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An electroluminescent device based on boron-containing organic compounds

A technology of electroluminescent devices and organic compounds, which is applied in the field of long-life organic electroluminescent devices and high efficiency, and can solve the problems of efficiency roll-off, difficult exciton utilization, high fluorescence radiation efficiency, and reduction of material color purity. Achieve the effect of improving efficiency and reducing exciton quenching effect

Active Publication Date: 2020-06-12
JIANGSU SUNERA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although theoretically TADF materials can achieve 100% exciton utilization, there are actually the following problems: (1) The T1 and S1 states of the designed molecules have strong CT characteristics, and the very small S1-T1 state energy gap, although it can A high T1→S1 state exciton conversion rate is achieved through the TADF process, but at the same time it leads to a low S1 state radiative transition rate. Therefore, it is difficult to achieve both (or simultaneously) high exciton utilization efficiency and high fluorescence radiation efficiency;
[0007] (2) Due to the current use of TADF materials with D-A, D-A-D or A-D-A structures, due to their greater molecular flexibility, the configuration of molecules in the ground state and excited state changes greatly, and the half-maximum width (FWHM) of the spectrum of the material is too large. Large, resulting in a reduction in the color purity of the material;
[0008] (3) Even if doped devices have been used to alleviate the T-exciton concentration quenching effect, the efficiency of most TADF materials has a serious roll-off at high current densities

Method used

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  • An electroluminescent device based on boron-containing organic compounds
  • An electroluminescent device based on boron-containing organic compounds
  • An electroluminescent device based on boron-containing organic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] The structure of the organic electroluminescent device prepared in Example 1 is as follows: figure 1 As shown, the specific preparation process of the device is as follows:

[0114] Clean the ITO anode layer 2 on the transparent glass substrate layer 1, ultrasonically clean it with deionized water, acetone, and ethanol for 30 minutes each, and then treat it in a plasma cleaner for 2 minutes; dry the ITO glass substrate and place it in a vacuum In the cavity, the vacuum degree is less than 1*10 -6 Torr, on the ITO anode layer 2, a mixture of HT1 and P1 with a film thickness of 10 nm is evaporated, the mass ratio of HT1 and P1 is 97:3, and this layer is the hole injection layer 3; then, HT1 with a thickness of 50 nm is evaporated, and the layer As the hole transport layer 4; then vapor-deposit 20nm-thick EB1, which serves as the electron blocking layer 5; further, vapor-deposit a 25nm light-emitting layer 6, wherein the light-emitting layer includes a host material and a...

Embodiment 2～21

[0116] The preparation methods of Examples 2-21 are similar to those of Example 1, and the selection of specific materials is shown in Table 1.

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Abstract

The invention relates to an electroluminescent device based on a boron-containing organic compound, wherein the host material comprises a first organic compound and a second organic compound, and the difference between the singlet energy level and the triplet energy level of the first organic compound is not more than 0.2 eV; the singlet energy level of the second organic compound is greater than that of the first organic compound by more than 0.1eV, and the triplet energy level of the second organic compound is greater than that of the first organic compound by more than 0.1eV; and the first organic compound and the second organic compound have different carrier transport characteristics; wherein the guest material is an organic compound containing boron atoms, and the singlet energy level of the guest material is lower than that of the first organic compound, The triplet energy level of the guest material is lower than the singlet energy level of the first organic compound. The organic electroluminescent device prepared by this method has the characteristics of high efficiency and long life.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to an organic electroluminescent device with high efficiency and long life. Background technique [0002] Organic light emitting diodes (OLEDs) have been actively researched and developed. The simplest basic structure of an organic electroluminescent device consists of a light emitting layer sandwiched between opposing cathode and anode. Organic electroluminescent devices are considered to be the next generation of flat panel display materials and have attracted widespread attention due to their ultra-thin, ultra-light weight, fast response to input signals, and low-voltage DC drive. [0003] It is generally believed that organic electroluminescent devices have the following light-emitting mechanism: when a voltage is applied between electrodes sandwiching a light-emitting layer, electrons injected from the anode and holes injected from the cathode recombine in the light-emi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54H10K99/00
CPCH10K85/60H10K50/12H10K2101/30H10K85/658H10K85/626H10K85/633H10K85/6572H10K50/11H10K85/322H10K50/15H10K50/16H10K50/171H10K2101/10H10K2101/40
Inventor 李崇叶中华张兆超
Owner JIANGSU SUNERA TECH CO LTD
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