OLED Host Compound Combining Hole Blocking and High Efficiency
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Solution Overview
Problem
Existing organic light-emitting devices (OLEDs) face challenges in achieving high luminous efficiency, low driving voltage, and long service life due to the limitations of current organic functional materials, particularly in the selection of host materials and hole/blocking layers.
Innovation Solution
A dibenzoheterocycle organic compound containing imidazo[1,2-a]pyridine is developed, offering higher glass transition temperature and improved optical, electric, and thermal stability, which is used as a host material and/or hole blocking material in OLED devices to enhance luminous efficiency and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent materials are used to improve luminous efficiency, then luminous efficiency is improved, but device complexity increases due to the need for host material matching and additional functional layers
Solution Approach 1:
The dibenzoheterocycle organic compound containing imidazo[1,2-a]pyridine is designed to perform multiple functions simultaneously: it serves as both the host material and the hole blocking layer material in OLED devices. This multi-functionality eliminates the need for separate host material and hole blocking layer, thereby reducing device complexity while maintaining high luminous efficiency through phosphorescent material utilization
Solution Approach 2:
The patent combines the host material function and hole blocking layer function into a single organic compound. This merging of functions simplifies the device structure by reducing the number of distinct material layers required, while still achieving the benefits of phosphorescent emission through proper host-guest complex formation
2Device complexity
If conventional organic functional materials are used, then device structure is simple, but luminous efficiency, driving voltage, and service life are insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of organic functional materials by introducing dibenzoheterocycle and imidazo[1,2-a]pyridine moieties. These structural parameter changes result in improved thermal stability, glass transition temperature, and electrochemical properties, thereby enhancing device performance including luminous efficiency, driving voltage, and service life while maintaining structural simplicity
3Device complexity
If fluorescent materials are used, then device structure is simple, but luminous efficiency is limited due to utilization of only 25% singlet state
Solution Approach 1:
The patent employs a composite material system where the dibenzoheterocycle organic compound containing imidazo[1,2-a]pyridine serves as the host material that can effectively support phosphorescent guest materials. This composite approach enables utilization of both singlet and triplet exciton states through phosphorescent emission, achieving high luminous efficiency while maintaining relatively simple device structure through the compound's inherent hole blocking capability
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 compound provides superior performance in OLED devices by reducing energy consumption, improving exciton diffusion, and extending device life, with lower starting voltage and higher luminous efficiency.
Implementation Method 1
the compound of the present invention is beneficial to reducing the diffusion of excitons and promoting the luminous efficiency of the device when used as a hole blocking layer
Implementation Method 2
Driven by electric current, holes and electrons are injected from cathode and anode respectively, and then compounded on a light-emitting layer after moving a certain distance, then released in a form of light or heat, thus producing the light emission of OLED
Data Source
AI summary
The present invention relates to a compound and an organic light-emitting device containing the compound. The compound has a structure as shown in Formula (1), where X is selected from the group consisting of: O, S, Se, CR3R4, SiR5R6, GeR7R8 and BR9. The compound can be used in organic light-emitting devices, particularly as a host material or a hole blocking layer material in an emitting layer of a device or both as the host material and hole blocking layer material simultaneously. Moreover, the compound can provide a higher luminous efficiency for a device, especially has the advantages such as a longer service life of a device, and has the possibility to be applied to the AMOLED industry.