Metered Vaporization for OLED Material Delivery
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Solution Overview
Problem
Existing physical vapor deposition methods for OLED manufacturing face challenges such as material degradation due to high temperatures, low deposition rates, and limitations in mixing organic materials like dopants with host materials, leading to inefficient throughput and unreliable film deposition.
Innovation Solution
An apparatus for vaporizing powdered or granular materials using a container with a positive displacement mechanism and vibratory diaphragm to control the delivery of material to a thermally isolated vaporization zone, allowing for continuous, controlled, and metered vaporization with reduced heating of organic materials, enabling co-vaporization of materials with different vaporization rates and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small quantities of organic materials are loaded in sources and heated as little as possible, then material degradation is reduced, but the available vaporization rate is very low and operation time is very short
Solution Approach 1:
The source is divided into two distinct zones: a storage container that remains cool and a vaporization zone that is heated. Material is segmented between these zones, with only a small portion in the vaporization zone at any time, allowing high vaporization rates without degrading the bulk material.
Solution Approach 2:
A positive displacement mechanism acts as an intermediary between the cool storage container and the heated vaporization zone. This mechanism meters and transports material from the storage zone to the vaporization zone, controlling the rate of material delivery to achieve high vaporization rates while protecting the bulk material from thermal degradation.
2Productivity
If the entire organic material charge is heated to the same temperature, then vaporization occurs, but it is impractical to mix additional organic materials like dopants with host material unless their vaporization behavior is very close
Solution Approach 1:
Multiple materials are segmented into separate storage containers within the source, each kept at different temperatures optimized for that specific material's vaporization characteristics. This allows materials with different vaporization rates (such as host and dopant materials) to be vaporized simultaneously at their respective optimal temperatures without mutual interference.
Solution Approach 2:
The system dynamically controls the temperature of each storage container and the metering rate of each material independently. This dynamic control allows optimization of vaporization rates for each material type while maintaining the ability to mix materials with vastly different thermal properties in the deposited film.
3Reliability
If multiple separate sources are used to co-deposit host and dopant materials, then material-specific vaporization is achieved, but the number of sources increases chamber size and complexity
Solution Approach 1:
Multiple storage containers with different materials are merged into a single integrated source assembly with a common vaporization zone. The positive displacement mechanism merges the delivery of multiple materials into one coordinated system, allowing co-deposition of host and dopant materials from a single source location rather than requiring multiple separate sources arrayed in the chamber.
Solution Approach 2:
The single source assembly performs multiple functions: it stores multiple different materials, controls their individual metering rates, maintains different storage temperatures for each material, and delivers them all to a common vaporization zone. This multi-functional design replaces what would otherwise require multiple separate single-function sources.
4Quantity of substance
If frequent venting and source recharging is performed, then material consumption is managed, but throughput is substantially limited
Solution Approach 1:
The positive displacement mechanism enables continuous metered delivery of material from the storage container to the vaporization zone throughout the entire operation. This continuous action eliminates the need to stop and recharge sources, as the system can operate continuously with the large material capacity of the cool storage container feeding the vaporization zone.
Solution Approach 2:
Large quantities of material are pre-loaded into the storage container in a preliminary action that occurs outside the vacuum chamber (or in a separate loading cycle). This preliminary loading prepares a substantial material reservoir that can then support extended continuous operation without requiring frequent interruptions for recharging, thereby improving manufacturing throughput.
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
This solution achieves higher vaporization rates with reduced material degradation, allows for precise control of vaporization rates, and enables the co-deposition of multiple materials without heater temperature changes, improving manufacturing efficiency and reducing the risk of contamination.
Implementation Method 1
a positive displacement mechanism spaced from the vaporization structure defining a chamber for receiving powdered or granular material from the container, and delivering such powdered or granular material to the vaporization structure
Implementation Method 2
a vibratory diaphragm for fluidizing material in the chamber between the actuable member and the orifice
Implementation Method 3
material is heated to a temperature causing rapid vaporization, and create a vapor plume that condenses to form a thin film on a surface of a substrate
Implementation Method 4
material is heated to a temperature causing rapid vaporization, and create a vapor plume that condenses to form a thin film on a surface of a substrate
Data Source
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AI summary
Apparatus for vaporization of powdered or granular material, includes a container for holding powdered or granular material having at least one component; a vaporization structure; and a positive displacement mechanism spaced from the vaporization structure defining a chamber for receiving powdered or granular material from the container, and delivering such powdered or granular material to the vaporization structure, the positive displacement mechanism defining an orifice for delivering powdered or granular material from the chamber to the vaporization structure, an actuable member movable in first and section directions into the orifice and back from the orifice to be spaced therefrom for driving powdered or granular material from the chamber through the orifice for delivery to the vaporization structure and a vibratory diaphragm for fluidized material in the chamber between the actuable member and the orifice.