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Electroluminescent material of high efficiency rare-earth organic ligand and its preparing method

An electroluminescent material and rare earth technology, applied in luminescent materials, electroluminescent light sources, electric light sources, etc., can solve the problems of unsatisfactory device stability, cost reduction, few and other problems, and achieve excellent brightness and luminous spectrum stability. Effect

Inactive Publication Date: 2005-03-02
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the application of rare earth electroluminescent complexes, there are still some problems, such as Eu(III) complexes with a brightness of 100cd / m 2 Few devices have an external quantum efficiency of 1%; and the stability of this type of device is not ideal; the neutral ligands in this type of rare earth complexes that have been reported are difficult to synthesize, which is not conducive to reducing costs

Method used

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  • Electroluminescent material of high efficiency rare-earth organic ligand and its preparing method
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  • Electroluminescent material of high efficiency rare-earth organic ligand and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 (DBM) 3 Preparation of Eu(bpyO):

[0026]

[0027] Dissolve DBM (dibenzoylacetone) (336.8mg, 1.5mmol) in ethanol (15ml), add 2M NaOH (0.75ml, 1.5mmol) and react at 50-60°C for 1 hour, then add EuCl 3 The aqueous solution (0.25mol / L, 2ml) was reacted at 50-60°C for 1 hour, and the obtained precipitate was filtered and washed with water and dissolved in tetrahydrofuran (15ml). mmol) was dissolved in tetrahydrofuran (3ml) and added to the above solution, and refluxed at 50-60°C for 4 hours. The solution was evaporated to dryness and washed with ethanol to obtain a powder product.

Embodiment 2

[0028] Example 2 (TTA) 3 Preparation of Eu(bpyO):

[0029]

[0030] Dissolve TTA (trifluoroacetylthiophene acetone) (333.3mg, 1.5mmol) in ethanol (15ml), add 2M NaOH (0.75ml, 1.5mmol) and react at 60-75°C for 1 hour, then add EuCl 3 Aqueous solution (0.25mol / L, 2ml), reacted at 60-75°C for 1 hour, dissolved monooxy-2,2'-bipyridine (86.1mg, 0.5mmol) in ethanol (3ml) and added to the reaction system After refluxing at 50-75°C for 30 minutes, a precipitate was obtained. The precipitate was washed with water and ethanol, and then recrystallized to obtain a single crystal.

Embodiment 3

[0031] Example 3 (DBM) 3 Preparation of Er(bpy0):

[0032]

[0033] Dissolve DBM (336.8mg, 1.5mmol) in ethanol (15ml), add 2M NaOH (0.75ml, 1.5mmol) and react at 50-65°C for 1 hour, then add ErCl 3 The aqueous solution (0.25mol / L, 2mol) was reacted at 55-65°C for 1 hour, and the obtained precipitate was filtered and washed with water. In tetrahydrofuran, monooxygenated-2,2'-bipyridine (86.1mg, 0.5mmol) was dissolved in Tetrahydrofuran was then added to the above solution and refluxed at 50-65°C for 4 hours. The solution was evaporated to dryness and washed with ethanol to obtain a powdery product.

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Abstract

The present invention relates to one kind of excellent electroluminescent organic RE material, and the material has the structure of (L1)3Ln(L2), where, L1 is beta-diketone ligand, Ln is Eu, Tb, Er and other RE ion, and L2 is 2, 2'-bipyridine N-oxide (bpyO). The present invention creates the application of bpyO as neutral RE ligand in efficient organic electroluminescent device.

Description

technical field [0001] The invention belongs to the technical field of electroluminescence materials, and in particular relates to a kind of rare earth organic complex electroluminescence materials and a preparation method thereof. Background technique [0002] As organic electroluminescent materials, rare earth organic complexes have a wide range of applications in the field of organic electroluminescent devices. First of all, the luminescence of rare earth complexes comes from the transition of electrons between the energy levels of the 4f layer of rare earth (Ln) ions. 60nm or more),; the excitation energy of the Ln ion in the rare earth complex comes from the triplet energy of the β-diketone, and the internal quantum efficiency of the device can be 100% theoretically, while the theoretical maximum quantum efficiency of general organic fluorescent small molecules and polymers Efficiency cannot break through 25%. [0003] PR 3+ 、Nd 3+ 、Sm 3+ 、Eu 3+ , Tb 3+ 、Dy 3+ 、...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06H05B33/00
Inventor 黄维朱旭辉王立洪
Owner FUDAN UNIV
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