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Organometallic complex, light-emitting solid, organic electroluminescent element and organic electroluminescent display

An electroluminescent element and organometallic technology, applied in electroluminescent light sources, platinum group organic compounds, platinum group organic compounds, etc., can solve the problems of narrow selection range, insufficient phosphorescence efficiency, and few strong phosphorescence materials.

Active Publication Date: 2006-05-10
UDC IRELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of using phosphorescent materials, there is a problem that there are very few materials that emit strong phosphorescence at room temperature, and the range of selection of these materials is very narrow
[0008] However, the phosphorescence efficiency (quantum yield of photoluminescence) of this metal complex is insufficient at room temperature, and there is a problem that the phosphorescence efficiency is low in an organic EL device using this metal complex.

Method used

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  • Organometallic complex, light-emitting solid, organic electroluminescent element and organic electroluminescent display
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  • Organometallic complex, light-emitting solid, organic electroluminescent element and organic electroluminescent display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0432] The Pt(dpt)(o2Fph) synthesized in Synthesis Example 1 was made into a thin film (luminescent solid) with a thickness of 50 nm by co-evaporation method on a glass substrate, and it was doped into CBP at 2% according to the vapor deposition rate. According to the following measurement method, with the known PL quantum yield (PL quantum yield: 22%) of the tris(8-hydroxyquinoline) aluminum (Alq3) film as a reference, calculate the PL quantum yield of the film (luminescent solid) Rate (photoluminescence).

[0433] That is, the excitation light (365 nm constant light) from the light source is obliquely irradiated on the thin film sample on the transparent substrate. The PL spectrum of the film is measured by a spectroradiometer (Minolta, CS-1000) 104, and the number of PL photons [P(sample)] is calculated from the PL spectrum conversion. While performing the luminescence measurement, the total intensity of the excitation light transmitted and reflected from the sample is detected...

Embodiment 2-30，30a-c， and comparative Embodiment 1-7

[0436] In addition to changing the organometallic complexes as the luminescent material from Pt(dpt)(o2Fph) to the organometallic complexes listed in Table 6 to Table 8 (synthesized by the above synthesis example), the following 1 Measure the phosphorescence quantum yield of the formed thin film (luminescent solid) under the same conditions. The results are shown in Table 6 to Table 8.

[0437] Luminescent material

[0438] Luminescent material

[0439] Luminescent material

[0440] From the results shown in Table 6 to Table 8, it is obvious that the phosphorescent film made of the organometallic complex of the present invention has a very high phosphorescent emission quantum yield.

Embodiment 31

[0442] Using the obtained organometallic complex Pt(dpt)(o2Fph) as the light-emitting material of the light-emitting layer, a multilayer organic EL device was manufactured. Use water, acetone and isopropanol to clean the glass substrate on which the ITO electrode is attached. Use vacuum vapor deposition equipment (vacuum = 1×10 -4 Pa, substrate temperature = room temperature) 4,4',4"-tris(2-naphthylphenylamino)triphenylamine (2-TNATA) as a positive hole injection layer is formed on the ITO electrode to the thickness The NPD as a positive hole transport layer is then formed on the positive hole injection layer to a thickness of 10 nm. The BCP as a positive hole blocking layer is formed on the light-emitting layer to a thickness of 20 nm. The above-mentioned Alq3 as an electron transport layer is formed on the hole blocking layer to a thickness of 20nm. Then LiF is vapor-deposited on the electron transport layer to a thickness of 0.5nm, and finally aluminum is vapor-deposited to a t...

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Abstract

An object of the present invention is to provide an organic EL element or the like employing the aforementioned organometallic complex, which exhibits phosphorescence-emitting properties, has excellent luminous efficiency, thermal and electrical stability, and long operating life. The properties of the organometallic complex contained in the organic EL element of the present invention include: a metal atom; a three-atom bond to the metal atom through two nitrogen atoms and a carbon atom, and the carbon atom is located between the two nitrogen atoms and a monodentate ligand that performs single-atom coordination with the above-mentioned metal atom through one selected from N atom, O atom and S atom, and the ligand also includes The position has a substituent, or a ring structure substituted by a halogen atom.

Description

[0001] Cross references to related applications [0002] This application is based on and claims the priority of the prior Japanese Patent Application No. 2004-321295 with the filing date of November 4, 2004, and the entire application is incorporated herein by reference. Technical field [0003] This application demonstrates phosphorescence emission, and relates to organic electroluminescence (EL) elements using organometallic complexes or light-emitting solids, which are suitable for use as light-emitting in organic EL elements and light emitters. Materials, color conversion materials, etc. The present invention also relates to an organic EL display using the organic EL element. Background technique [0004] The organic EL element includes one or more thin organic layers between the positive electrode and the negative electrode. When positive holes from the positive electrode and electrons from the negative electrode are injected into the above-mentioned organic layer, the posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F15/00C09K11/06H05B33/14H10K99/00
CPCC07F15/0086C09K11/06C09K2211/1007C09K2211/1011C09K2211/1033C09K2211/1037C09K2211/1044C09K2211/1059C09K2211/185H05B33/14H10K59/38H10K85/346H10K50/11H10K2101/10
Inventor 外山弥佐藤佑猿渡纪男
Owner UDC IRELAND
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