Polycyclic Boron Compound for OLED Efficiency and Lifetime
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic light emitting devices face challenges in achieving high efficiency and long service life due to exciton annihilation and inefficient energy transfer in the triplet state, particularly in host-dopant systems with small triplet energy-singlet energy values.
Innovation Solution
A compound with a specific structure, including aromatic hydrocarbon rings and boron atoms, is used in the organic material layer to prevent intermolecular interactions, enhance thermal and chemical stability, and facilitate reverse intersystem crossing, thereby improving light emitting efficiency and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a host-dopant system with small triplet energy-singlet energy value is used, then the device efficiency is improved through reverse intersystem crossing, but exciton annihilation occurs and service life is reduced
Solution Approach 1:
The patent introduces a specific compound as an intermediary material in the light-emitting layer that mediates energy transfer between the host and dopant. This compound has a triplet energy-singlet energy value of 0.4 eV or less, enabling efficient reverse intersystem crossing while preventing exciton annihilation, thus resolving the contradiction between improving device efficiency and maintaining service life
Solution Approach 2:
The patent changes the key parameter of triplet energy-singlet energy value to 0.4 eV or less in the compound structure. This parameter optimization enables the material to facilitate reverse intersystem crossing for improved efficiency while simultaneously preventing exciton annihilation, thereby extending service life without sacrificing power conversion efficiency
2Power
If intermolecular interactions are increased to improve energy transfer, then light emitting efficiency is enhanced, but thermal and chemical stability is reduced
Solution Approach 1:
The patent applies local quality by designing a compound structure where aromatic hydrocarbon rings and boron atoms create localized regions with specific properties. The structure prevents unwanted intermolecular interactions while maintaining necessary energy transfer capabilities, achieving both high light emitting efficiency and thermal/chemical stability through localized structural optimization
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 enhances the efficiency and service life of organic light emitting devices by preventing exciton annihilation and promoting efficient energy transfer, leading to improved light emitting performance with a triplet energy-singlet energy value of 0.4 eV or less.
Implementation Method 1
the triplet energy of the compound can be partially harvested as a singlet energy by a reverse intersystem crossing (hereinafter, referred to as 'RISC')
Implementation Method 2
singlet energy of a host is transferred to a dopant in the form of light energy through foster energy transfer
Data Source
AI summary
Provided is a compound of Formula 1:wherein:Cy1 and Cy2 are each independently an aromatic hydrocarbon ring or aromatic hetero ring that is substituted or unsubstituted;R1 to R9 are each independently hydrogen, deuterium, a halogen group, a cyano group, a nitro group, or a substituted or unsubstituted: silyl, alkyl, alkoxy, cycloalkyl, aryl, amine, or heterocyclic group;m1 is 0 to 3, and m2 and m3 are each 0 to 5;when m1 to m3 are each 2 or more, the substituents in the parenthesis are the same or different; andZ1 to Z4 are each independently CH or N, and n1 and n2 are each 0 to 2, and when Z1 to Z4 are each CH, n1+n2 is 2 to 4, and when one or more of Z1 to Z4 are N, n1+n2 is 1 to 4,and an organic light emitting device including the same.