Luminescent Compound for OLED Efficiency and Lifespan
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Solution Overview
Problem
Existing luminescent materials, particularly blue phosphorescent materials, suffer from low luminous efficiency and short lifespan, making them unsuitable for commercial use in organic light emitting diodes (OLEDs).
Innovation Solution
A luminescent compound with a specific structure (Formula 1) is developed, featuring multiple fused rings for rigid conformation, enhancing luminous efficiency and lifespan. This compound is incorporated into the emissive layer of OLEDs, where it acts as a dopant or is used in various layers to improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent material is used to achieve high luminous efficiency, then luminous efficiency is improved, but luminous lifespan deteriorates
Solution Approach 1:
The patent modifies the molecular structure parameters of phosphorescent materials by introducing specific substituents (fluoro, chloro, bromo, iodo groups) and adjusting molecular weight and energy levels to simultaneously improve luminous efficiency and extend lifespan
Solution Approach 2:
The patent creates composite phosphorescent materials combining multiple functional groups and molecular structures to achieve both high luminous efficiency and extended lifespan, overcoming the limitations of single-material systems
2Illumination intensity
If blue luminescent material is used to achieve high color purity, then color purity is improved, but luminous efficiency and lifespan deteriorate
Solution Approach 1:
The patent adjusts energy levels, molecular weights, and substituent types to optimize the balance between color purity and luminous efficiency in blue-emitting materials
Solution Approach 2:
The patent introduces specific local functional groups (carbazole, triphenylene, pyrene units) with distinct photophysical properties to achieve high color purity while maintaining improved luminous efficiency and lifespan
3Device complexity
If fluorescent material is used to simplify device structure, then device complexity is reduced, but luminous efficiency deteriorates
Solution Approach 1:
The patent modifies the photophysical parameters of phosphorescent materials to achieve high luminous efficiency while maintaining relatively simple device structures through optimized material properties
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 luminescent compound significantly improves the luminous efficiency and lifespan of OLEDs, enabling them to operate with reduced driving voltage and maintaining high color purity, thus addressing the limitations of existing blue luminescent materials.
Implementation Method 1
An organic light emitting diode display device (OLED) among a flat display device used widely has come into the spotlight as a display device replacing rapidly a liquid crystal display device (LCD)
Implementation Method 2
a phosphorescent material can show high luminous efficiency since it uses triplet exciton energy as well as singlet exciton energy in the luminous process
Data Source
AI summary
The present disclosure relates to a luminescent compound having the following structure of Formula 1, an organic light emitting diode (OLED) and an organic light emitting device that includes the luminescent compound. The OLED and the organic light emitting device including the luminescent compound can improve their luminous efficiency and luminous lifespan.