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(Pentaphenyl)phenyl Group Containing Compound, Polymeric Derivative Thereof And Method For Forming The Same

a technology of pentaphenyl and compound, applied in the field of compound containing pentaphenyl phenyl group, can solve the problems of shortened lifetime, low glass transition temperature, brightness decay, etc., and achieve the effects of improving the optical and electrical properties of polymers, reducing molecular symmetry, and increasing the steric effect of polymers

Inactive Publication Date: 2008-11-27
NAT TAIWAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]One object of the present invention is to introduce a (pentaphenyl)phenyl substituent to an iridium phosphorescent material to have intermolecular energy transfer become intramolecular energy transfer so as to increase efficiency in energy transfer and luminance efficiency. At the same time, by enhancing steric effect, queching effect caused by concentration can be reduced.
[0009]Another object of the present invention is to obtain polymer electroluminescent materials by using 9-[(pentaphenyl)phenyl]carbazole, as a major substance, together with fluorene having a long alkyl side chain and carbazole, being as monomers, to carry out polymerization, using Suzuki coupling and Horner-Wadsworth-Emmons (HWE) reactions. Furthermore, 1,4-bis(2-bromostyryl)benzene (OPV) and benzothiazole are introduced to improved the optical and electrical property of the polymers. In thermal property, the (pentaphenyl)phenyl group side chain structure increases the steric effect of polymers so as to reduce molecular symmetry and reduce molecular chain aggregation to thereby prevent from being over red-shifted in fluorescence. On the other hand, the (pentaphenyl)phenyl group side chain structure makes the rotational degree of freedom decreased. Therefore, the glass transition temperature of the polymer provided by the present invention is higher than that of the general carbazole polymer. The polymer provided by the present invention has excellent thermal stability. Therefore, this present invention does have the economic advantages for industrial applications.

Problems solved by technology

For small molecule dyes or pigments, polymeric light emitting materials, hole injection materials, hole transport materials, the common drawback is that the glass transition temperature is too low.
Since the OEL device produces excess joule heat during operating for a long period of time, the operating temperature of the device generally exceeds the Tg of the material so as to cause the material to recrystallize and thereby to result in brightness decay and shortened lifetime.

Method used

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  • (Pentaphenyl)phenyl Group Containing Compound, Polymeric Derivative Thereof And Method For Forming The Same
  • (Pentaphenyl)phenyl Group Containing Compound, Polymeric Derivative Thereof And Method For Forming The Same
  • (Pentaphenyl)phenyl Group Containing Compound, Polymeric Derivative Thereof And Method For Forming The Same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028]Referring to scheme 1, 5-bromo-2-iodo-pyridine as a starting substance with selective reactivity reacts with Pd(PPh3)4 organic metallic catalyst. At first, the Suzuki coupling reaction between the starting substance and boric acid with different electron-withdrawing group is carried out. Then, the Sonogashira coupling reaction with phenylacetylene is carried out to substitute the bromine atom at the fifth position of the starting substance. Thus, this method can successfully obtain compounds 4˜6 and have ideal yield.

[0029]Referring to scheme 2, the Diels-Alder reaction between the compounds 4˜6 and tetraphenylcyclopentadienone (TPCDO) is carried out. The reaction requires high temperature, about 260° C., and TPCDO is the reaction medium. Thus, no solvent is added. The reaction takes place about 3 hrs to obtain compounds 7˜9 containing a (pentaphenyl)phenyl substituent.

[0030]Referring to scheme 3, in the synthesis of the iridium complex, the method reported by Nonoyama is used ...

example 2

[0042]Generally, vacuum evaporation is utilized to fabricate the OLED devices. In the vacuum evaporation method, compounds are evaporated under vacuum and deposited on the ITO glass. However, the compounds have to sustain high temperature like 300˜400° C. without decomposition or transformation. If the compounds decompose during the evaporation process, the decomposed compounds will contaminate the device to jeopardize the performance of the device. In the present invention, although the device is made by spin coating without direct heating compounds, the external current applied on these compounds during operating or testing generates heat and transfers heat to these compounds. Therefore, the materials used in the OLED devices require thermal stability. If the thermal decomposition temperature (Td) of the material is too low, its application will be limited.

[0043]On the other hand, the glass transition temperature (Tg) of the material also affects the lifetime, efficiency, and chro...

example 4

[0051]This example provides seven polymers derived from a 9-[(pentaphenyl)phenyl]carbazole structure, as shown in the following P1-P7, and a comparison polymer P8. The synthesis of the polymers P1, P2, and P4-P8 utilizes Suzuki coupling reaction. At first, borate or boric acid compound monomer and brominated monomer are dissolved in THF (as the solvent), Pd(PPh3)4 is the catalyst, P(t-Bu)3 is the ligand, K3PO4 is also added, and reflux reaction is carried out for 40 hrs under the reaction temperature of 70° C. Next, triphenylammonium bromide as a terminal group is added and the reaction proceeds for one additional day and then stops. Finally, chloroform is used to extract the crude polymer product. Toluene is used as the elute and the chromatographic column is used to remove salts and heavy metal catalyst. The product is treated by vacuum concentration and then reprecipitated in methanol. Thus, the purified polymer is obtained. The molecular weights and distribution of the polymers ...

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Abstract

The present invention discloses an iridium complex containing a (pentaphenyl)phenyl ligand, having the following general equation:in which G is primary ligand, R′ and R″ are auxiliary ligands. On the other hand, the present invention discloses a compound with a 9-[(pentaphenyl)phenyl]carbazole structure and its polymeric derivative.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention is generally related to a compound containing (pentaphenyl)phenyl group, and more particularly to a compound containing (pentaphenyl)phenyl group, used as an organic display material, and its polymeric derivative and a method for forming the same.[0003]2. Description of the Prior Art[0004]Organic light emitting diode displays, also known as organic electroluminescent displays (referred to as “OEL display”) have advantages of self-emitting, quick response time, wide viewing angle, simple fabricating processes, and being flexible. Luminance mechanism of organic electroluminescence is similar to that of inorganic light emitting diodes. Generally, organic light emitting diodes can be divided into two categories: small molecule organic light emitting diodes and polymer organic light emitting diodes. For small molecule organic light emitting diodes, small molecule dyes or pigments are the major compositi...

Claims

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Application Information

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IPC IPC(8): C09K11/00
CPCC07F15/0033C09K11/06C09K2211/1007C09K2211/1011C09K2211/1029C09K2211/1033C09K2211/1037C09K2211/1088C09K2211/1092C09K2211/1425C09K2211/1433C09K2211/1466C09K2211/185
Inventor HSIEH, KUO-HUANGLEUNG, MAN-KITCHEN, WEN-CHANGKUO, CHAO-HUICHEN, HONG-JUNKE, HSIN-CHUNGKU, CHENG-HSIU
Owner NAT TAIWAN UNIV
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