Organic Light-Emitting Device Boron-Nitrogen Compound
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Solution Overview
Problem
Existing organic light-emitting devices (OLEDs) face challenges in achieving high luminous efficiency and low driving voltage while maintaining excellent luminescence characteristics, due to the complex relationship between the structure of compounds exhibiting multiple resonance effects and their luminescence properties.
Innovation Solution
The development of an organic light-emitting device that incorporates specific compounds represented by formulas (1) and (2), where one of X1 and X2 is a nitrogen atom and the other is a boron atom, combined with specific structural modifications such as pyrrole rings and boron-containing ring structures, to enhance luminescence characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If compounds exhibiting multiple resonance effect are used to improve luminescence characteristics, then light emission with narrow half width and high color purity is achieved, but the relationship between structure and luminescence characteristics remains complex and poorly understood
Solution Approach 1:
The patent systematically varies structural parameters of compounds (such as substituent groups on the boron-nitrogen heterocyclic core) to establish structure-luminescence relationships. By changing parameters like the type of aromatic substituents (phenyl, naphthyl, anthryl groups) and their positions, the inventors optimize both color purity and luminous efficiency while understanding the structure-property relationships.
Solution Approach 2:
The patent employs composite light-emitting layers combining compounds of formula (1) with host materials and dopants. This composite approach allows the active compound to provide high color purity through its multiple resonance structure, while the host material facilitates charge transport and exciton management, resolving the complexity by dividing functional roles.
2Use of energy by moving object
If material combinations are selected to improve luminescence characteristics, then high luminous efficiency is achieved, but driving voltage remains a challenge to optimize simultaneously
Solution Approach 1:
The patent assigns different functional properties to different parts of the device structure. The compound of formula (1) is placed in specific regions (emissive layers) where high color purity is needed, while host materials with appropriate LUMO/HOMO levels are selected for charge transport layers to optimize voltage. This local optimization allows simultaneous achievement of high luminous efficiency and low driving voltage by matching material properties to specific functional requirements.
Solution Approach 2:
The patent optimizes energy level parameters (LUMO and HOMO levels) of both the compound of formula (1) and the host materials to achieve favorable energy alignment. By adjusting these parameters through molecular design and material selection, the device achieves low driving voltage while maintaining high luminous efficiency, resolving the trade-off between these two critical performance parameters.
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 proposed solution achieves high luminous efficiency and low driving voltage for the organic light-emitting device, with improved luminescence characteristics, including excellent orientation and high color purity, making it suitable for display-oriented applications.
Implementation Method 1
thermal activation-type delayed fluorescence is expressed by an inverse intersystem crossing process
Implementation Method 2
a compound that exhibits a multiple resonance effect, such as 5,9-diphenyl-5H,9H-[1,4]benzazaborino[2,3,4-k1]phenazaborine (DABNA-1)
Implementation Method 3
a fluorescence radiation process or an inverse intersystem crossing process which contributes to light emission
Data Source
AI summary
An organic light-emitting device including a compound represented by each of the formulas has excellent luminescence characteristics. One of X1 and X2 is N, and the other is B; R1 to R26, A1, and A2 are H, D, or a substituent; X11 is O, S, etc.; A11 and A12 are benzene rings, furan rings, etc.; R111 to R115 are H, D, aryl, etc.; n is 3 or 4; and L is a single bond, an arylene group, etc.