Light Emitting Element Metal Complex Luminance Lifetime
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Solution Overview
Problem
Existing light emitting devices do not consistently exhibit sufficient luminance lifetime.
Innovation Solution
A light emitting device comprising a first light emitting layer with a metal complex represented by formula (1) and a second light emitting layer, where the metal complex is either in its pure form or as a crosslinked product, enhancing the luminance lifetime through specific structural and compositional arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional light emitting devices are used, then they can be manufactured with existing technology, but they do not exhibit sufficient luminance lifetime
Solution Approach 1:
The patent employs composite materials by combining a metal complex (emissive component) with a host material in the first light emitting layer, and using a polymer compound with crosslinkable groups in the second light emitting layer. This composite structure enhances both luminance lifetime and performance consistency by integrating materials with complementary functions - the metal complex provides efficient light emission while the host material and crosslinked polymer structure provide stability and durability.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical structure of the metal complex (formula 1) and the polymer compound (formula 2) to optimize emission properties and stability. Specifically, the patent changes the ligand configuration of the metal complex and introduces crosslinkable functional groups into the polymer structure, thereby improving luminance lifetime through controlled chemical parameter modifications.
2Use of energy by moving object
If a metal complex is used in the light emitting layer, then light emission efficiency is improved, but luminance lifetime remains insufficient
Solution Approach 1:
The patent introduces a host material as an intermediary between the metal complex and the environment. The host material mediates the interaction between electrons and the metal complex, facilitating efficient energy transfer while protecting the metal complex from degradation. This intermediary role allows the system to maintain high light emission efficiency while extending luminance lifetime through the host material's stabilizing effect.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves an improved luminance lifetime by utilizing a metal complex with iridium as the central metal and specific ligand configurations, ensuring stability and efficiency in light emission.
Implementation Method 1
a first light emitting layer comprising a metal complex (M01) represented by formula (1)... a second light emitting layer comprising a crosslinked product of a polymer compound comprising a constitutional unit derived from a metal complex (M02)
Implementation Method 2
An organic electroluminescent device (hereinafter also referred to as 'light emitting device') can be suitably used for display and lighting applications
Data Source
AI summary
A light emitting device, comprising an anode, a cathode, a first light emitting layer provided between the anode and the cathode, and a second light emitting layer provided between the anode and the cathode, wherein the first light emitting layer comprises a metal complex represented by formula (1) (wherein M1 represents an iridium atom or the like, n1 represents an integer of 1 or more, n2 represents an integer of 0 or more, n1 + n2 is 2 or 3, ring R1A represents a triazole ring constituted of a nitrogen atom, E1, E11A, E12A, and a carbon atom, ring R2 represents an aromatic hydrocarbon ring or the like, E1, E2, E11A, and E12A each represent a nitrogen atom or the like, R11A and R12A represent an aryl group or the like, R13A represents an aryl group or the like, A1-G1-A2 represents an anionic bidentate ligand, A1 and A2 each represent a nitrogen atom or the like, and G1 represents a single bond or the like).