Compressed Organic EL Pellet for Uniform Co-Deposition
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Solution Overview
Problem
Existing organic electroluminescent (EL) devices face challenges in achieving high efficiency and long lifespan due to difficulties in precise deposition of organic compounds, which often result in material waste and electrostatic handling issues.
Innovation Solution
A pellet is developed comprising two or more types of organic compound powders, compressed without heat treatment, with alternating regions of different organic compounds to maintain consistent emission wavelength and reduce surface resistance, allowing for uniform thin film formation and easy handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple organic compounds are evaporated individually to form the organic layer, then the performance of the organic EL device can be improved, but the deposition rate control becomes difficult and material utilization efficiency decreases
Solution Approach 1:
The patent combines multiple organic compounds into a single pellet form that can be deposited as a unified layer. The pellet contains host material and dopant in predetermined ratios, allowing simultaneous deposition of multiple compounds through a single evaporation process, thereby improving material utilization while maintaining device performance
Solution Approach 2:
The organic compounds are pre-mixed and compressed into a pellet with precise composition ratios before deposition. This preliminary preparation ensures that the correct stoichiometric ratios of host and dopant materials are maintained throughout the deposition process, eliminating the need for separate deposition steps while ensuring optimal device performance
2Ease of manufacture
If organic compound powders are handled during deposition, then the organic layer can be formed, but electrostatic charging occurs and handling becomes difficult
Solution Approach 1:
Multiple organic compound powders are compressed into a single pellet, eliminating the need to handle separate powder materials. The pellet form factor simplifies loading and handling during deposition while preventing electrostatic charging issues associated with loose powders
Solution Approach 2:
The patent changes the physical state of organic compounds from loose powders to a compressed pellet form. This parameter change in physical form maintains the ability to form organic layers while eliminating electrostatic charging problems and handling difficulties associated with powdered materials
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 pellet provides excellent thermal and chemical stability, low surface resistance, and reproducible thin film deposition, resulting in high-efficiency and long-lifespan organic EL devices.
Implementation Method 1
The organic layer is formed by evaporating each of the organic compounds individually
Implementation Method 2
both the first and second organic compound powders may be sublimable powders
Data Source
AI summary
A pellet for an organic electroluminescent device and an organic electroluminescent device using the pellet are disclosed. The pellet for an organic electroluminescent device contains two or more types of organic compound powders, including a first organic compound powder and a second organic compound powder that have been compressed, wherein the pellet has the same maximum emission wavelength as the organic compound with a longer emission wavelength among the first organic compound and second organic compound.