Heterocyclic Compound Capping Layer for OLED Light Extraction
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Solution Overview
Problem
Current OLED devices face low light extraction efficiency due to limitations in refractive index of existing capping layer materials, particularly for blue, green, and red light-emitting devices, and the high vapor evaporation temperatures of inorganic materials make them unsuitable for precise mask positioning in the manufacturing process.
Innovation Solution
A heterocyclic compound with heteroatom-substituted fluorene is developed, which can be used in the capping layer, hole transport layer, or electron transport layer of OLED devices, offering a higher refractive index and improved light extraction efficiency, and is synthesized through a condensation reaction with controlled molar ratios and addition of an acid binding agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If inorganic materials are used as capping layer materials to improve refractive index, then light extraction efficiency is improved, but the high vapor evaporation temperature causes poor positioning accuracy in mask evaporation
Solution Approach 1:
The patent changes the material parameter from inorganic to organic, which fundamentally alters the evaporation temperature characteristic. The organic capping layer material evaporates at lower temperatures, enabling precise mask positioning while maintaining the ability to improve light extraction efficiency through molecular structure design
Solution Approach 2:
The patent develops composite organic capping layer materials with specific molecular structures (containing heteroatoms like N, O, S) that combine appropriate refractive index properties with suitable evaporation characteristics, achieving both high light extraction efficiency and manufacturing precision
2Illumination intensity
If inorganic materials are used as capping layer materials, then refractive index can be increased, but the materials are damaged by sputtering method
Solution Approach 1:
The patent changes the material composition from inorganic to organic, which fundamentally alters the material's response to deposition methods. Organic materials are less susceptible to damage from sputtering and other deposition processes, while still achieving the desired refractive index through molecular structure design
Solution Approach 2:
The organic capping layer materials are designed to be deposited as thin films that perform their light extraction function effectively without requiring extreme durability, allowing for simpler deposition processes that avoid material damage
3Ease of manufacture
If conventional capping layer materials are used, then manufacturing process is simple, but light extraction efficiency is insufficient
Solution Approach 1:
The patent optimizes molecular structure parameters (introducing heteroatoms, adjusting aromatic ring configurations) to enhance refractive index and light extraction efficiency, while maintaining compatibility with existing simple deposition processes
Solution Approach 2:
The patent designs composite organic molecules that integrate light extraction functionality with processability, achieving enhanced performance without complicating the manufacturing process
4Illumination intensity
If current capping layer materials are used, then fabrication process is complicated, but light extraction efficiency is improved
Solution Approach 1:
The patent adjusts material parameters to achieve appropriate refractive index and film formation properties, enabling effective light extraction with straightforward deposition processes rather than complex multi-step fabrication
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 heterocyclic compound enhances light extraction efficiency across various wavelengths, particularly for blue light-emitting devices, leading to increased luminous efficiency and extended device lifetime, while its thermal and chemical stability ensures robust performance in OLED devices.
Implementation Method 1
According to the principle of optical absorption and refraction, the refractive index of the surface capping layer material should be as high as possible
Implementation Method 2
synthesized through a condensation reaction with controlled molar ratios
Data Source
AI summary
A heterocyclic compound containing heteroatom substituted fluorene is provided in the present disclosure. The heterocyclic compound includes a structure:Y1 is selected from O or S; X1, X2, X3, X4, X5, X6, X7, and X8 are independently selected from CRa or N; X9, X10, X11, X12, X13, X14, X15, X16, X17, X18, X19, X20, X21, X22, X23, and X24 are independently selected from CR1 or N; Ra is independently selected from hydrogen, deuterium, tritium, halogen, nitrile, cyano, nitro, hydroxyl, carbonyl, ester, carboxyl, imide, amide, C1-C20 alkoxy, C1-C20 alkyl, C3-C20 cycloalkyl, C2-C20 alkenyl, C3-C20 cycloalkenyl, silyl, boron, phosphine oxide, phosphine, sulfonyl, amine, C6-C30 aryl, C3-C30 heteroaryl, or a ring structure; Y2, and Y3 are independently selected from O, S or NR2; Ar1 and Ar2 are independently selected from aryl or heteroaryl; and R1 and R2 are independently selected from hydrogen, deuterium, C1-C20 alkyl, C6-C30 aryl, or C3-C30 heteroaryl.