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Organic electroluminescent device based on iridium-containing organic complex as electroluminescent material

An electroluminescent device and organic compound technology, applied in the field of organic electroluminescent devices, can solve the problems of reduced device efficiency and lifespan, easy decomposition of luminescent materials, increased device driving voltage, etc. Extraction effect, effect of reducing driving voltage

Inactive Publication Date: 2021-07-16
JIANGSU SUNERA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Iridium-containing organic complexes are doped in traditional single-host materials. Since the single-host materials cannot achieve a good balance between electrons and holes, excitons are easily trapped in the electron-blocking / light-emitting layer or hole-blocking / light-emitting layer. Interfacial recombination leads to charge aggregation, high exciton density, and easy exciton-pole quenching; at the same time, due to the existence of a large number of excitons at the interface, the energy diffuses to the electron blocking or hole blocking layer, making exciton energy loss
Ultimately resulting in reduced device efficiency and lifetime
Moreover, due to the high triplet-singlet energy level of the traditional host material, the recombination of excitons on the host material requires a higher energy gap, which increases the driving voltage of the device. At the same time, due to the existence of high-energy excitons The luminescent material is prone to decomposition, which reduces the lifetime of the device

Method used

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  • Organic electroluminescent device based on iridium-containing organic complex as electroluminescent material
  • Organic electroluminescent device based on iridium-containing organic complex as electroluminescent material
  • Organic electroluminescent device based on iridium-containing organic complex as electroluminescent material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Synthesis Example 1: Synthesis of Compound D-2:

[0089]

[0090] Add 2.0mmol of intermediate A and 5.0mmol of intermediate B-1 into the reaction flask, add 50ml of ethanol, and reflux for 24 hours under nitrogen protection. During the reaction, solids are precipitated. After the reaction, filter, and the obtained solids are passed through the column and washed. The solvent removal ratio is petroleum ether:dichloromethane=3:1, and a yellow-green solid is obtained with a purity of 98.6%.

[0091] Elemental Analysis: Theoretical; C, 58.33; H, 3.31; Ir, 25.23; N, 11.03; O, 2.10. Found; C, 58.29; H, 3.33; Ir, 25.26; N, 11.01; O, 2.11. Proton NMR spectrum: 1H NMR (500MHz, Chloroform-d) δ8.65(ddd,3H),8.56(ddd,4H),8.09(d,1H),7.78(dd,1H),7.67(td,1H), 7.64-7.55(m,5H),7.42(d,1H),7.26-7.11(m,6H),2.53(d,3H).

Embodiment 2

[0092] Synthesis Example 2: Synthesis of Compound D-9:

[0093]

[0094] The preparation method of compound D-9 is the same as that in Synthesis Example 1, except that raw material B-7 is replaced by raw material B-1, and the purity is 98.2%.

[0095] Elemental Analysis: Theoretical; C, 62.03; H, 3.67; Ir, 22.56; N, 9.86; O, 1.88. Found; C, 62.01; H, 3.68; Ir, 22.57; N, 9.87; Proton NMR spectrum: 1H NMR (500MHz, Chloroform-d) δ8.57(dt, 4H), 8.51(d, 1H), 8.09(d, 1H), 7.93 (dd, 2H), 7.64–7.55(m, 5H ),7.47–7.39(m,3H),7.39–7.32(m,1H),7.32–7.26(m,3H),7.25–7.11(m,5H),2.53(d,3H),2.47(d,3H ).

Embodiment 3

[0096] Synthesis Example 3: Synthesis of Compound D-10:

[0097]

[0098] The preparation method of compound D-10 is the same as in Synthesis Example 1, except that intermediate A-5 is used to replace intermediate A, and intermediate B-8 is used to replace intermediate B-1, with a purity of 98.5%.

[0099] Elemental Analysis: Theoretical; C, 65.97; H, 4.31; Ir, 19.55; N, 8.55; O, 1.63. Found; C, 65.94; H, 4.30; Ir, 19.57; N, 8.57; O, 1.62. Proton NMR: 1H NMR (500MHz, Chloroform-d) δ8.97(s,2H),8.64–8.56(m,3H),8.42–8.38(m,2H),7.95(d,1H),7.61–7.54 (m,2H),7.54–7.46(m,6H),7.43(d,1H),7.41–7.29(m,6H), 7.24(dq,1H),7.15(ddq,1H),2.58–2.48(m ,15H),2.39–2.35(m,3H).

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Abstract

The invention relates to an organic electroluminescent device based on an iridium-containing organic complex as a luminescent material. A host material comprises a first organic compound and a second organic compound, and the difference between the singlet state energy level and the triplet state energy level of the first organic compound is not greater than 0.2 eV; the singlet state energy level of the second organic compound is more than 0.1 eV greater than the singlet state energy level of the first organic compound, and the triplet state energy level of the second organic compound is more than 0.1 eV greater than the triplet state energy level of the first organic compound; the first organic compound and the second organic compound have different carrier transport characteristics; the guest doped material is an iridium-containing organic complex, the singlet state energy level of the guest doped material is lower than that of the first organic compound, and the triplet state energy level of the guest material is lower than that of the first organic compound. The phosphorescent organic electroluminescent device prepared by the method has the characteristics of high efficiency, narrow FWHM and long service life.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to an organic electroluminescent device based on an iridium-containing organic complex as a light-emitting material. 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 fr...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/342H10K50/11H10K2101/40H10K50/12
Inventor 叶中华吴秀芹张兆超
Owner JIANGSU SUNERA TECH CO LTD
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