OLED Organic Compounds for Hole Transport and Electron Blocking
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Solution Overview
Problem
Organic light emitting display devices face challenges in achieving high efficiency and long lifetime while operating at low voltage, primarily due to inefficient hole and electron transfer and leakage in the light emitting layer.
Innovation Solution
The development of organic compounds with specific structural properties that function as both hole transport and electron blocking agents, allowing for improved recombination efficiency in the light emitting layer by facilitating smooth hole transport and effectively trapping electrons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic compounds are used in the light emitting layer, then the device structure is simple, but the luminous efficiency is low due to inefficient hole and electron transfer
Solution Approach 1:
The patent applies multi-functionality by designing organic compounds that simultaneously perform hole transport and electron blocking functions within the light emitting layer. This eliminates the need for separate dedicated layers, thereby improving luminous efficiency through optimized charge transfer while maintaining relatively simple device structure.
Solution Approach 2:
The patent merges the hole transport function and electron blocking function into a single organic compound material. This combining of functions allows the light emitting layer to achieve both efficient hole transport and effective electron trapping without requiring additional separate functional layers, thus resolving the contradiction between efficiency improvement and structural complexity.
2Productivity
If the light emitting layer is optimized for high efficiency, then luminous efficiency improves, but the device lifetime is reduced due to charge leakage to adjacent layers
Solution Approach 1:
The patent applies local quality by designing the organic compound with specific molecular characteristics that create localized electron trapping sites within the light emitting layer. This local electron blocking capability prevents charge leakage to adjacent layers while maintaining efficient recombination in the bulk of the light emitting layer, thereby simultaneously improving luminous efficiency and extending device lifetime.
3Duration of action of stationary object
If high voltage is applied to achieve long lifetime, then device lifetime improves, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the electrical parameters of the light emitting layer through the use of specialized organic compounds. These compounds alter the energy levels and charge transport characteristics, enabling the device to achieve long lifetime at lower operating voltages by improving charge transfer efficiency and reducing leakage currents, thus resolving the contradiction between lifetime and power consumption.
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 use of these organic compounds in the organic light emitting display device enhances luminous efficiency and extends the device's lifetime by optimizing the recombination of holes and electrons, thereby reducing driving voltage and improving overall performance.
Implementation Method 1
holes injected from an anode and electrons injected from a cathode recombine in a light emitting layer
Implementation Method 2
charges injected into the light emitting layer do not leak to an adjacent layer
Implementation Method 3
holes injected from an anode and electrons injected from a cathode recombine in a light emitting layer to form excitons. The organic light emitting element emits light when the excitons thus formed transit from an unstable excited state to a stable ground state
Data Source
AI summary
The present disclosure relates to organic compounds and an organic light emitting display device using the same and more particularly, to an organic light emitting display in which an organic compound represented by the following Chemical Formula 1 is used for a hole transport layer or an electron blocking layer of the organic light emitting element to easily transport holes injected from an anode to a light emitting layer and suppress the leakage of electrons from the light emitting layer. Therefore, it is possible to provide an organic light emitting display device with high luminous efficiency and long lifetime.