OLED Host Mixture Composition for Stable Single-Source Evaporation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescent devices face challenges in achieving high efficiency, saturated emitting colors, and prolonged device lifetime, particularly in blue phosphorescent devices, with a need for improved material combinations and evaporation stability.
Innovation Solution
A novel mixture comprising three or more compounds, including at least one hole transport-type compound with an arylamino group, is used as a host material in an organic electroluminescent device, ensuring high evaporation stability and simplifying the production process by acting as a single evaporation source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single compound is used as host material in OLED, then device structure is simple, but evaporation stability is poor and device lifetime is short
Solution Approach 1:
The patent employs composite materials by combining three or more compounds with different functions (hole transport, electron transport, and emission) into a single host material mixture. This composite approach improves evaporation stability and device lifetime while maintaining structural simplicity in the OLED device architecture.
Solution Approach 2:
The patent merges multiple functional compounds into a single evaporation source, where the mixture of hole transport-type, electron transport-type, and emission compounds is deposited together in one step. This combining approach achieves both improved reliability through better evaporation stability and simplified device structure.
2Ease of manufacture
If multiple separate evaporation sources are used, then material selection flexibility is high, but production process complexity increases
Solution Approach 1:
The patent combines multiple material deposition steps into a single evaporation process by preparing a mixture of host materials that includes hole transport-type, electron transport-type, and emission compounds. This single evaporation source approach simplifies the production process while maintaining the ability to achieve diverse material combinations for optimized device performance.
Solution Approach 2:
The patent performs preliminary mixing of the host material components before evaporation, creating a pre-formed mixture that contains all necessary compounds in specific ratios. This preliminary action ensures that the materials are already optimally combined before deposition, simplifying the subsequent evaporation process while maintaining material selection flexibility.
3Loss of energy
If fluorescent OLED is used, then device structure is simple, but internal quantum efficiency is limited to 25%
Solution Approach 1:
The patent changes the emission mechanism parameter from pure fluorescent emission to phosphorescent emission by incorporating phosphorescent emission-type compounds into the host material mixture. This parameter change enables triplet excitons to be harvested through phosphorescent emission, achieving internal quantum efficiency exceeding 25% while maintaining reasonable device structure complexity.
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 novel mixture enhances device performance by improving evaporation stability and reducing production costs while achieving better overall performance in organic electroluminescent devices.
Implementation Method 1
an organic electroluminescent device, and an electronic device comprising the electroluminescent device
Implementation Method 2
the first compound is a hole transport-type compound, the second compound is an electron transport-type compound
Implementation Method 3
the second compound is an electron transport-type compound
Data Source
AI summary
Provided are a mixture and composition comprising an arylamino compound, an organic electroluminescent device and an electronic device thereof. The mixture, composition, organic electroluminescent device and electronic device comprise three or more compounds, one of which contains an arylamino group. The mixture and the composition can each be used as a host material in the organic electroluminescent device so that the electroluminescent device can obtain good overall performance, such as relatively high efficiency and a relatively long lifetime. In particular, the mixture has high evaporation stability and can be used as a single evaporation source in a preparation process of an OLED device, which can simplify a production process and reduce a production cost.