Condensed Cyclic Compound Emission Layers for Efficient, Stable OLEDs
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in achieving high light efficiency and stability, particularly in maintaining the structure and resonance properties of the emission layer compounds.
Innovation Solution
Incorporation of a condensed cyclic compound represented by Formula 1 in the emission layer, which includes a hole transport region and a second capping layer with a refractive index of 1.6 or greater, enhances light extraction efficiency and stability by maintaining a trigonal planar structure and reducing structural deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic light-emitting devices are used, then device structure and resonance properties can be maintained, but light efficiency and stability are insufficient
Solution Approach 1:
The patent introduces a condensed cyclic compound with specific molecular structure parameters (Formula 1) featuring non-benzene rings (CY3, CY6) and specific substituents (R0-R6, a0-a6) to change the optical and electronic properties of the emission layer, thereby improving both stability and light efficiency simultaneously
Solution Approach 2:
The patent combines the condensed cyclic compound (Formula 1) with hole transport compounds (Formulae 201, 202) and electron transport compounds in a multi-layer emission layer structure, creating a composite material system that achieves synergistic effects for enhanced stability and light efficiency
2Loss of energy
If light extraction efficiency is improved, then light efficiency increases, but structural stability may deteriorate
Solution Approach 1:
The patent applies different structural characteristics to different parts of the emission layer: the condensed cyclic compound (Formula 1) provides structural stability through its rigid molecular framework, while the hole transport region (Formulae 201, 202) and electron transport region optimize light extraction through their specific optical properties
Solution Approach 2:
The condensed cyclic compound acts as an intermediary material that mediates between the electrodes and the emission layer, facilitating both stable charge transport and efficient light extraction through its unique molecular structure with non-benzene rings
3Use of energy by stationary object
If driving voltage is reduced, then energy consumption decreases, but light efficiency may be compromised
Solution Approach 1:
The patent changes the HOMO-LUMO energy level parameters of the emission layer materials by introducing the condensed cyclic compound with specific substituents, enabling lower driving voltage while maintaining high light efficiency through optimized energy level alignment
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 use of the condensed cyclic compound improves light efficiency and extends the lifespan of the organic light-emitting device by reducing the stokes shift and increasing resonance, resulting in a low driving voltage and enhanced light extraction.
Implementation Method 1
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state to thereby generate light.
Implementation Method 2
improves light efficiency and extends the lifespan of the organic light-emitting device by reducing the stokes shift and increasing resonance
Implementation Method 3
a second capping layer outside the second electrode and having a refractive index of equal to or greater than 1.6
Data Source
AI summary
A light-emitting device including a condensed cyclic compound and an electronic apparatus including the light-emitting device are provided. The light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode, wherein the interlayer further includes a hole transport region between the first electrode and the emission layer, the hole transport region includes a compound represented by Formula 201, a compound represented by Formula 202, or any combination thereof, and the emission layer includes at least one condensed cyclic compound represented by Formula 1:The substituents are as defined in the detailed description.