OLED Hole Injecting Layer Using Metal Fluoride Composite
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Solution Overview
Problem
Conventional organic light-emitting devices (OLEDs) face challenges in improving light-emitting efficiency, life span, and reducing power consumption, particularly in achieving high brightness and long life while maintaining low voltage.
Innovation Solution
An organic light-emitting device incorporating a hole injecting layer composed of a three-component mixture including a metal fluoride, an insulator, and a hole injecting organic compound, where the metal fluoride is a Group 1 or Group 2 element and the insulator contains elements like Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, and O, S, Cl, Se, Br, or I, which enhances electrical characteristics and is suitable for all colors, including red, green, blue, and white.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hole injecting materials are used in OLEDs, then the device structure is simple, but the light-emitting efficiency and life span are insufficient
Solution Approach 1:
The patent applies composite materials by formulating the hole injecting layer as a three-component mixture comprising a metal fluoride, an insulator, and a hole injecting organic compound. This composite approach combines the advantages of each material: metal fluoride provides low work function for efficient hole injection, insulator provides high dielectric constant for charge accumulation, and organic compound provides good film-forming properties and charge transport capability, thereby resolving the contradiction between improved reliability and increased complexity.
Solution Approach 2:
The patent employs parameter changes by optimizing the work function and dielectric constant parameters of the hole injecting layer through material selection and composition ratio adjustment. By carefully selecting metal fluorides with appropriate work functions and insulators with suitable dielectric constants, and by optimizing their mixing ratios, the patent achieves improved hole injection efficiency and device stability without excessive complexity.
2Illumination intensity
If higher driving voltage is applied to improve brightness, then the light-emitting efficiency improves, but the power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the electrical parameters of the hole injecting layer, specifically the work function and charge injection efficiency. By selecting metal fluorides with low work functions and combining them with insulators having high dielectric constants, the patent reduces the energy barrier for hole injection, enabling efficient charge injection at lower voltages. This resolves the contradiction by achieving high brightness through improved charge injection efficiency rather than increased voltage, thereby reducing 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 solution results in an OLED with improved driving voltage, light-emitting efficiency, and extended life span, reducing power consumption and maintaining high brightness across various colors.
Implementation Method 1
When a current is applied to the device, the OLED emits light by the recombination of electrons and holes in the organic film
Data Source
AI summary
An organic light-emitting device includes a first electrode; a second electrode; an emissive layer disposed between the first electrode and the second electrode; and a hole injecting layer disposed between the first electrode and the second electrode. The hole injecting layer includes a three-component mixture of a metal fluoride, an insulator, and a hole injecting layer forming organic compound. The metal of the metal fluoride is a Group 1 or Group 2 element. The insulator is a compound made up of an element selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba and B, and an element selected from the group consisting of O, S, Cl, Se, Br and I. The hole injecting layer material provides excellent electrical characteristics, and is suitable for fluorescent and phosphorescent devices of all colors including red, green, blue, and white, and can be used in manufacturing an organic light-emitting device having high efficiency, low voltage, high brightness, and long life span.