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Indole compound-containing composition and light-emitting device using the composition

A technology for light-emitting elements and compounds, applied in the field of compositions containing indole compounds, can solve the problems of low luminous efficiency and low triplet excitation energy of light-emitting materials, and achieve excellent luminous efficiency, large triplet excitation energy and low LUMO. Effect

Inactive Publication Date: 2010-01-27
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned conjugated polymer is not suitable as a host for light emission having a wavelength shorter than green, because the lowest triplet excitation energy is small (Patent Document 2)
For example, a light-emitting material (Non-Patent Document 1) comprising polyolefin as a conjugated polymer and a triplet light-emitting compound has low luminous efficiency

Method used

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  • Indole compound-containing composition and light-emitting device using the composition
  • Indole compound-containing composition and light-emitting device using the composition
  • Indole compound-containing composition and light-emitting device using the composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] The minimum triplet excitation energy T of the polymer (P-1) represented by the following formula, where n=∞ is an extrapolated value 1 (1 / n=0) is 3.1eV, the absolute value of the energy level E of the lowest unoccupied molecular orbital energy level LUMO (1 / n=0) is 1.4eV, and the minimum dihedral angle is 46°.

[0147]

[0148] (In the formula, n is the aggregation number.)

[0149] Calculation of the parameters is carried out using computational science methods described in the detailed description of the invention. Specifically, using the following repeating unit (M-1) in the polymer (P-1), for the cases of n=1, 2, and 3, the structure was optimized by the F method.

[0150]

[0151] At this time, as the basis function, use 6-31G * . Then, using the same basis function, the energy level of the lowest unoccupied molecular orbital energy level and the lowest triplet excitation energy were calculated through the time-dependent density functional method of the ...

Embodiment 2

[0155] With respect to the THF solution (0.05% by weight) of the phosphorescent compound (MC-1) represented by the following formula (MC-1), the THF solution (about 5 times the weight) of the compound represented by the following formula (C-1) was mixed. 1% by weight). 10 µl of the resulting solution was dropped on a slide glass and air-dried to obtain a solid film. When it was irradiated with ultraviolet rays of 365 nm, green light emission from the phosphorescent compound (MC-1) was confirmed.

[0156]

[0157] The lowest triplet excitation energy T of the compound represented by the above formula (C-1) 1 is 3.3eV, the absolute value of the energy level E of the lowest non-occupied molecular orbital LUMO is 1.5eV.

[0158] It should be noted that the above formula (MC-1) was synthesized based on the method described in WO02 / 066552.

Embodiment 3

[0160] A THF solution (about 1% by weight) of a compound represented by the following formula (C-2) was mixed about 5 times by weight with respect to a THF solution (0.05% by weight) of the phosphorescent compound (MC-1). 10 µl of the resulting solution was dropped on a slide glass and air-dried to obtain a solid film. When it was irradiated with ultraviolet rays of 365 nm, green light emission from the phosphorescent compound (MC-1) was confirmed.

[0161]

[0162] The lowest triplet excitation energy T of the compound represented by the above formula (C-2) 1 is 3.3eV, the absolute value of the energy level E of the lowest unoccupied molecular orbital LUMO is 1.5eV.

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Abstract

Disclosed is a composition containing a compound having an indole ring structure and a phosphorescent compound.

Description

technical field [0001] The present invention relates to a composition containing an indole compound and a light-emitting device obtained by using the composition. Background technique [0002] As a light-emitting material used in the light-emitting layer of a light-emitting element, a compound that exhibits light emission from a triplet excited state (hereinafter sometimes referred to as a "phosphorescent compound") is known. The element used in the light-emitting layer has high luminous efficiency. When a phosphorescent compound is used in a light-emitting layer, a composition obtained by adding the compound to a matrix is ​​generally used as a light-emitting material. Since a thin film can be formed by coating, a polymer such as polyvinylcarbazole is used as a matrix (Patent Document 1). [0003] However, the above compound has a problem that it is difficult to inject electrons because the lowest unoccupied molecular orbital (hereinafter sometimes referred to as "LUMO") i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06H01L51/50C07F15/00
CPCH01L51/0085H01L51/0035H01L51/0072H05B33/14C08G61/124C09K2211/1466C08G2261/5242C08G2261/3241C09K11/06H01L51/5016C09K2211/185H10K85/111H10K85/342H10K85/6572H10K50/11H10K2101/10C07F15/00
Inventor 秋野喜彦
Owner SUMITOMO CHEM CO LTD
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