Heterocyclic Emission-Layer Compounds for Faster Device Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light-emitting devices face challenges in achieving optimal performance in terms of luminance, driving voltage, and response speed, particularly in the integration of heterocyclic compounds within their structures.
Innovation Solution
Incorporation of a heterocyclic compound represented by Formula 1 into the emission layer of a light-emitting device, along with a layered structure including a first and second electrode, and interlayer components such as hole and electron transport regions, to enhance the device's efficiency and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional materials and structures are used in light-emitting devices, then device stability is maintained, but luminance and response speed performance are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of the emission layer by incorporating heterocyclic compounds with specific structural features (Formula 1 with defined substituents and ring structures), which changes the optical and electrical parameters to achieve higher luminance while maintaining device stability through controlled molecular design
Solution Approach 2:
The patent uses composite material design by combining heterocyclic compounds with specific host materials and dopants in the emission layer, creating a multi-component system that achieves both high luminance performance and device stability through synergistic material interactions
2Speed
If conventional emission materials are used, then device structure is simple, but response speed is insufficient
Solution Approach 1:
The patent optimizes the molecular weight, conjugation length, and substituent parameters of the heterocyclic compounds to achieve faster carrier recombination and exciton decay rates, thereby improving response speed while managing structural complexity through parameter optimization rather than radical structural changes
3Loss of energy
If conventional emission materials are used, then manufacturing is straightforward, but Stokes-shift is too large reducing efficiency
Solution Approach 1:
The patent precisely controls the energy level parameters and molecular rigidity parameters of the heterocyclic compounds to minimize the Stokes-shift by reducing the energy gap between absorption and emission states, achieving higher internal quantum efficiency while maintaining manufacturability through established synthesis routes
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 improves the luminance and response speed of the light-emitting device, reducing the Stokes-shift to less than or equal to about 20 nm, thereby enhancing overall device performance.
Implementation Method 1
Holes provided from the first electrode move toward the emission layer through the hole transport region, and electrons provided from the second electrode move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. The excitons may transition from an excited state to a ground state, thereby generating light.
Data Source
AI summary
Embodiments provide a heterocyclic compound, a light-emitting device including the heterocyclic compound, an electronic apparatus including the light-emitting device, and an electronic apparatus including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode including an emission layer, and the heterocyclic compound. The heterocyclic compound is represented by Formula 1, which is explained in the specification: