OLED Doped Electron Transport Layer Driving Voltage
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Solution Overview
Problem
Large-sized organic light emitting displays with higher brightness face increased driving voltage and power consumption, necessitating improved electron and hole transport at the organic light emitting diode interface.
Innovation Solution
Incorporating a doped electron transport layer with C60 and organic n-type impurities like pyronine B or dicarbocyanine iodide, along with specific layer configurations and materials in the organic light emitting diode, to enhance electron transport and reduce driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the size of organic light emitting display is increased to achieve higher brightness, then the emission intensity is improved, but the driving voltage and power consumption increase
Solution Approach 1:
The patent changes the chemical composition parameters of the electron transport layer by doping C60 with organic n-type impurities (pyronine B or dicarbocyanine iodide). This parameter change modifies the electrical properties of the layer, enabling better electron transport efficiency and lower driving voltage, thus reducing power consumption while maintaining high brightness
Solution Approach 2:
The patent creates a composite material system by combining C60 (fullerene) with organic n-type impurities to form a doped electron transport layer. This composite structure leverages the electron-accepting properties of C60 and the n-type doping effects to achieve superior electron transport characteristics, resolving the contradiction between high brightness and low power consumption
2Use of energy by stationary object
If the driving voltage is reduced to lower power consumption, then the energy efficiency is improved, but the electron and hole transport capability must be enhanced
Solution Approach 1:
The patent modifies the electrical parameters of the electron transport layer through doping with organic n-type impurities. This changes the charge carrier concentration and mobility parameters, enabling efficient electron transport at lower voltages without compromising the transport capability
Solution Approach 2:
The doped C60 layer acts as an intermediary between the emitting layer and the cathode, facilitating smooth electron transport. The organic n-type impurities serve as mediators that enhance the electron injection and transport processes, ensuring reliable electron supply to the emitting layer even at reduced driving voltages
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 solution results in lower driving voltage and higher emission efficiency, thereby reducing power consumption in organic light emitting displays.
Implementation Method 1
an electron transport layer which comprises C60 and in which an organic n-type impurity is doped
Data Source
AI summary
An organic light emitting diode that can improve a driving voltage and emission efficiency includes a first electrode, an organic layer formed on the first electrode and including an emitting layer and an electron transport layer that is doped with an organic n-type impurity, and a second electrode formed on the organic layer. The electron transport layer is made of C60. An organic light emitting display includes the organic light emitting diode.