Heterocyclic Compound Emission Layer for Light-Emitting Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current light-emitting devices face limitations in achieving high luminescence efficiency, low driving voltage, and long lifespan due to inadequate charge transport and stability in their emission layers.
Innovation Solution
Incorporation of a heterocyclic compound represented by Formula 1, which includes a 5-membered to 10-membered saturated cyclic group, into the light-emitting device's interlayer, enhancing charge transport and stability, thereby improving luminescence efficiency and device lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional emission layers are used in light-emitting devices, then device structure is simple, but luminescence efficiency is insufficient and lifespan is limited
Solution Approach 1:
The emission layer uses a composite system consisting of a host compound and a heterocyclic compound (Formula 1). The host compound provides structural framework while the heterocyclic compound acts as dopant to enhance charge transport and luminescence efficiency. This composite approach allows achieving high luminescence efficiency without significantly complicating the device structure.
Solution Approach 2:
The heterocyclic compound is specifically designed with local functional groups: a 5-membered to 10-membered saturated cyclic group for stability, heterocyclic rings for charge transport, and adjustable substituent groups (R1-R10) for optimizing luminescence properties. This local quality optimization enables tailored performance enhancement in specific regions of the emission layer.
2Productivity
If emission layers with adequate charge transport are used, then luminescence efficiency improves, but driving voltage increases
Solution Approach 1:
The heterocyclic compound employs adjustable parameters including the type of saturated cyclic group (5-10 membered rings), the specific heterocyclic rings (ring CY2-CY5), and substituent groups (R1-R10). By optimizing these parameters, the compound achieves balanced charge transport capability and appropriate energy levels that facilitate efficient carrier recombination at lower driving voltages.
Solution Approach 2:
The patent provides numerous specific embodiments (Compounds 1-147) that replicate the successful structural pattern of Formula 1 with varying substituents. These copied structures have been optimized to achieve the desired balance between charge transport and driving voltage through systematic variation of R1-R10 groups while maintaining the core heterocyclic framework.
3Duration of action of stationary object
If emission layers with enhanced stability are used, then device lifespan extends, but charge transport capability may be reduced
Solution Approach 1:
The heterocyclic compound incorporates specific local structural features: the 5-membered to 10-membered saturated cyclic group (ring CY1) provides steric bulk and structural stability to prevent degradation, while the heterocyclic rings (ring CY2-CY5) with appropriate π-conjugation maintain charge transport pathways. The local quality of each structural element is optimized to fulfill its specific function without compromising the other.
Solution Approach 2:
The compound combines stabilizing saturated cyclic groups with charge-transporting heterocyclic rings in a single molecular structure. This intramolecular composite design ensures that stability and charge transport capabilities are integrated at the molecular level, allowing the emission layer to maintain both properties simultaneously during device operation.
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 heterocyclic compound in the light-emitting device leads to improved luminescence efficiency, reduced driving voltage, and extended lifespan by stabilizing the emission layer and enhancing charge transport.
Implementation Method 1
enhancing charge transport and stability, thereby improving luminescence efficiency and device lifespan
Implementation Method 2
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 3
reduced driving voltage, and extended lifespan by stabilizing the emission layer and enhancing charge transport
Data Source
AI summary
A light-emitting device is provided and including a heterocyclic compound represented by Formula 1, and an electronic apparatus including the light-emitting device:Formula 1 may be understood by referring to the description of Formula 1 provided herein.