Polycyclic Compound Light Emitting Element Lifespan Efficiency
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high luminous efficiency, and long lifespan for light emitting elements.
Innovation Solution
A light emitting element is designed with a polycyclic compound in the emission layer, incorporating specific compounds represented by Formulas 1, HT-1, ET-1, and M-b, which form functional layers to enhance the element's lifespan and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional organic electroluminescence materials are used, then the light emitting element can be manufactured, but the lifespan is short
Solution Approach 1:
The patent modifies the molecular structure of organic electroluminescence materials by changing chemical parameters - specifically incorporating polycyclic compounds with fused ring structures and adjusting molecular weight and purity parameters to achieve enhanced stability and lifespan
Solution Approach 2:
The patent uses composite material strategies by combining multiple functional layers with different materials (hole transport layer, emission layer, electron transport layer) where each layer is optimized for specific functions, creating a synergistic effect that improves overall device lifespan and reliability
2Loss of energy
If conventional materials are used, then the device can operate, but luminous efficiency is low
Solution Approach 1:
The patent optimizes energy conversion by changing material parameters - using polycyclic compounds with specific HOMO-LUMO energy gaps and adjusting the molecular structure to reduce non-radiative recombination losses and enhance radiative transitions
Solution Approach 2:
The patent converts harmful non-radiative recombination processes into beneficial radiative emission by carefully designing the energy levels and molecular structures of the materials, turning energy losses into useful light output
3Power
If conventional materials are used, then the device can function, but driving voltage is high
Solution Approach 1:
The patent reduces driving voltage by changing the electrical parameters of the materials - specifically adjusting HOMO levels, LUMO levels, and charge transport characteristics to enable lower operating voltages while maintaining efficient charge injection and transport
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 solution results in a light emitting element with improved lifespan and luminous efficiency, emitting light with a maximum wavelength of 430 nm to 490 nm, effectively addressing the challenges of existing technologies.
Implementation Method 1
organic electroluminescence display devices and/or the like are display devices including self-luminescent light emitting elements in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and thus a luminescent material in the emission layer emits light
Data Source
AI summary
A light emitting element including: a first electrode; a second electrode facing the first electrode; and at least one functional layer between the first electrode and the second electrode is provided. The at least one functional layer includes: a first compound represented by Formula 1; and at least one of a second compound represented by Formula HT-1, a third compound represented by Formula ET-1, or a fourth compound represented by Formula M-b.