OLED Hole Transporting Material Anisotropic Mobility
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Solution Overview
Problem
Current hole transporting materials for OLEDs face issues with solubility, leading to poor MASK cleaning and excessive device voltage, and high lateral mobility causing crosstalk between pixels.
Innovation Solution
A hole transporting material with a structure incorporating a saturated six-membered carbon ring and benzene rings with non-hydrogen substituents, providing a suitable mobility rate and solubility for effective MASK cleaning without crosstalk, using a specific solvent system like NMP, ketones, or furans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If commercially available hole transporting materials with high longitudinal mobility are used, then hole transport efficiency is improved, but lateral mobility becomes too high causing crosstalk between adjacent pixels
Solution Approach 1:
The patent applies local quality by creating anisotropic hole mobility through specific molecular structure design. The compound structure with saturated six-membered carbon rings and substituted phenylene groups creates directional charge transport properties, allowing high longitudinal mobility for efficient hole transport while suppressing lateral mobility to prevent crosstalk between adjacent pixels
Solution Approach 2:
The patent changes the chemical structure parameters of hole transporting materials by introducing saturated six-membered carbon rings and specific substituent groups (R1-R10) at defined positions. These structural parameter changes fundamentally alter the charge transport characteristics, achieving the desired balance between longitudinal and lateral mobility rates
2Use of energy by moving object
If hole transporting materials with low solubility are used, then device voltage is reduced, but MASK cleaning efficiency deteriorates
Solution Approach 1:
The patent changes the chemical parameters of hole transporting materials by incorporating saturated six-membered carbon rings and specific substituent groups that modify both electrical and solubility properties. These parameter changes achieve a balanced state where the material maintains acceptable device voltage while gaining improved solubility for effective MASK cleaning in mass production
3Ease of manufacture
If hole transporting materials with high solubility are used, then MASK cleaning efficiency is improved, but lateral mobility becomes too high causing crosstalk
Solution Approach 1:
The patent applies local quality by designing the molecular structure to create directional charge transport anisotropy. The specific arrangement of saturated six-membered carbon rings and substituted phenylene groups in the compound structure enables high longitudinal mobility for efficient hole transport while simultaneously suppressing lateral mobility to prevent crosstalk, regardless of the material's solubility level
Solution Approach 2:
The patent employs composite material design by combining multiple structural elements (saturated six-membered carbon rings, phenylene groups, and various substituent groups R1-R10) into a unified hole transporting compound. This composite structure achieves the dual objective of controlling charge transport properties while maintaining appropriate solubility characteristics
Data Source
AI summary
The present invention relates to a hole transporting material having a structure of formula (I). The present invention provides a hole transporting material having at least one saturated six-membered carbon ring and benzene ring(s) having non-hydrogen substituent(s) in the formula and being capable of obtaining a suitable mobility rate without occurrence of crosstalk between pixels; and the hole transporting material provided by the present invention is capable of satisfying the requirements on MASK cleaning in terms of solubility (NMP solvent).