Hole Transporting Compound for OLED Cost Reduction
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Solution Overview
Problem
Organic light emitting diode (OLED) devices are costly due to the high expense of light emitting compounds, which make up 40-50% of the light emitting layer, and there is a need for materials that maintain optoelectronic properties while reducing production costs.
Innovation Solution
Development of a compound that can function as a hole transporter in the light emitting layer, allowing for a reduction in the amount of expensive light emitting compounds needed, by incorporating a compound of general formula (I) into the OLED structure, which enables efficient hole transport and maintains device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting compounds are used in high amounts (40-50% wt) to maintain optoelectronic properties, then device performance is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent introduces a hole transporting material as an intermediary substance in the light emitting layer. This material mediates between the expensive light emitting compound and the device structure, enabling reduced light emitting compound concentration (to 5-20% wt) while maintaining hole transport functionality and overall device performance through its charge transport capability
Solution Approach 2:
The hole transporting material performs multiple functions: it transports holes through the light emitting layer, enables charge balance, and allows reduction of light emitting compound concentration. This multi-functionality resolves the contradiction by providing the necessary charge transport without requiring high concentrations of expensive light emitting materials
2Ease of manufacture
If light emitting compound concentration is reduced to lower cost, then manufacturing cost decreases, but device performance may deteriorate
Solution Approach 1:
The patent changes the compositional parameters of the light emitting layer by reducing light emitting compound concentration to 5-20% wt and supplementing with hole transporting material. This parameter change maintains device performance by compensating for reduced light emitting compound through enhanced hole transport capability, thus lowering cost without sacrificing performance
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 the compound reduces manufacturing costs significantly without compromising the optoelectronic properties of OLED devices, such as luminance, current density, and external quantum efficiency, while also extending device lifetime.
Implementation Method 1
The compounds of the present invention are much cheaper to manufacture than light emitting compounds such as phosphorescent iridium complexes therefore the cost of manufacturing the devices of the invention is significantly reduced. Moreover it has also been discovered that the incorporation of the compounds of the present invention into the light emitting layer of an OLED does not adversely impact on the lifetime of the device.
Data Source
AI summary
The present invention relates to a compound of general formula (I) which can transport holes in an organic optoelectronic device, and to blends and solutions comprising the compound of general formula (I):whereinX is C, Si or Ge;A is a group of formula (II)wherein Z is N, P, NH, O or S;E is C1-10 alkyl or H;W is substituted or unsubstituted C5-14 aryl or substituted or unsubstituted C6-16 alkyl;e is an integer from 1 to 4; andz is 1 or 2;B, C and D are each independently A, H, C1-C12 alkyl, C5-14 aryl or OH; anda, b, c and d are each independently an integer from 1 to 5.