Condensed Cyclic Compound Emission Layer for Light Emitting Devices
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Solution Overview
Problem
Existing light emitting devices for display applications face challenges in achieving low driving voltage, high luminous efficiency, and long service life, which are essential for efficient and durable display technology.
Innovation Solution
A light emitting device is designed with a novel condensed cyclic compound in the emission layer, along with specific electrode materials and a capping layer with a refractive index of about 1.6 or more, to enhance luminous efficiency and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials and structures are used in light emitting devices, then device complexity is low, but luminous efficiency and service life are insufficient
Solution Approach 1:
The patent applies parameter changes by introducing a capping layer with specifically controlled refractive index (1.6 or more) and designing the emission layer with particular thickness ranges (50-200 nm). These parameter optimizations resolve the contradiction by achieving enhanced service life and luminous efficiency through precise physical parameter control rather than complex structural modifications.
Solution Approach 2:
The patent employs composite materials by combining the capping layer with specific refractive index properties and the emission layer containing condensed cyclic compounds with particular molecular structures. This composite approach improves reliability and luminous efficiency through material composition optimization while maintaining relatively simple device architecture.
2Use of energy by moving object
If conventional emission layers are used, then manufacturing is simple, but luminous efficiency is insufficient
Solution Approach 1:
The patent achieves improved luminous efficiency through parameter changes in the emission layer, specifically using condensed cyclic compounds with defined molecular structures (Formula 1) and controlling layer thickness within 50-200 nm. These parameter optimizations enhance energy conversion efficiency while maintaining compatibility with existing manufacturing processes.
Solution Approach 2:
The patent applies local quality by introducing a capping layer with specifically engineered refractive index (1.6 or more) at the device interface. This localized material property enhancement optimizes light extraction and luminous efficiency at the critical emission interface without requiring complex modifications throughout the entire device structure.
3Power
If standard electrode materials are used, then ease of manufacture is high, but driving voltage is not sufficiently low
Solution Approach 1:
The patent reduces driving voltage through parameter changes in electrode material selection, specifying particular metals (Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca) and their compounds or mixtures. These material parameter optimizations lower the energy barrier for charge injection while maintaining ease of manufacture through compatibility with conventional vacuum deposition and other standard fabrication techniques.
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 light emitting device exhibits improved luminous efficiency and extended service life, effectively addressing the limitations of existing technologies while maintaining efficient operation.
Implementation Method 1
The organic electroluminescence display includes a so-called self-luminescent light emitting device in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and thus a luminescent material of the emission layer emits light
Implementation Method 2
a capping layer which is on the second electrode and has a refractive index of about 1.6 or more
Data Source
AI summary
Provided is a light emitting device including a first electrode, a second electrode, and an emission layer between the first electrode and the second electrode, and the emission layer may include a condensed cyclic compound represented by Formula 1 below, thereby exhibiting high luminous efficiency and improved service life characteristics.