Phosphorescence-emitting composition, and light-emitting element utilizing the composition

A light-emitting element and composition technology, which is applied in the field of light-emitting elements and phosphorescent compositions, can solve the problems of weak luminescence and low luminous efficiency, and achieve the effects of easy hole injection, high luminous efficiency, and excellent luminescence

Inactive Publication Date: 2011-05-18
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, a light-emitting material composed of a conjugated polymer polyfluorene and a triplet light-emitting compound has low luminous efficiency due to weak light emission from the triplet light-emitting compound (Non-Patent Document 1)

Method used

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  • Phosphorescence-emitting composition, and light-emitting element utilizing the composition
  • Phosphorescence-emitting composition, and light-emitting element utilizing the composition
  • Phosphorescence-emitting composition, and light-emitting element utilizing the composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] The following formula:

[0145]

[0146] T of the shown compound (C-1) 1 The energy value is 3.3eV, the absolute value of the LUMO energy level E LUMO is 1.6eV, and the minimum dihedral angle is 41°. The calculation of parameters was performed using the structure of compound (C-1). Specifically, the structure of compound (C-1) was optimized by the HF method. At this time, 6-31g* is used as the basis function. Then, using the same basis function, the value of the LUMO energy level and T 1 energy value. The dihedral angle was calculated from the structure optimized by the HF method. There are two dihedral angles, but only the smallest value is described here.

[0147] In addition, calculate the following formula with computational science methods:

[0148]

[0149] T of the indicated phosphorescent compound (MC-1) 1 The value of the energy turns out to be 2.8eV.

[0150] When a light-emitting device was fabricated using the composition containing the compo...

Embodiment 2

[0152] The following formula:

[0153]

[0154] T of the shown compound (C-2) 1 The energy value is 3.3eV, the absolute value of the HOMO energy level E LUMO is 6.2eV, and the minimum dihedral angle is 55°. The calculation of the parameters was carried out in the same manner as in Example 1 using the structure of the compound (C-2), using computational science methods.

[0155] When a light-emitting device was fabricated using the composition containing the compound (C-2) and the phosphorescent compound (MC-1), it was confirmed that the luminous efficiency was excellent.

Embodiment 3

[0157] The following formula:

[0158]

[0159] T of the shown compound (C-3) 1 The energy value is 3.3eV, the absolute value of the LUMO energy level E LUMO is 1.8eV, and the minimum dihedral angle is 45°. The calculation of the parameters was performed using the structure of the compound (C-3), in the same manner as in Example 1, using computational science methods.

[0160] When a light-emitting device was produced using the composition containing the compound (C-3) and the phosphorescent compound (MC-1), it was confirmed that the luminous efficiency was excellent.

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Abstract

Disclosed is a composition comprising a compound having residues of at least two nitrogenated polycyclic compounds selected from the group consisting of nitrogenated polycyclic compounds represented by formulae (1-1), (1-2), (1-3) and (1-4) [wherein R's independently represent a hydrogen atom or a substituent and may be the same as or different from one another] and a phosphorescence-emitting compound.

Description

technical field [0001] The present invention relates to a phosphorescent composition and a light-emitting device 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. Elements used in the light-emitting layer have high luminous efficiency. When a phosphorescence-emitting compound is used for a light-emitting layer, a composition obtained by adding the compound to a matrix is ​​generally used as a light-emitting material. As a substrate, polyvinylcarbazole is used because a thin film can be formed by coating (Patent Document 1). [0003] However, since the energy level of the lowest unoccupied molecular orbital (hereinafter referred to as "LUMO") of this compound is high, it is difficult to inject electrons. On the other hand, a conjugated po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C07F15/00C08G61/12C08K5/34C08K5/56C08L65/00H01L51/50
CPCC08G61/123C09K2211/1011C08K5/34C08L65/00C09K2211/1029H01L51/0085C09K2211/1007H05B33/14C09K11/06C08G61/124H01L51/0072C08G2261/3241C09K2211/1044H01L51/5016H10K85/342H10K85/6572H10K50/11H10K2101/10
Inventor 秋野喜彦
Owner SUMITOMO CHEM CO LTD
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