Hole Transporting Material for Organic EL Devices
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Solution Overview
Problem
In organic electroluminescence devices, there is a need for a hole transporting material that maintains high efficiency and long service life while allowing for control of light path length without increasing driving voltage, especially when the thickness of the hole transporting layer is increased, and requires excellent affinity with acceptor materials for enhanced hole injection.
Innovation Solution
A compound represented by a specific general formula is used as a hole transporting material, featuring a heteroaryl-substituted amine derivative that exhibits high mobility and excellent affinity with acceptor materials, allowing for efficient hole injection and maintaining device performance across varying layer thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thickness of the hole transporting layer is increased to control light path length, then light extraction efficiency is improved, but driving voltage increases
Solution Approach 1:
The patent changes the chemical structure parameters of the hole transporting material by introducing specific heteroaryl groups and substituents, which alters the electrical and optical properties of the material, enabling it to maintain low driving voltage even at increased layer thickness
Solution Approach 2:
The patent employs composite material design by combining heteroaryl groups with amine derivatives to create a hole transporting material with optimized properties that simultaneously achieve low driving voltage and high light extraction efficiency at increased thickness
2Productivity
If a hole transporting material with high mobility is used to maintain low driving voltage at increased thickness, then device efficiency is improved, but affinity with acceptor materials may be reduced
Solution Approach 1:
The patent applies local quality by designing specific functional groups (heteroaryl and amine) at different positions of the molecular structure to independently satisfy high mobility requirements and strong acceptor material affinity requirements
Solution Approach 2:
The patent combines heteroaryl groups known for high mobility with amine derivatives known for good affinity with acceptor materials, creating a composite molecular structure that achieves both high device efficiency and reliable hole injection
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 compound ensures high efficiency and long service life of the organic electroluminescence device by maintaining low driving voltage even with increased layer thickness and enhances hole injection properties, making it suitable for both phosphorescent and fluorescent devices.
Implementation Method 1
a hole transporting material that maintains high efficiency and long service life while allowing for control of light path length without increasing driving voltage
Implementation Method 2
requires excellent affinity with acceptor materials for enhanced hole injection
Implementation Method 3
An organic EL device is a self-luminescence device utilizing the principle that a fluorescent substance emits light with recombination energy of holes injected from an anode and electrons injected from a cathode
Data Source
AI summary
An organic EL device that has a high efficiency and a long service life, an electronic apparatus containing the organic EL device, and a compound capable of providing the organic EL device. The compound is specifically represented by the following general formula (1): wherein in the general formula (1), Ar1 represents an organic group A represented by the following general formula (A-1); Ar2 represents the organic group A or an organic group B represented by the following general formula (B-1); and Ar3 represents the organic group B or an organic group C represented by the following general formula (C-1), provided that in the case where both Ar1 and Ar2 are the organic groups A, the organic groups A may be the same as or different from each other, in the general formula (A-1), R1 and R2 each represent a hydrogen atom, an alkyl group or an aryl group, and R1 and R2 may be bonded to each other to form a hydrocarbon ring; R3 to R6 each represent an alkyl group, a cycloalkyl group or an aryl group; and a, b, c and d each independently represent an integer of from 0 to 2, provided that R3 and R4 may be bonded to each other to form a hydrocarbon ring; and in the case where a or b is 2, adjacent groups of R3 or adjacent groups of R4 may be bonded to each other to form a hydrocarbon ring, in the general formula (B-1), Ar4 and Ar5 each represent an arylene group; Ar6 represents an aryl group; R7 to R9 each represent an alkyl group, a cycloalkyl group or an aryl group; e, f and g each represent an integer of from 0 to 2; and h and i each represent 0 or 1, provided that R7 to R9 may be bonded to each other to form a hydrocarbon ring; and in the case where e, f or g is 2, adjacent groups of R7, adjacent groups of R8 or adjacent groups of R9 may be bonded to each other to form a hydrocarbon ring, in the general formula (C-1), Ar7 represents an aryl group; R10 represents an alkyl group, a cycloalkyl group or an aryl group; and j represents an integer of from 0 to 2, provided that in the case where j is 2, adjacent groups of R10 may be bonded to each other to form a hydrocarbon ring.