OLED Charge Generation Layer Naphthalocyanine Intermediate
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Solution Overview
Problem
Organic light-emitting devices (OLEDs) face challenges in achieving high luminous density while maintaining a long service life due to increased stress from high current and luminous density, and existing Charge Generation Layers (CGLs) suffer from absorption losses and voltage drops, which affect efficiency and longevity.
Innovation Solution
An organic light-emitting device structure incorporating a charge carrier-generating layer stack with a naphthalocyanine derivative intermediate layer, which enhances charge separation and reduces absorption losses by displacing long-wave absorptions from the visible to the infrared range, thereby increasing efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If inorganic materials or conventional organic materials are used for p-doping in CGLs, then charge carrier generation is achieved, but absorption losses occur in the visible spectral range and voltage drops increase
Solution Approach 1:
The patent changes the optical parameters of the intermediate layer by using naphthalocyanine derivatives, which have their absorption bands shifted to the infrared range. This parameter change eliminates absorption losses in the visible spectral range while maintaining the charge separation function, directly resolving the contradiction between energy loss and device reliability
Solution Approach 2:
The patent employs a composite structure consisting of an electron-transporting layer, an intermediate layer with naphthalocyanine derivative, and a hole-transporting layer. This composite material system combines the advantages of each layer to achieve both low absorption losses and stable charge carrier generation, improving both energy efficiency and service life
2Illumination intensity
If higher current is injected to increase luminous density, then emitted luminous density increases, but stress on the OLED increases and service life is shortened
Solution Approach 1:
The intermediate layer with naphthalocyanine derivative acts as an intermediary between the electron-transporting and hole-transporting layers. It facilitates efficient charge separation and reduces voltage drops, enabling the OLED to achieve high luminous density with lower operating stress, thereby extending service life while maintaining high illumination intensity
3Productivity
If a Charge Generation Layer is used to stack multiple OLEDs, then luminous density and service life are improved, but voltage drop across the CGL increases
Solution Approach 1:
The patent changes the electrical parameters of the intermediate layer by selecting materials with appropriate energy levels and low resistance. The naphthalocyanine derivative provides optimal charge transport properties that minimize voltage drops while maintaining high charge separation efficiency, enabling efficient stacking of multiple OLEDs with reduced energy 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 naphthalocyanine derivatives in the intermediate layer of the charge carrier-generating layer stack reduces absorption losses in the visible spectral range, leading to increased OLED efficiency and extended service life without compromising stability, allowing for higher luminous density and reduced voltage drops.
Implementation Method 1
a charge carrier-generating layer stack on the first organic functional layer stack, a second organic functional layer stack on the charge carrier-generating layer stack... the at least one intermediate layer comprises a naphthalocyanine derivative
Implementation Method 2
reduces absorption losses by displacing long-wave absorptions from the visible to the infrared range
Data Source
AI summary
Disclosed is an organic light-emitting, component which comprises a substrate, a first electrode on the substrate, a first organic functional layer stack on the first electrode, a charge carrier-generating layer stack on the first organic functional layer stack, a second organic functional layer stack on the charge carrier-generating layer stack, and a second electrode on the second organic functional layer stack. The charge carrier-generating layer stack comprises at least one hole-transporting layer, one electron-transporting layer and one intermediate layer, wherein the at least one intermediate layer comprises a naphthalocyanine derivative.