention discloses an undoped red organic electroluminescent material and a preparation method and applications thereof, wherein the material is a compound with a symmetrical star-like push and pull electronic structure and consists of a triazine group and three phenothiazine groups the N positions of which are connected with alkyls. The material comprises three intramolecular charge transferchannels, thus improving the carrier transmission capability thereof; and the symmetrical star-like structure formed by three dipole moments reduces the intramolecular dipole-dipole mutual effect andeffectively prevents the fluorescent quenching caused by intramolecular cluster. The compound has simple preparation method and low material cost, is easily dissolved in common organic solvents and applicable for being prepared into films by using the spin coating method with lower cost, and is beneficial for the carrier balance in the device and the device efficiency improvement as the compoundcontains the phenothiazine group with hole-transmission capability and the triazine group with teleportation capability when the compound is taken as the light-emitting layer materiel of the undoped red organic electroluminescent devices.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescence, in particular to a non-doped red organic electroluminescence material, a preparation method thereof, and the application of the material in an organic electroluminescence device (OLED). Background technique [0002] In recent years, organic electroluminescence has attracted more and more attention as a display technology with great practical prospects. Due to the advantages of wide viewing angle, fast response, high brightness, low power consumption, and the ability to fabricate flexible displays, OLEDs are considered to be the most favorable competitors in the new generation of display technologies. Nowadays, there are many practical OLED products on the market, such as MP3 players with OLED displays, mobile phones, digital cameras and so on. Nevertheless, organic electroluminescence still suffers from problems such as high fabrication cost and short lifetime. [0003] Orga...

Claims

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Application Information

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IPC IPC(8): C07D417/14C09K11/06H01L51/50H01L51/54
Inventor 肖立新孔胜陈志坚曲波龚旗煌
Owner PEKING UNIV
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