Triarylamine Charge Transporting Material for Green Phosphorescence
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Solution Overview
Problem
Existing organic electroluminescent elements using phosphorescence emitting materials face issues with high driving voltage, low luminous efficiency, and durability, particularly when emitting green phosphorescence.
Innovation Solution
A charge transporting material with a triarylamine structure fused with an —O— or —S— linking group and containing an aryl or heteroaryl group at the para-position, which is used in the organic electroluminescent element to reduce driving voltage and enhance luminous efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If previously reported charge transporting compounds are used, then the organic electroluminescent element can emit green phosphorescence, but the driving voltage becomes too high
Solution Approach 1:
The patent modifies the molecular structure parameters of charge transporting materials by fusing triarylamine with specific ring structures ( formulas (1)-(3) ), which changes the electronic properties and energy levels of the material, thereby reducing the driving voltage required for green phosphorescence emission while maintaining emission performance
2Illumination intensity
If previously reported charge transporting compounds are used, then the organic electroluminescent element can emit green phosphorescence, but the luminous efficiency becomes low
Solution Approach 1:
The patent employs composite charge transporting materials with specific molecular structures (formulas (1)-(3)) that combine multiple functional groups and ring structures, creating materials with optimized electronic properties that simultaneously achieve high green phosphorescence emission and high luminous efficiency
3Illumination intensity
If previously reported charge transporting compounds are used, then the organic electroluminescent element can emit green phosphorescence, but the durability becomes low
Solution Approach 1:
The patent introduces specific local structural features (formulas (1)-(3)) with particular ring fusion patterns and substituent groups that provide enhanced stability and resistance to degradation at critical molecular sites, thereby improving the overall durability of the organic electroluminescent element while maintaining green phosphorescence emission
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 proposed solution allows for an organic electroluminescent element that can be driven with low voltage while maintaining high luminous efficiency and durability, specifically improving performance for green phosphorescence emission.
Implementation Method 1
by using phosphorescence emitting materials, elements are being enhanced in efficiency
Implementation Method 2
utilize, for light emitting, energy of the exciton generated as a result of recombination of the electron injected from the cathode and the hole injected from the anode
Data Source
AI summary
A charge transporting material comprising a compound represented by any one of the following general formula (1-1) to general formula (1-3):wherein R111 to R114, R121 to R125 and R131 to R135 each independently represent a hydrogen atom or a substituent, and may be bound together to form a ring; L111 to L113 each independently represent O or S; L121 to L123 each independently represent a single bond or a divalent linking group; and Ar111 to Ar113 each independently represent an aryl group or a heteroaryl group.