Benzofuro[3,2-d]pyrimidine Host Material for OLED Efficiency
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Solution Overview
Problem
Current light-emitting elements face challenges in achieving high emission efficiency, long lifetime, low driving voltage, and high reliability, particularly in phosphorescent elements, where the properties of host materials significantly impact performance.
Innovation Solution
Development of a novel organic compound with a benzofuro[3,2-d]pyrimidine or benzothieno[3,2-d]pyrimidine skeleton, which acts as a host material, enabling efficient exciplex-triplet energy transfer and providing a high triplet excitation energy level and low unoccupied molecular orbital level, thus enhancing emission efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional host materials are used in phosphorescent light-emitting elements, then the elements can achieve higher emission efficiency than fluorescent elements, but the lifetime and reliability remain insufficient
Solution Approach 1:
The patent modifies the molecular structure of host materials by introducing specific heteroaromatic ring systems (benzofuro[3,2-d]pyrimidine and benzothieno[3,2-d]pyrimidine) with tailored electronic properties. These structural changes optimize the triplet energy level and LUMO level parameters, enabling simultaneous achievement of high emission efficiency and extended element lifetime through improved electron transport and reduced degradation pathways
Solution Approach 2:
The invention develops composite host material systems combining organic compounds with specific heteroaromatic skeletons. These composite materials integrate multiple functional characteristics: high triplet energy for phosphorescent operation, appropriate LUMO levels for electron transport, and enhanced thermal stability. The composite approach allows optimization of both emission efficiency and reliability through synergistic material properties
2Loss of energy
If host material properties are optimized for high emission efficiency, then phosphorescent light-emitting elements achieve better performance, but the driving voltage increases
Solution Approach 1:
The patent carefully balances multiple energy parameters of the host material. By optimizing the LUMO level to be appropriately low while maintaining high triplet energy, the material facilitates efficient electron injection and transport at reduced voltages. The molecular structure is designed to achieve optimal energy level alignment between host and guest materials, enabling high emission efficiency without excessive driving voltage requirements
3Reliability
If new host material structures are developed to improve reliability, then element lifetime increases, but the emission efficiency may decrease
Solution Approach 1:
The patent achieves simultaneous optimization of reliability and emission efficiency through precise control of molecular structure parameters. The heteroaromatic ring systems are designed with specific electronic configurations that provide both high thermal stability (extending lifetime) and appropriate triplet energy levels (maintaining emission efficiency). The structural modifications include introducing electron-withdrawing groups and optimizing conjugation length to balance stability and optoelectronic performance
Solution Approach 2:
The invention creates composite host materials that integrate multiple functional moieties: heteroaromatic rings for stability, electron-transport groups for efficiency, and appropriate substituents for energy level tuning. This composite structure allows the material to simultaneously exhibit high thermal stability for extended lifetime and optimized electronic properties for high emission efficiency in phosphorescent devices
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 organic compound allows for high emission efficiency, low driving voltage, and increased reliability in light-emitting elements by optimizing the energy transfer mechanisms and electron transport properties, leading to improved performance in both phosphorescent and fluorescent light-emitting elements.
Implementation Method 1
phosphorescent light-emitting elements achieve higher emission efficiency than fluorescent light-emitting elements
Implementation Method 2
enabling efficient exciplex-triplet energy transfer
Implementation Method 3
providing a high triplet excitation energy level and low unoccupied molecular orbital level, thus enhancing emission efficiency and reliability
Data Source
AI summary
A novel compound is provided. A light-emitting element with high emission efficiency and a long lifetime is provided. The compound is an organic compound that includes a benzofuro[3,2-d]pyrimidine or benzothieno[3,2-d]pyrimidine skeleton (General Formula (G0)). The 2-position of the benzofuro[3,2-d]pyrimidine or benzothieno[3,2-d]pyrimidine skeleton has a substituent and the 6- to 9-positions of the skeleton have at least one substituent. Any one of the substituents bonded to the 6- to 9-positions is bonded to the benzofuro[3,2-d]pyrimidine or benzothieno[3,2-d]pyrimidine skeleton via a phenylene group. A light-emitting element including the compound is provided.